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Antipova V, Siwetz M, Engelhardt M, Fellner FA, Manhal S, Niedermair JF, Ondruschka B, Pietras SM, Poilliot AJ, Pretterklieber ML, Wimmer-Röll M, Wree A, Hammer N. A comparison of 1- versus 3-month regional anatomy exposure on learning outcomes of undergraduate medical students. Clin Anat 2024. [PMID: 39101524 DOI: 10.1002/ca.24206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 07/02/2024] [Accepted: 07/16/2024] [Indexed: 08/06/2024]
Abstract
Regional anatomy teaching forms a cornerstone of undergraduate medical education. Owing to an increase in teaching and learning content throughout the medical curriculum in recent years, contact hours and overall course durations in anatomy are under review worldwide. This study aimed to assess whether shortening the course content duration impacts learning gain and the ability to identify anatomical structures correctly. Undergraduate medical students of the Johannes Kepler University Linz (JKU; n = 310) and at the Medical University of Graz (MUG; n = 156) participating in regional anatomy courses were included. Whole body regional anatomy courses, including hands-on dissection and accompanying lectures, were delivered over one or three months. Course content and examination mode were kept consistent, while the duration of knowledge delivery was one or three months, respectively. Objective structured practical examinations (OSPE) were then carried out on prosections for the neck, thorax, and abdomen. 3-month course exposure resulted in significantly higher OSPE scores for the neck (49 vs. 37%), thorax (65 vs. 54%), and abdomen (65 vs. 45%), respectively. Further evaluation of the utility of different embalming types yielded higher 3-month scores in the neck and thorax regions with Thiel-embalmed tissues and thorax and abdomen regions in ethanol-glycerin-embalmed tissues. Course exposure over a more extended period, like three months, appears to be highly beneficial.
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Affiliation(s)
- Veronica Antipova
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Martin Siwetz
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Maren Engelhardt
- Institute of Anatomy and Cell Biology, Johannes Kepler University, Linz, Austria
| | - Franz A Fellner
- Central Radiology Institute, Johannes Kepler University Hospital, Linz, Austria
- Division of Virtual Morphology, Institute of Anatomy and Cell Biology, Johannes Kepler University, Linz, Austria
| | - Simone Manhal
- Office of the Vice-Rector for Studies and Teaching, Medical University of Graz, Graz, Austria
| | - Julian F Niedermair
- Central Radiology Institute, Johannes Kepler University Hospital, Linz, Austria
- Division of Virtual Morphology, Institute of Anatomy and Cell Biology, Johannes Kepler University, Linz, Austria
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sandra M Pietras
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | | | - Michael L Pretterklieber
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Monika Wimmer-Röll
- Institute of Anatomy and Cell Biology, Johannes Kepler University, Linz, Austria
| | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, Rostock, Germany
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
- Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany
- Division of Biomechatronics, Fraunhofer Institute for Machine Tools and Forming Technology (IWU), Chemnitz and Dresden, Germany
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Orellana F, Grassi A, Hlushchuk R, Wahl P, Nuss KM, Neels A, Zaffagnini S, Parrilli A. Revealing the complexity of meniscus microvasculature through 3D visualization and analysis. Sci Rep 2024; 14:10875. [PMID: 38740845 DOI: 10.1038/s41598-024-61497-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 05/07/2024] [Indexed: 05/16/2024] Open
Abstract
Three-dimensional information is essential for a proper understanding of the healing potential of the menisci and their overall role in the knee joint. However, to date, the study of meniscal vascularity has relied primarily on two-dimensional imaging techniques. Here we present a method to elucidate the intricate 3D meniscal vascular network, revealing its spatial arrangement, connectivity and density. A polymerizing contrast agent was injected into the femoral artery of human cadaver legs, and the meniscal microvasculature was examined using micro-computed tomography at different levels of detail and resolution. The 3D vascular network was quantitatively assessed in a zone-base analysis using parameters such as diameter, length, tortuosity, and branching patterns. The results of this study revealed distinct vascular patterns within the meniscus, with the highest vascular volume found in the outer perimeniscal zone. Variations in vascular parameters were found between the different circumferential and radial meniscal zones. Moreover, through state-of-the-art 3D visualization using micro-CT, this study highlighted the importance of spatial resolution in accurately characterizing the vascular network. These findings, both from this study and from future research using this technique, improve our understanding of microvascular distribution, which may lead to improved therapeutic strategies.
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Affiliation(s)
- Federica Orellana
- Center for X-Ray Analytics, Empa-Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland
- Department of Chemistry, University of Fribourg, 1700, Fribourg, Switzerland
| | - Alberto Grassi
- IRCCS-Rizzoli Orthopaedic Institute, 40136, Bologna, Italy
| | - Ruslan Hlushchuk
- Faculty of Medicine, University of Bern, 3012, Bern, Switzerland
| | - Peter Wahl
- Faculty of Medicine, University of Bern, 3012, Bern, Switzerland
- Cantonal Hospital Winterthur, 8401, Winterthur, Switzerland
| | - Katja M Nuss
- Vetsuisse Faculty, University of Zurich, 8057, Zurich, Switzerland
| | - Antonia Neels
- Center for X-Ray Analytics, Empa-Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland
- Department of Chemistry, University of Fribourg, 1700, Fribourg, Switzerland
| | | | - Annapaola Parrilli
- Center for X-Ray Analytics, Empa-Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland.
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Siwetz M, Widni-Pajank H, Hammer N, Bruneder S, Wree A, Antipova V. Course and Relation of the Facial Vessels-An Anatomical Study. MEDICINA (KAUNAS, LITHUANIA) 2024; 60:805. [PMID: 38792988 PMCID: PMC11123074 DOI: 10.3390/medicina60050805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 05/09/2024] [Accepted: 05/11/2024] [Indexed: 05/26/2024]
Abstract
Background and Objectives: Facial vascular anatomy plays a pivotal role in both physiological context and in surgical intervention. While data exist on the individual course of the facial artery and vein, to date, the spatial relationship of the vasculature has been ill studied. The aim of this study was to assess the course of facial arteries, veins and branches one relative to another. Materials and Methods: In a total of 90 halved viscerocrania, the facial vessels were injected with colored latex. Dissection was carried out, the relation of the facial vessels was studied, and the distance at the lower margin of the mandible was measured. Furthermore, branches including the labial and angular vessels were assessed. Results: At the base of the mandible, the facial artery was located anterior to the facial vein in all cases at a mean distance of 6.2 mm (range 0-15 mm), with three cases of both vessels adjacent. An angular vein was present in all cases, while an angular artery was only present in 34.4% of cases. Conclusions: The main trunk of the facial artery and vein yields a rather independent course, with the facial artery always located anterior to the vein, while their branches, especially the labial vessels, demonstrate a closer relationship.
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Affiliation(s)
- Martin Siwetz
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria; (M.S.); (H.W.-P.)
| | - Hannes Widni-Pajank
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria; (M.S.); (H.W.-P.)
- Department of Oral and Maxillofacial Surgery, Klagenfurt Am Wörthersee Clinic, Feschnigstraße 11, A-9020 Klagenfurt am Wörthersee, Austria
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria; (M.S.); (H.W.-P.)
- Department of Orthopedic and Trauma Surgery, University of Leipzig, D-04103 Leipzig, Germany
- Division of Biomechatronics, Fraunhofer Institute for Machine Tools and Forming Technology Dresden, D-09126 Dresden, Germany
| | - Simon Bruneder
- Department of Oral and Maxillofacial Surgery, Medical University of Graz, Auenbruggerplatz 5, A-8036 Graz, Austria;
| | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstr. 9, D-18057 Rostock, Germany;
| | - Veronica Antipova
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria; (M.S.); (H.W.-P.)
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Demiraslan Y, Gürbüz İ, Özbek M, Şahan Yapicier Ö, Karaca H, Özgel Ö, Öner H. Cadaver preservative properties of a solution composed of honey, ethyl alcohol, liquid paraffin, distilled water and citric acid: Experiments on rabbit cadavers. Anat Histol Embryol 2024; 53:e13032. [PMID: 38525664 DOI: 10.1111/ahe.13032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/04/2024] [Accepted: 03/12/2024] [Indexed: 03/26/2024]
Abstract
The objective of this study is to assess the efficacy of a solution including honey, ethyl alcohol, liquid paraffin, distilled water and citric acid (HEFS) as a preservative for rabbit cadavers, serving as a potential substitute for formaldehyde. The cadavers underwent preservation using three distinct solutions: 10% formalin, 35% alcohol and HEFS. The cadavers were subjected to a total of four sampling events, occurring at 4-month intervals, in order to collect specimens for microanatomical, histological, microbiological, mycological, colourimetric, texture and odour analysis. In terms of hardness, suitability for dissection and joint mobility metrics, the cadavers fixed with HEFS had superior qualities to those fixed with formalin. The fixation quality of HEFS for histological analyses was deemed acceptable, except kidney and intestinal tissues. In texture analysis, differences only in the elasticity parameter (p < 0.05) in the same sampling period. A total of 10 (13.9) bacteria isolates were identified among which, Metasolibacillus meyeri 3 (30%) was predominantly followed by Staphylococcus aureus 2 (20%), Bacillus siamensis, Bacillus subtilis, Pseudarthrobacter oxydans, Bacillus licheniformis, Bacillus subtilis subsp. subtilis with a proportion of 1 (10%), respectively, by both microbiological and molecular analysis. However, no anaerobic bacteria and fungi were isolated. A considerable percentage of the students had the perception that HEFS was appropriate for utilization in laboratory settings due to its absence of unpleasant odours and detrimental impact on ocular and respiratory functions. In conclusion, we consider that HEFS may serve as a viable substitute for formalin solution in the preservation of rabbit cadavers.
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Affiliation(s)
- Yasin Demiraslan
- Department of Anatomy, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - İftar Gürbüz
- Department of Anatomy, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Mehmet Özbek
- Department of Histology and Embryology, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Özlem Şahan Yapicier
- Republic of Turkey Ministry of Agriculture and Forestry Veterinary Control, Central Research Institute, Bacteriology Diagnostic Laboratory, Ankara, Turkey
| | - Harun Karaca
- Department of Histology and Embryology, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Özcan Özgel
- Department of Anatomy, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Hakan Öner
- Department of Histology and Embryology, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
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Blankenburg N, Henkelmann R, Theopold J, Löffler S, Hepp P. Comparison of needle and conventional arthroscopy for visualisation of predefined anatomical structures of the knee joint: a feasibility study in human cadavers and patients. BMC Musculoskelet Disord 2024; 25:212. [PMID: 38475756 DOI: 10.1186/s12891-024-07346-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 03/08/2024] [Indexed: 03/14/2024] Open
Abstract
BACKGROUND In terms of the optics used for Knee arthroscopy, a large number of different endoscopes are currently available. However, the use of the 30° optics in knee arthroscopy has been established as the standard procedure for many years. As early as the 1990s, needle arthroscopy was occasionally used as a diagnostic tool. In addition to the development of conventional optics technology in terms of camera and resolution, needle arthroscopes are now available with chip-on-tip image sensor technology. To date, no study has compared the performance of this kind of needle arthroscopy versus standard arthroscopy in the clinical setting in terms of the visibility of anatomical landmarks. In this monocentric prospective feasibility study, our aim was to evaluate predefined anatomical landmarks of the knee joint using needle arthroscopy (0° optics) and conventional knee arthroscopy (30° optics) and compare their performance during knee surgery. METHODS Examinations were performed on eight cadavers and seven patients who required elective knee arthroscopy. Two surgeons independently performed the examinations on these 15 knee joints, so that we were able to compare a total of 30 examinations. The focus was on the anatomical landmarks that could be visualized during a conventional diagnostic knee arthroscopy procedure. The quality of visibility was evaluated using a questionnaire. RESULTS In summary, the average visibility for all the anatomic landmarks was rated 4.98/ 5 for the arthroscopy using 30° optics. For needle arthroscopy, an average score of 4.89/ 5 was obtained. Comparatively, the needle arthroscope showed slightly limited visibility of the retropatellar gliding surface in eight (4.5/ 5 vs. 5/ 5), medial rim of the patella in four (4.85/ 5 vs. 5/ 5), and suprapatellar recess in four (4.83/ 5 vs. 5/ 5) cases. Needle arthroscopy was slightly better at visualizing the posterior horn of the medial meniscus in four knee joints (4.9/ 5 vs. 4.85/ 5). CONCLUSION Needle arthroscopy is a promising technology with advantages in terms of minimally invasive access and good visibility of anatomical landmarks. However, it also highlights some limitations, particularly in cases with challenging anatomy or the need for a wide field of view.
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Affiliation(s)
- Notker Blankenburg
- Department of Orthopedic, Trauma and Plastic Surgery, University of Leipzig, Liebigstraße 20, Leipzig, 04103, Germany.
| | - Ralf Henkelmann
- Department of Orthopedic, Trauma and Plastic Surgery, University of Leipzig, Liebigstraße 20, Leipzig, 04103, Germany
| | - Jan Theopold
- Department of Orthopedic, Trauma and Plastic Surgery, University of Leipzig, Liebigstraße 20, Leipzig, 04103, Germany
| | - Sabine Löffler
- Institute of Anatomy, University of Leipzig, Liebigstraße 13, Leipzig, 04103, Germany
| | - Pierre Hepp
- Department of Orthopedic, Trauma and Plastic Surgery, University of Leipzig, Liebigstraße 20, Leipzig, 04103, Germany
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Pérez-Cruz JC, Macías-Duvignau MA, Reyes-Soto G, Gasca-González OO, Baldoncini M, Miranda-Solís F, Delgado-Reyes L, Ovalles C, Catillo-Rangel C, Goncharov E, Nurmukhametov R, Lawton MT, Montemurro N, Encarnacion Ramirez MDJ. Latex vascular injection as method for enhanced neurosurgical training and skills. Front Surg 2024; 11:1366190. [PMID: 38464665 PMCID: PMC10920354 DOI: 10.3389/fsurg.2024.1366190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 02/14/2024] [Indexed: 03/12/2024] Open
Abstract
Background Tridimensional medical knowledge of human anatomy is a key step in the undergraduate and postgraduate medical education, especially in surgical fields. Training simulation before real surgical procedures is necessary to develop clinical competences and to minimize surgical complications. Methods Latex injection of vascular system in brain and in head-neck segment is made after washing out of the vascular system and fixation of the specimen before and after latex injection. Results Using this latex injection technique, the vascular system of 90% of brains and 80% of head-neck segments are well-perfused. Latex-injected vessels maintain real appearance compared to silicone, and more flexible vessels compared to resins. Besides, latex makes possible a better perfusion of small vessels. Conclusions Latex vascular injection technique of the brain and head-neck segment is a simulation model for neurosurgical training based on real experiencing to improve surgical skills and surgical results.
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Affiliation(s)
- Julio C. Pérez-Cruz
- Laboratorio de Técnicas Anatómicas y Material Didactico, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City, Mexico
- Departamento de Anatomía, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Mario A. Macías-Duvignau
- Laboratorio de Técnicas Anatómicas y Material Didactico, Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Gervith Reyes-Soto
- Department of Head and Neck, Unidad de Neurociencias, Instituto Nacional de Cancerología, Mexico City, Mexico
| | - Oscar O. Gasca-González
- Departamento de Anatomía, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Departamento de Anatomía, Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexico City, Mexico
| | - Matias Baldoncini
- Laboratory of Microsurgical Neuroanatomy, School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
| | - Franklin Miranda-Solís
- Laboratorio de Neuroanatomía, Centro de Investigación de Anatomía y Fisiología Alto Andina, Universidad Andina del Cusco, Cusco, Peru
| | - Luis Delgado-Reyes
- Departamento de Anatomía, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Carlos Ovalles
- Department of Neurosurgery, General Hospital, Durango, Mexico
| | - Carlos Catillo-Rangel
- Department of Neurosurgery, Servicio of the 1ro de Octubre Hospital of the Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexico City, Mexico
| | - Evgeniy Goncharov
- Traumatology and Orthopedics Center, Central Clinical Hospital of the Russian Academy of Sciences, Moscow, Russia
| | - Renat Nurmukhametov
- Neurological Surgery, Peoples Friendship University of Russia, Moscow, Russia
| | - Michael T. Lawton
- Department of Neurosurgery, St. Joseph’s Hospital and Medical Center, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Nicola Montemurro
- Department of Neurosurgery, Azienda Ospedaliero Universitaria Pisana (AOUP), Pisa, Italy
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Kochaji N. Oral Maxillofacial Biopsies. CLINICAL ORAL PATHOLOGY 2024:1-48. [DOI: https:/doi.org/10.1007/978-3-031-53755-4_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
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8
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Siess M, Steinke H, Zwirner J, Hammer N. On a potential morpho-mechanical link between the gluteus maximus muscle and pelvic floor tissues. Sci Rep 2023; 13:22901. [PMID: 38129498 PMCID: PMC10739724 DOI: 10.1038/s41598-023-50058-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 12/14/2023] [Indexed: 12/23/2023] Open
Abstract
Stress urinary incontinence presents a condition not only found in female elderlies, but also in young athletes participating in high-impact sports such as volleyball or trampolining. Repeated jumps appear to be a predisposing factor. Yet the pathophysiology remains incompletely elucidated to date; especially with regard to the influence of the surrounding buttock tissues including gluteus maximus. The present study assessed the morpho-mechanical link between gluteus maximus and the pelvic floor female bodies. 25 pelves obtained from Thiel embalmed females were studied in a supine position. Strands of tissues connecting gluteus maximus with the pelvic floor obtained from 20 sides were assessed mechanically. Plastinates were evaluated to verify the dissection findings. In total, 49 hemipelves were included for data acquisition. The fascia of gluteus maximus yielded connections to the subcutaneous tissues, the fascia of the external anal sphincter and that of obturator internus and to the fascia of the urogenital diaphragm. The connection between gluteus maximus and the urogenital diaphragm withstood an average force of 23.6 ± 17.3 N. Cramér φ analyses demonstrated that the connections of the fasciae connecting gluteus maximus with its surroundings were consistent in the horizontal and sagittal planes, respectively. In conclusion, gluteus maximus is morphologically densely linked to the pelvic floor via strands of connective tissues investing the adjacent muscles. Though gluteus maximus has also been reported to facilitate urinary continence, the here presented morpho-mechanical link suggests that it may also have the potential to contribute to urinary stress incontinence. Future research combining clinical imaging with in-situ testing may help substantiate the potential influence from a clinical perspective.
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Affiliation(s)
- Maximilian Siess
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, 8036, Graz, Austria
| | - Hanno Steinke
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
| | - Johann Zwirner
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, 8036, Graz, Austria.
- Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany.
- Medical Branch, Fraunhofer Institute for Machine Tools and Forming Technology (IWU), Chemnitz, Germany.
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Antipova V, Niedermair JF, Siwetz M, Fellner FA, Löffler S, Manhal S, Ondruschka B, Pietras SM, Poilliot AJ, Pretterklieber ML, Wree A, Hammer N. Undergraduate medical student perceptions and learning outcomes related to anatomy training using Thiel- and ethanol-glycerin-embalmed tissues. ANATOMICAL SCIENCES EDUCATION 2023; 16:1144-1157. [PMID: 37337999 DOI: 10.1002/ase.2306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 05/11/2023] [Accepted: 05/18/2023] [Indexed: 06/21/2023]
Abstract
Anatomical dissection is known to serve as an integral tool in teaching gross anatomy, including postgraduate training. A variety of embalming techniques exist, resulting in different haptic and optical tissue properties. This study aimed to objectify learning outcomes and medical student perceptions related to the use of two widely used embalming techniques, namely Thiel and ethanol-glycerin embalming. Between 2020 and 2022, first- and second-year medical students enrolled in the course on topographic anatomy participated in this study. Objective structured practical examinations were carried out for the head, neck, thorax, abdomen, pelvis, and extremity regions following regional dissection just before the oral examinations began. Six to ten numbered tags were marked in prosections of each region in Thiel- and ethanol-glycerin-embalmed specimens. Following the examinations, the students were surveyed regarding the suitability of the two embalming techniques with respect to preservation, colorfastness, tissue pliability, and the suitability in preparing for their anatomy examinations. Consistently higher scores were achieved for the thoracic and abdominal regions in ethanol-glycerin-embalmed specimens when compared to Thiel. No benefit was found for Thiel-embalmed upper or lower extremities. Tissues embalmed with ethanol-glycerin were rated higher for preservation and suitability to achieve the learning objectives, tissue pliability was rated higher for Thiel-embalmed tissues. Ethanol-glycerin embalming appears to offer certain advantages for undergraduate students in recognizing visceral structures, which may align with students' ideas on tissue suitability for their learning. Consequently, the benefits reported for Thiel embalming for postgraduate study unlikely reflect its suitability for novices.
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Affiliation(s)
- Veronica Antipova
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Julian F Niedermair
- Central Radiology Institute, Johannes Kepler University Hospital, Linz, Austria
| | - Martin Siwetz
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Franz A Fellner
- Central Radiology Institute, Johannes Kepler University Hospital, Linz, Austria
- Division of Virtual Morphology, Institute of Anatomy and Cell Biology, Johannes Kepler University, Linz, Austria
| | - Sabine Löffler
- Department of Anatomy, University of Leipzig, Leipzig, Germany
| | - Simone Manhal
- Office of the Vice-Rector for Studies and Teaching, Medical University of Graz, Graz, Austria
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sandra M Pietras
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | | | - Michael L Pretterklieber
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, Rostock, Germany
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
- Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany
- Division of Biomechatronics, Fraunhofer Institute for Machine Tools and Forming Technology Dresden, Dresden, Germany
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10
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Siwetz M, Widni-Pajank H, Hammer N, Pilsl U, Bruneder S, Wree A, Antipova V. The Course and Variation of the Facial Vein in the Face-Known and Unknown Facts: An Anatomical Study. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:1479. [PMID: 37629769 PMCID: PMC10456631 DOI: 10.3390/medicina59081479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/10/2023] [Accepted: 08/14/2023] [Indexed: 08/27/2023]
Abstract
Background and Objectives: The facial vein is the main collector of venous blood from the face. It plays an important role in physiological as well as pathological context. However, to date, only limited data on the course and tributaries of the facial vein are present in contemporary literature. The aim of this study was to provide detail on the course and the tributaries of the facial vein. Materials and Methods: In 96 sides of 53 body donors, latex was injected into the facial vein. Dissection was carried out and the facial vein and its tributaries (angular vein, ophthalmic vein, nasal veins, labial veins, palpebral veins, buccal and masseteric veins) were assessed. Results: The facial vein presented a textbook-like course in all cases and crossed the margin of the mandible anterior to the masseter in 6.8% of cases, while being located deep to the zygomaticus major muscle in all cases and deep to the zygomaticus minor in 94.6% of cases. Conclusions: This work offers detailed information on the course of the facial vein in relation to neighboring structures, which shows a relatively consistent pattern, as well as on its tributaries, which show a high variability.
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Affiliation(s)
- Martin Siwetz
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
| | - Hannes Widni-Pajank
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
- Department of Oral and Maxillofacial Surgery, Klagenfurt Am Wörthersee Clinic, Feschnigstraße 11, A-9020 Klagenfurt am Wörthersee, Austria
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
- Department of Orthopedic and Trauma Surgery, University of Leipzig, D-04103 Leipzig, Germany
- Division of Biomechatronics, Fraunhofer Institute for Machine Tools and Forming Technology Dresden, D-09126 Dresden, Germany
| | - Ulrike Pilsl
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
| | - Simon Bruneder
- Department of Oral and Maxillofacial Surgery, Medical University of Graz, Auenbruggerplatz 5, A-8036 Graz, Austria
| | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstr. 9, D-18057 Rostock, Germany
| | - Veronica Antipova
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
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Siwetz M, Widni-Pajank H, Hammer N, Pilsl U, Bruneder S, Wree A, Antipova V. New Insights into the Communications of the Facial Vein with the Dural Venous Sinuses. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:609. [PMID: 36984610 PMCID: PMC10052974 DOI: 10.3390/medicina59030609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/14/2023] [Accepted: 03/17/2023] [Indexed: 03/22/2023]
Abstract
Background and Objectives: Anastomoses of the extracranial and intracranial venous system have been described in the literature. The presence of such anastomoses may facilitate a possible spread of infection into the dural venous sinuses. However, the frequency and relevance of such anastomoses is highly debated. The aim of this study was to quantify frequencies of anastomoses between the facial vein and the dural venous sinuses. Materials and Methods: In 32 sides of 16 specimens, latex was injected into the facial vein. Dissection was carried out to follow and described these anastomoses, yielding the presence of latex in the intracranial venous system. Results: In 97% of cases, a dispersal of latex into the cavernous sinus as well as anastomoses was observed. A further dispersal of latex into other dural venous sinuses was found at rates ranging between 34% (transverse sinus)-88% (superior petrosal sinus), respectively. Conclusions: The presence of anastomoses between the extracranial and intracranial venous system in a majority of cases needs to be considered when dealing with pathologies as well as procedures in the facial region.
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Affiliation(s)
- Martin Siwetz
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
| | - Hannes Widni-Pajank
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
- Department of Oral and Maxillofacial Surgery, Klagenfurt Am Wörthersee Clinic, Feschnigstraße 11, A-9020 Klagenfurt am Wörthersee, Austria
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
- Department of Orthopedic and Trauma Surgery, University of Leipzig, D-04103 Leipzig, Germany
- Division of Biomechatronics, Fraunhofer Institute for Machine Tools and Forming Technology Dresden, D-09126 Dresden, Germany
| | - Ulrike Pilsl
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
| | - Simon Bruneder
- Department of Oral and Maxillofacial Surgery, Medical University of Graz, Auenbruggerplatz 5, A-8036 Graz, Austria
| | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstr. 9, D-18057 Rostock, Germany
| | - Veronica Antipova
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Auenbruggerplatz 25, A-8036 Graz, Austria
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Incidental finding of Clostridium perfringens on human corpses used for the anatomy course. Anat Sci Int 2023; 98:151-154. [PMID: 36471134 PMCID: PMC9734960 DOI: 10.1007/s12565-022-00699-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 11/26/2022] [Indexed: 12/12/2022]
Abstract
Post-mortem specimens used for anatomy teaching are commonly embalmed using compositions of chemicals, with the objective to maintain tissue quality and to avoid putrefaction. Monitoring for bacterial or fungal contamination is becoming increasingly important especially when measures are taken to minimize exposure by chemicals such as formaldehyde. In this case, random swabs were taken from six corpses embalmed with ethanol-glycerin and Thiel embalming. Cultures and MALDI-TOF analyses yielded four cases of Clostridium perfringens contamination. C. perfringens is of special interest as a human pathogen. A potential source was identified in the containers filled with the moistening solution. Cross contamination with Clostridium species has likely occurred between corpses sharing the moistening solution and soaking the cover linen directly within the containers. To minimize any risk for those exposed, the moistening solutions were discarded and all equipment thoroughly disinfected. The specimens had to be cremated as they formed a potential source of Clostridium spores. Deviating from previous routines it was formalized that the cover linen must not be submerged in the moistening contains rather than moistening the specimens directly with dedicated vessels. Follow-up analyses yielded no further contamination with C. perfringens.
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Tamash Y, Hammer N, Varga I, Supilnikov A, Iukhimetc S. Arterial Blood Supply of the Mesosalpinx Appears Segmentally Organized in Absence of Uterine Tubes Arteries. Physiol Res 2022. [DOI: 10.33549/physiolres.935015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Arterial branches to the uterus and ovaries that pass through the mesosalpinx contribute significantly to the maintenance of the ovarian reserve. Especially arterial supply of the uterine tube is provided by a number of anastomoses between both the uterine and ovarian vessels. Knowledge on the morphologic peculiarities will allow to identify main contributors especially blood flow ultrasound examination for the purpose of ovary preserving surgery. This study aimed at identifying landmarks especially for so-called low-flow tubal vessels. Arteries of 17 female Thiel-embalmed bodies were studied along three preselected paramedian segments and measurements taken. A section was made through the center of the ovary perpendicular to uterine tube, then the mesosalpinx tissue distance was divided into 3 equivalent zones: upper, middle and lower thirds. The surface area of the mesosalpinx averaged 1088 ± 62 mm2. 47.7 ± 7.1 % of the mesosalpinx zones included macroscopically visible vessels. The lower third segment of mesosalpinx was the thickest averaging 2.4 ± 1.5 mm. One to three tubal branches were identified in the middle third of the mesosalpinx. Arterial anastomoses were found in the upper segment of the mesosalpinx, but no presence of a marginal vessel supplying the fallopian tube could be found. Statistically significant moderate positive correlations were established between the diameters of the mesosalpingeal arteries between the three zones. The mesosalpinx, uterine tube and the ovary form areas of segmental blood supply. Variants of tubal vessels appear to be a sparse source of blood supply.
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Siwetz M, Kieser D, Ondruschka B, Pretterklieber B, Hammer N. Is There a Nerve-free Zone in Which a Subscapularis Split Can Safely be Performed? An Anatomical Study Using Embalmed Specimens. Clin Orthop Relat Res 2022; 480:2432-2438. [PMID: 35857337 PMCID: PMC10538941 DOI: 10.1097/corr.0000000000002326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 06/27/2022] [Indexed: 01/31/2023]
Abstract
BACKGROUND The subscapularis muscle, which is part of the rotator cuff, is located anterior to the shoulder. In anterior approaches to the shoulder, its supplying nerves are at risk of iatrogenic injury, which may cause postoperative complications. It is unclear whether there is any nerve-free zone in which a subscapularis split can be performed without risking nerve damage. QUESTIONS/PURPOSES In an anatomical study, we asked: (1) With the arm abducted 60° and externally rotated, what are the median and shortest distances between the entrance point of the subscapular nerves into subscapularis muscle and the myotendinous junction of this muscle? (2) What are those distances in other positions of the shoulder? (3) Did those measurements differ between specimen sexes or sides? METHODS In 84 shoulders of 66 embalmed anatomic specimens, the distance from the myotendinous junction of the subscapularis muscle to the entrance points of the subscapular nerves into the subscapularis muscle was measured using an inelastic thread and a millimeter gauge with the arm abducted 60° and rotated externally. In 16 of 84 shoulders, which were selected randomly, after taking the measurements with the arm abducted 60° and rotated externally, arm positions were changed and further measurements were taken with the arm abducted 60° and rotated neutrally, abducted 60° and rotated internally, and abducted 90° and rotated externally. The positions of the entrance points were described with statistical parameters and compared between different sides, sexes, and joint positions. Measurements were verified using eight fresh-frozen shoulders, showing no difference in distances compared with embalmed specimens and confirming reproducibility of measurements. Absolute distances were used to minimize possible distortion when using correlations and for straightforwardness and clinical applicability. RESULTS The median (range) distance was 43 mm (24 to 64) for the upper subscapular nerve and 38 mm (23 to 59) for the lower subscapular nerve with the arm rotated externally and abducted 60°. In the 16 subsamples, internal rotation decreased the distance to 34 mm (24 to 49) and 31 mm (15 to 43), respectively, and maximal external rotation and 90° of abduction increased it up to 49 mm (30 to 64) and 41 mm (27 to 56). Comparison of left and right sides yielded no difference. Comparison of sexes showed distances for the lower subscapular nerve of 36 mm (23 to 54) in females versus 39 mm (24 to 60) in males. CONCLUSION In no specimen did the nerve come closer than 23 mm medial to the myotendinous junction with the arm rotated externally and abducted. Therefore, not exceeding a distance of 20 mm medial to the myotendinous junction with the arm rotated externally seems to provide sufficient protection from nerve injury during surgery. CLINICAL RELEVANCE Based on the described zone of 20 mm medial to the myotendinous junction, the risk of nerve injury in a subscapularis split approach can be minimized.
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Affiliation(s)
- Martin Siwetz
- Gottfried Schatz Research Center, Division of Macroscopic and Clinical Anatomy, Medical University of Graz, Graz, Austria
| | - David Kieser
- Department of Orthopaedic Surgery and Musculoskeletal Medicine, Canterbury School of Medicine, University of Otago, Christchurch, New Zealand
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Bettina Pretterklieber
- Gottfried Schatz Research Center, Division of Macroscopic and Clinical Anatomy, Medical University of Graz, Graz, Austria
| | - Niels Hammer
- Gottfried Schatz Research Center, Division of Macroscopic and Clinical Anatomy, Medical University of Graz, Graz, Austria
- Department of Trauma, Orthopedic and Plastic Surgery, University Hospital of Leipzig, Leipzig, Germany
- Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany
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Steinke H, Saito T, Kuehner J, Reibetanz U, Heyde CE, Itoh M, Voelker A. Sacroiliac innervation. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2022; 31:2831-2843. [PMID: 36029360 DOI: 10.1007/s00586-022-07353-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 08/11/2022] [Accepted: 08/12/2022] [Indexed: 06/15/2023]
Abstract
PURPOSE To investigate the innervation pattern of the sacroiliac region, especially with regard to the sacroiliac joint (SIJ). Dorsal SIJ innervation was analyzed and described. Our main hypothesis was that nerves reach the SIJ dorsally, passing ligamental compartments, as this would explain dorsal SIJ pain. METHODS To examine sacroiliac innervation, we followed the nerves in over 50 specimens over several years. Plastinated slices were evaluated, nerves in the region were stained histologically, and the data were summarized as 3D models. RESULTS The Rami communicans and posterior branches of the spinal nerves and their branches that form a dorsal sacral plexus and communicating branches, together with corresponding vessels, were observed to form neurovascular bundles embedded by tiny fatty connectives in gaps and tunnels. Branches of L5-S1 pass the inner sacroiliac ligaments (the interosseous sacroiliac ligament and axial interosseous ligament). The outer sacroiliac ligaments (posterior sacroiliac ligaments, long posterior sacroiliac ligament, sacrotuberal ligament, thoracolumbar fascia) are passed by the S1-S4 branches. However, although the paths of these nerves are in the direction of the SIJ, they do not reach it. It is possible that impingement of the neurovascular bundles may result in pain. Moreover, the gaps and tunnels connect to the open dorsal SIJ. CONCLUSION Our findings suggest that Bogduk's term "sacroiliac pain" correlates to "sacroiliac innervation", which consists of "inner-" and "outer sacroiliac ligament innervation", and to ventral "SIJ pain". The watery gaps and tunnels observed could play a significant role in innervation and thus in the origins of SIJ pain. LEVEL OF EVIDENCE Individual cross-sectional studies with consistently applied reference standard and blinding.
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Affiliation(s)
- Hanno Steinke
- Department of Anatomy, University Leipzig, Liebigstr. 13, 04103, Leipzig, Germany.
| | - Toshiyuki Saito
- Department of Anatomy, Tokyo Medical University, 6-1-1 Shinjuku-ku, Tokyo, 160-8402, Japan
| | - Janne Kuehner
- Department of Anatomy, University Leipzig, Liebigstr. 13, 04103, Leipzig, Germany
| | - Uta Reibetanz
- Department of Biophysics, University Leipzig, Härtelstr. 16-18, 04107, Leipzig, Germany
| | - Christoph-Eckhard Heyde
- Department of Orthopeadics, Trauma and Plastic Surgery, University Hospital Leipzig, Liebigstr. 20, 04103, Leipzig, Germany
| | - Masahiro Itoh
- Department of Anatomy, Tokyo Medical University, 6-1-1 Shinjuku-ku, Tokyo, 160-8402, Japan
| | - Anna Voelker
- Department of Orthopeadics, Trauma and Plastic Surgery, University Hospital Leipzig, Liebigstr. 20, 04103, Leipzig, Germany
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Lateral para-olecranon approach: surgical guide and anatomical considerations to the anconeus branch: is there a nerve-free zone? Eur J Trauma Emerg Surg 2022; 49:875-884. [PMID: 36266477 PMCID: PMC10175359 DOI: 10.1007/s00068-022-02141-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 10/10/2022] [Indexed: 11/03/2022]
Abstract
PURPOSE In the last decades, total elbow arthroplasty, elbow osteosynthesis and revision surgery have been more popularized. The study aimed to assess the course of the anconeus branch of the radial nerve in relation to two variations of the lateral para-olecranon approach, considering iatrogenic nerve injuries. METHODS The study consisted of 120 upper extremities from 60 Thiel-embalmed human specimens. Two randomized versions of the lateral para-olecranon approach (centrally orientated: P1 and laterally orientated: P2) were performed. The olecranon and the intersection points to the anconeus branch of the radial nerve were determined as anatomical landmarks. The measurements were assessed by two independent observers. Differences were analyzed using the Student's t test; associations were computed with the Pearson correlation (r). An alpha of 0.05 (p) and a confidence interval of 95% were set. RESULTS The intersection points averaged 12.3 cm (SD 1.8, range 8.2-16.8) for P1 versus 5.5 cm (SD 1.4, range 3.0-9.2) for P2 (p ≤ 0.001). Statistically significantly higher values for male and longer humeral specimens were revealed (all values: p < 0.05). Comparison of left and right sides yielded no difference. Excellent inter-rater agreements were found (ICC = 0.902, range 0.860-0.921). A correlation was evaluated between the humeral length and the distances in both approaches (P1: r = 0.550, p < 0.001, P2: r = 0.669, p < 0.001). CONCLUSION The data presented here allow preservation of the anconeus branch. The P1 forms a potential advantage by owing a broader safe zone. Using the centrally orientated approach seems to provide adequate nerve protection during surgery for one of the motor branches for extension of the elbow joint and might result in improved postoperative benefits.
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Soonklang N, Saowakon N. Evaluation of formaldehyde exposure among gross dissection after modified embalming solution and health assessment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:65642-65654. [PMID: 35488160 DOI: 10.1007/s11356-022-19704-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 03/10/2022] [Indexed: 06/14/2023]
Abstract
Mainly embalming fixative contains formaldehyde which is classified as a carcinogen. People who work with cadavers have been at higher risk of cancer after formaldehyde exposure. We have formulated a less-formalin fixative (contained 3.6% formaldehyde,23.8% ethanol, 15% glycerin, and 0.2% phenol in the water) for preserving cadavers. Therefore, the objective of the present study was to evaluate the level of atmospheric formaldehyde indoors and the breathing exposure of medical students during dissection classes. We also analyzed the pulmonary parameters and effects of formaldehyde. The levels of atmospheric formaldehyde indoors and personal breathing exposure were sampled during anatomy dissection classes (musculoskeletal system, respiratory system, and abdominopelvic organ system) using sorbent tubes with air sampling pumps. Samples were then analyzed using Gas Chromatography with Flame Ionization Detector (GC-FID). The mean level of formaldehyde indoor air among the three classes was 0.518 ± 0.156 ppm whereas the formaldehyde level in the personal breathing zone was 0.956±0.408 ppm, which exceeded the recommended exposure standards of international agencies, including NIOSH agency and PEL of Thailand legislation. The laboratory had high humidity, high room temperature, and poor air ventilation. There was a significant difference in FVC, FEV1, and PEF (p < 0.05) between the sexes of students. Comparison pulmonary parameters between students and instructors showed that all parameters of the pulmonary function test had no significant differences. General fatigue and burnings of eyes and nose associated with strong odor were the most common symptoms reported during the dissection classes. The modified embalming fixative was used less formalin with ethanol-glycerin mixture, and it was suitable for the study of medical students, with few side effects of respiratory problems. However, the modified exhaust ventilation with local table-exhaust ventilation and heating-ventilation-air conditioning system performance were urgent issues for reducing levels of formaldehyde indoor air in the dissection room.
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Affiliation(s)
- Nantawan Soonklang
- Department of Preclinical Sciences, Faculty of Medicine, Thammasat University, Pathumthani, 12120, Thailand
| | - Naruwan Saowakon
- School of Preclinical Sciences, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand.
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Hammer N. 30 years of Thiel embalming - A systematic review on its utility in medical research. Clin Anat 2022; 35:987-997. [PMID: 35879645 PMCID: PMC9541350 DOI: 10.1002/ca.23936] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/13/2022] [Accepted: 07/13/2022] [Indexed: 11/06/2022]
Abstract
In 1992, Walter Thiel described and embalming method that rendered 'lifelike' tissues. Over the last 30 years, the Thiel method has been introduced worldwide for medical training and scientific purposes. This review examines research which can be linked to the use of Thiel embalming. A systematic review was performed to identify articles published in the following categories: research content, disciplines involved, sources and quantities of tissues deployed, and changes in research scope related to changes in the chemical composition of Thiel embalming. 424 publications were included. A number of adaptations to the original Thiel protocol were found, aiming to provide suitable tissue-substitutes in the development of emerging medical technologies or procedures. Musculoskeletal surgery, anesthesia and intensive care were the most common disciplines that used Thiel embalmed tissues for research. Anatomy and biomechanics played a lesser role. An increase over time was observed in research outputs related to the Thiel method, while the number of specimens used per study decreased. The main centers using Thiel embalming were in Graz, Dundee, Sapporo, Bern, Zurich and Ghent, which jointly accounted for more than 54% of all research conducted using this method. Following three decades of use, the Thiel method has evolved into being a well-established embalming technique for research purposes. Its future is challenged by the demanding requirements on both technical facilities and personnel, limitations of certain chemicals for use as fixatives, costs, and questions as to how 'lifelike' the embalmed-tissues are from an objective standpoint, all of which warrants future investigations. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Austria.,Department of Orthopedic and Trauma Surgery, University of Leipzig, Germany.,Fraunhofer Institute for Machine Tools and Forming Technology (IWU), Medical Branch, Germany
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Celik S, Bilge O, Ozdemir M, Dionigi G, Anuwong A, Makay O. Modified Larssen solution (MLS)-fixed cadaver model for transoral endoscopic thyroidectomy vestibular approach (TOETVA) education: a feasibility study. Surg Endosc 2022; 36:5518-5530. [PMID: 35471255 DOI: 10.1007/s00464-022-09224-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Accepted: 03/26/2022] [Indexed: 01/16/2023]
Abstract
BACKGROUND Training formats for transoral endoscopic thyroidectomy vestibular approach (TOETVA) are limited. Our aim was to create and investigate a TOETVA training model for general and ENT surgeons. METHODS A total of 15 modified Larssen solution (MLS) human cadavers were used in the study. A day duration TOETVA human cadaver workshops were offered in two years consecutive. Post-training verbal and online questionnaires were applied to all trainers to evaluate course structure and program, organoleptic characteristics of MLS-fixed human cadavers, and TOETVA training effectiveness. Cost assessment is included in the study. RESULTS Ninety-eight participants, i.e., 14 trainers and 84 hands-on (HO) and observer (OB) trainees, attended the workshops, completed the tasks assigned, and fulfilled the questionnaires. Implementation of all steps of TOETVA was approved positively by 89.8% of all participants, 94.4% of HO, and 83.3% of OB trainees. Regarding human cadaver and teaching quality, 10.8 ± 0.8 (10-12) human cadavers were "practical" by 13.2 (94.5%) of the trainers, and by 33.3 (92.5%) of the trainees for all steps of TOETVA. The cadavers were stored for 4.53 years and used 6.27 times repeatedly for endoscopic workshops and research studies. TOETVA workshop cost with repeatable use of MLS-fixed human cadaver is half of other performed TOETVA workshops. CONCLUSIONS A TOETVA human cadaver workshop model has not been reported yet. Our findings suggest the feasibility of MLS-fixed human cadaver model for training of TOETVA, preserve the organoleptic properties necessary for the implementation of surgical steps, and reduce the cost.
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Affiliation(s)
- Servet Celik
- Department of Anatomy, Faculty of Medicine, Ege University, 35100, Bornova-Izmir, Turkey.
| | - Okan Bilge
- Department of Anatomy, Faculty of Medicine, Ege University, 35100, Bornova-Izmir, Turkey
| | - Murat Ozdemir
- Division of Endocrine Surgery, Department of General Surgery, Faculty of Medicine, Ege University, 35100, Bornova-Izmir, Turkey
| | - Gianlorenzo Dionigi
- Division of General Surgery, Endocrine Surgery Section, Department of Pathophysiology and Transplantation, Istituto Auxologico Italiano IRCCS, The University of Milan, Milan, Italy
| | - Angkoon Anuwong
- Minimally Invasive Endocrine and Surgery Division, Department of Surgery, Police General Hospital, 492/1, Rama I Road, Pathumwan, Bangkok, 10330, Thailand
| | - Ozer Makay
- Division of Endocrine Surgery, Department of General Surgery, Faculty of Medicine, Ege University, 35100, Bornova-Izmir, Turkey
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Anatomical Analysis of the Lateral Femoral Cutaneous Nerve and Its Passage beneath the Inguinal Ligament. Plast Reconstr Surg 2022; 149:1147-1151. [PMID: 35271552 DOI: 10.1097/prs.0000000000009034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Meralgia paraesthetica is a mononeuropathy of the lateral femoral cutaneous nerve. According to the literature, the nerve travels beneath the inguinal ligament 1.3 to 5.1 cm medial to the anterior superior iliac spine. Compression at this site may cause pain and paresthesia. The aim of this study was to provide more accurate measurements to improve the diagnostic and surgical management of meralgia paraesthetica. METHODS The lateral femoral cutaneous nerve was dissected bilaterally in 50 Thiel-embalmed human cadavers. Measurements were performed with a standard caliper at the superior and inferior margins of the inguinal ligament. The distance from the inner lamina of the anterior superior iliac spine to the medial margin of the lateral femoral cutaneous nerve was measured. Data were collected and statistical analysis was performed with R. RESULTS Ninety-three lateral femoral cutaneous nerves of 50 cadavers were dissected. In 6 percent of cadavers, the lateral femoral cutaneous nerve could not be found. The mean distance from the inner lamina of the anterior superior iliac spine to the lateral femoral cutaneous nerve's medial border was 2.1 ± 1.3 cm (range, 0.2 to 6.4 cm; 95 percent CI, 1.8 to 2.4 cm) at the superior margin of the inguinal ligament and 1.9 ± 1.4 cm (range, 0.2 to 3.0 cm; 95 percent CI, 1.6 to 2.2 cm) at the inferior border of the inguinal ligament. CONCLUSION This anatomical study shows that the majority of the lateral femoral cutaneous nerve passes beneath the inguinal ligament in a very narrow area of 0.6 cm.
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Lipnik G, Schwarz AM, Maier MJ, Grechenig P, Schwarz UM, Feigl GC, Hohenberger GM. Dorsal Minimally Invasive Plate Osteosynthesis of the Humerus: Feasibility and Risk of Nervous Injury of a Modified Technique in an Anatomical Study. Ann Anat 2022; 243:151958. [DOI: 10.1016/j.aanat.2022.151958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 05/01/2022] [Accepted: 05/09/2022] [Indexed: 10/18/2022]
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Formalin-free soft embalming of human cadavers using N-vinyl-2-pyrrolidone: perspectives for cadaver surgical training and medical device development. Anat Sci Int 2022; 97:273-282. [PMID: 35460067 DOI: 10.1007/s12565-022-00664-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 03/30/2022] [Indexed: 02/05/2023]
Abstract
The traditional apprenticeship approach to surgical skill education for young surgeons has drastically changed to more systematic surgical training using cadavers. Cadavers fixed with formalin are not suitable for surgical training because of their associated health hazards and overhardening. Recently, we established a formalin-free soft preservation method for human cadavers using N-vinyl-2-pyrrolidone. Since 2012, 61 cadavers have been embalmed with pyrrolidone in our institution. Tissues of pyrrolidone-embalmed cadavers are soft and pliable, and their bodies can be preserved for as long as 37 months without any signs of corruption. In this review, we introduce our recent attempts to apply pyrrolidone-embalmed cadavers in surgical and medical procedure training, including endotracheal intubation, motion physiology of the vocal folds, laparoscopic surgery, endoscopic skull base surgery, and development of novel medical devices. Future research perspectives on pyrrolidone embalming are discussed.
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Rajasekhar SSSN, Kumar VD, Veena P, Mourya DK, Chathurvedula L, Raveendranath V. The Usefulness of Genelyn® Embalming Method for Gynaecological Surgical Skill Training: a New Cadaveric Training Model for Laparoscopic Hysterectomy. Indian J Surg 2022. [DOI: 10.1007/s12262-021-02928-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Efficacy of urea solution reperfusion to a formalin-embalmed cadaver for surgical skills training. Anat Sci Int 2022; 97:264-272. [PMID: 35239164 DOI: 10.1007/s12565-022-00653-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 02/08/2022] [Indexed: 11/01/2022]
Abstract
Formaldehyde has been traditionally used for embalming human cadavers for gross anatomy education and surgical skills training. However, exposure to formaldehyde negatively affects human health. This study aimed to assess the efficacy of reperfusing urea solution to a formalin-embalmed cadaver for surgical skills training and then investigate the cadaver's tissue elasticity alteration after being soaked into the urea solution. Twelve surgeons evaluated the similarity of tissue characteristics between the cadaver (embalmed by formalin solution and reperfused by urea solution) and a living human body. Furthermore, the tissue formaldehyde content and mechanical properties of the formalin-fixated femoral skin and artery specimens with or without soaking into urea solution were measured. Results showed that the tactile assessment, skin incision, vessel ligation and suture, and decollement were better and more useful in the cadaver reperfused by urea solution than in the cadaver merely fixated by formalin solution. In the urea-reperfused cadaver, the volatilized, or tissue formaldehyde levels declined. The stiffness and Young's modulus of the femoral skin and artery were also lower in the specimen than in the mere formalin-fixated specimen. In conclusion, reperfusion of urea solution to the formalin-fixated cadaver makes anatomical education and surgical skills training more efficient with fewer requirements for cadaver management.
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Humbert M, Micault E, Moreau S, Patron V, Bois J, Hitier M. The advantages of modified Thiel technique in head and neck surgical anatomy teaching. Surg Radiol Anat 2022; 44:345-352. [DOI: 10.1007/s00276-022-02895-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 01/24/2022] [Indexed: 11/28/2022]
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Thiel embalming in neonates: methodology and benefits in medical training. Anat Sci Int 2022; 97:290-296. [PMID: 35137346 PMCID: PMC9167811 DOI: 10.1007/s12565-022-00650-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 01/18/2022] [Indexed: 12/04/2022]
Abstract
Current teaching and training methods for surgical techniques in the pediatric population involve artificial models (manikins), animals or adult human cadavers embalmed using various techniques. We found no references in the literature concerning the use of the Thiel method in the pediatric population. The aim of this study, therefore, was to assess the viability of using pediatric human cadavers embalmed through Thiel’s technique and to compare them with standard pediatric manikins. After donation of a 24-week stillborn, the Thiel technique was carried out for fixation following the usual protocol. A video recording with eye-tracking glasses was used to perform an examination, and techniques. The same procedures were conducted on a pediatric manikin. Medical students, medical residents and physicians were asked to respond to questions in an online survey after being shown the video. A total of 92 responses were obtained. The Thiel-embalmed stillborn was assessed as superior to the manikin in all items. Our study confirmed that this technique is feasible even with extremely small donors. The value of this form of preservation for medical training is not widely known though it is receiving increasing interest. Our results show that Thiel fixation in pediatrics is clearly more highly valued than a manikin and offers great potential. This innovative application of the Thiel method in the pediatric population is technically possible. It poses no additional difficulties and is very positively assessed for undergraduate and postgraduate teaching.
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QUEIROZ ANDRÉAB, RODRIGUES ALESSANDRA, CARDOZO MARITAV, COSTA NATÁLIAT, SOARES LAURAG, FECHIS ALISSOND, OLIVEIRA FABRÍCIOS. Biomechanical and microbiological analysis of embalmed cats – acute effect of conservation. AN ACAD BRAS CIENC 2022; 94:e20201583. [DOI: 10.1590/0001-3765202120201583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 11/05/2020] [Indexed: 11/22/2022] Open
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Thompson B, Green E, Scotcher K, Keenan ID. A Novel Cadaveric Embalming Technique for Enhancing Visualisation of Human Anatomy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1356:299-317. [PMID: 35146627 DOI: 10.1007/978-3-030-87779-8_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Within the discipline of anatomical education, the use of donated human cadavers in laboratory-based learning activities is often described as the 'gold standard' resource for supporting student understanding of anatomy. Due to both historical and educational factors, cadaveric dissection has traditionally been the approach against which other anatomy learning modalities and resources have been judged. To prepare human donors for teaching purposes, bodies must be embalmed with fixative agents to preserve the tissues. Embalmed cadavers can then be dissected by students or can be prosected or plastinated to produce teaching resources. Here, we describe the history of cadaveric preservation in anatomy education and review the practical strengths and limitations of current approaches for the embalming of human bodies. Furthermore, we investigate the pedagogic benefits of a range of established modern embalming techniques. We describe relevant cadaveric attributes and their impacts on learning, including the importance of colour, texture, smell, and joint mobility. We also explore the emotional and humanistic elements of the use of human donors in anatomy education, and the relative impact of these factors when alternative types of embalming process are performed. Based on these underpinnings, we provide a technical description of our modern Newcastle-WhitWell embalming process. In doing so, we aim to inform anatomy educators and technical staff seeking to embalm human donors rapidly and safely and at reduced costs, while enhancing visual and haptic tissue characteristics. We propose that our technique has logistical and pedagogic implications, both for the development of embalming techniques and for student visualisation and learning.
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Yoshida S, Miyano G, Tanaka M, Ikegami M, Kato H, Seo S, Ochi T, Koga H, Lane GJ, Takahashi M, Sakamoto K, Ichimura K, Yamataka A. Cadaver Training for Minimally Invasive Pediatric Surgery: A Preliminary Report. J Laparoendosc Adv Surg Tech A 2021; 31:1485-1490. [PMID: 34846942 DOI: 10.1089/lap.2021.0333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Aim: To report the value of adult cadavers for training in minimally invasive surgical (MIS) techniques for pediatric surgery (PS). Materials and Methods: Three teams, each consisting of a board-certified consultant pediatric surgeon (CS), a senior trainee (ST), and a junior trainee (JT), attended a cadaver surgical training (CST) course involving five procedures: thoracoscopic esophagoesophagostomy (TEE), thoracoscopic right lower lobectomy (TRL), laparoscopic fundoplication (LFN), laparoscopic hepaticoduodenostomy (LHD), and laparoscopic ureteroureterostomy (LUU). The same teams also performed LFN on live pigs. Attendees (3 CSs, 3 STs, and 3 JTs) were administered a questionnaire to rate their CST experience according to five criteria (tissue texture, organ size, operative field, "feel," and anatomic relationships) using a 4-point scale with 0 being the worst response. Scores were averaged per procedure per attendee groups and compared. LFN was also compared between a cadaver and a pig. Results: End-point (1): For LFN, cadaver scores were significantly higher than pig scores for anatomic relationships (P = .0001), operative field (P = .0053), and organ size (P = .0481). End-point (2): TRL and LFN were ranked together as being most realistic, followed by TEE and LUU, then LHD. End-point (3): Anatomic relationships and operative field consistently scored highly for all attendee groups. End-point (4): CSs and STs tended to award higher scores than JTs although differences were not statistically significant. Conclusions: CST is a valuable opportunity for PS trainees to experience highly realistic training in minimally invasive surgery. Pig training was inferior. IRB Number: 2019173.
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Affiliation(s)
- Shiho Yoshida
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Go Miyano
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Masafumi Tanaka
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Michiaki Ikegami
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Haruki Kato
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Shogo Seo
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Takanori Ochi
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Hiroyuki Koga
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Geoffrey J Lane
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Makoto Takahashi
- Department of Coloproctological Surgery and Juntendo University School of Medicine, Tokyo, Japan
| | - Kazuhiro Sakamoto
- Department of Coloproctological Surgery and Juntendo University School of Medicine, Tokyo, Japan
| | - Koichiro Ichimura
- Department of Anatomy and Life Structure, Juntendo University School of Medicine, Tokyo, Japan
| | - Atsuyuki Yamataka
- Department of Pediatric General and Urogenital Surgery, Juntendo University School of Medicine, Tokyo, Japan
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Skopnik-Chicago M, Poblete-Cordero K, Zamora N, Bastías R, Lizana PA. Comparison of Haptic and Biometric Properties, Bacterial Load, and Student Perception of Fixative Solutions: Formaldehyde Versus Chilean Conservative Fixative Solution with and without Formaldehyde in Pig Kidneys. ANATOMICAL SCIENCES EDUCATION 2021; 14:836-846. [PMID: 33340444 DOI: 10.1002/ase.2042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 11/20/2020] [Accepted: 12/16/2020] [Indexed: 06/12/2023]
Abstract
One of the most widely used solutions to fix and preserve organic tissues is formaldehyde, despite reservations regarding its toxicity and the fact that formaldehyde-embalmed bodies lose their original characteristics. Anatomy laboratories have been replacing formaldehyde with solutions that retain the characteristics of fresh tissue. For this purpose, alternative solutions with a very low concentration of formaldehyde or without any formaldehyde have been analyzed. The objective of this study was to compare biometry, coloration, haptic properties, and bacterial load on animal specimens (pig kidneys) embalmed with formaldehyde, and with Chilean Conservative Fixative Solution with and without formaldehyde (formaldehyde chCFS and formaldehyde-free chCFS). Also, the perception of health and biological science students toward specimens treated with different solutions was assessed. The results indicated that there were no significant differences in specimens' retraction, or bacterial load. Students showed a preference for organs embalmed in formaldehyde chCFS and formaldehyde-free chCFS; indicating that with these treatments they could better visualize structures and that the prosections had greater flexibility and the colors were more similar to those of fresh tissue. Additionally, students recommended the material embalmed in formaldehyde chCFS and formaldehyde-free chCFS for anatomy learning. In contrast, students indicated that formaldehyde-fixation negatively affected their practical experience. In conclusion, embalming with formaldehyde chCFS or formaldehyde-free chCFS provides an advantageous practical experience over the use of formaldehyde and may be an alternative to replace the use of formaldehyde in anatomy laboratories.
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Affiliation(s)
- Marianne Skopnik-Chicago
- Laboratory of Morphological Sciences, Institute of Biology, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Katherine Poblete-Cordero
- Laboratory of Morphological Sciences, Institute of Biology, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Natali Zamora
- Laboratory of Microbiology, Institute of Biology, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Roberto Bastías
- Laboratory of Microbiology, Institute of Biology, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Pablo A Lizana
- Laboratory of Morphological Sciences, Institute of Biology, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
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A Rare Case of Facial Artery Branching-A Review of the Literature and a Case Report with Clinical Implications. MEDICINA (KAUNAS, LITHUANIA) 2021; 57:medicina57111172. [PMID: 34833392 PMCID: PMC8625730 DOI: 10.3390/medicina57111172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 10/22/2021] [Accepted: 10/25/2021] [Indexed: 12/01/2022]
Abstract
Background and Objectives: Vascular variations appear as morphologically distinct patterns of blood diverging from the most commonly observed vessel patterns. The facial artery is considered to be the main vessel for supplying blood to the anterior part of the face. An anatomical understanding of the facial artery, its course, its topography, and its branches is important in medical and dental practice (especially in neck and face surgery), and is also essential for radiologists to be able to interpret vascular imaging in the face following angiography of the region. A profound knowledge of the arteries in the region will aid in minimizing the risks to the patient. Materials and Methods: In our publication a narrative literature review and a case report are presented. Results: A rare case of a facial artery pattern has been described anatomically for the first time with respect to its course and branching. This variation was found on the left side of a 60-year-old male corpse during anatomical dissection. The anterior branch of the facial artery arched in the direction of the labial angle, and there divided into the inferior and superior labial arteries. At the same time, the posterior branch coursed vertically and superficially to the masseter muscle. It here gave off the premasseteric branch, and continued towards the nose, where it ran below the levator labii superioris and the levator labii superioris alaeque nasi muscles and terminated at the dorsum nasi. Conclusions: Our review of the literature and the case report add to knowledge on the facial artery with respect to its topographical anatomy and its branching and termination patterns, as well as the areas of supply. An exact knowledge of individual facial artery anatomy may play an important role in the planning of flaps or tumor excisions due to the differing vascularization and can also help to prevent artery injuries during aesthetic procedures such as filler and botulinum toxin injections.
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Isaacson G, Wulc AE. Applicability of a sheep model for training in plastic surgery of eyelids and orbit. EAR, NOSE & THROAT JOURNAL 2021; 101:43S-49S. [PMID: 34551606 DOI: 10.1177/01455613211047036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE To test the applicability of a fresh tissue model for teaching facial plastic techniques and approaches to the eyelids and orbit. DESIGN Observational animal experiments. SUBJECTS Ten prepubescent sheep heads harvested following humane euthanasia at the completion of unrelated live animal research. METHODS Young sheep were saline perfused at the end of an in vivo protocol. Head and neck tissues were harvested and refrigerated for 3-7 days. An experienced oculoplastic surgeon and an otolaryngologist explored the feasibility of common oculoplastic procedures in the ovine model. RESULTS The model has potential for teaching basic principles in eyelid surgery including upper lid blepharoplasty, aponeurotic ptosis repair, upper lid gold weight lid loading for facial paralysis, lateral canthotomy and inferior limb cantholysis, lower lid tightening, and transconjunctival approach to the orbital floor. Eye muscle advancement, optic nerve sheath fenestration, and enucleation also accurately simulated human surgery. Anatomic variations limit the sheep model for orbital floor reconstruction and lacrimal drainage procedures. CONCLUSIONS The sheep head and neck provide an inexpensive, safe model for developing skills in several oculoplastic procedures. Formal simulation testing is needed to confirm these expert opinions.
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Affiliation(s)
- Glenn Isaacson
- Departments of Otolaryngology-Head and Neck Surgery, 12314Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA.,Departments of Pediatrics, 12314Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Allan E Wulc
- Department of Ophthalmology, 12312Drexel University College of Medicine, Philadelphia, PA, USA.,Department of Ophthalmology, 14640University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
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Wijaya AN, Margiana R, Kusumaningtyas S, Furqonita D. Comparison of decomposition rate of hind limbs of preserved mice with ethanol-glycerin and formaldehyde of advanced fixative solution. Anat Cell Biol 2021; 54:225-231. [PMID: 33767018 PMCID: PMC8225480 DOI: 10.5115/acb.20.314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 02/22/2021] [Accepted: 02/22/2021] [Indexed: 12/03/2022] Open
Abstract
Learning anatomy in medical school is still closely based on the use of cadavers. The burial of preserved cadaver poses a problem, specifically, it contaminates the soil with formalin. Many studies have been conducted to find an alternative fixative to update or modify formalin usage. One of them is ethanol-glycerin (EG), which suggests promising results. Despite that fact, there has yet to be any research comparing the decomposition rate between EG and formalin. This study is conducted to compare the rate of decomposition between the two fixative solutions, EG and 4% formalin on the hind limb of mice. The mice were first preserved using a standard primary fixative solution which is 10% formalin, following that procedure is preservation using advanced fixative solution, EG or 4% formalin. Upon completing the preservation steps, the mice were buried for 6 weeks and observed weekly. The stages of decomposition were assessed semi-quantitatively depending on its appearance. The hind limbs of mice that were fixed with EG solution managed to reach the last stage of decomposition, dry & remains, while the 4% formalin group of mice still remained in the previous stage, advanced decay. It is concluded that the mice hind limbs that have been previously preserved with EG advanced fixative solution has a faster decomposition rate compared to 4% formalin.
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Affiliation(s)
- Amanda Natalie Wijaya
- Undergraduate Program of Medical Education, Faculty of Medicine, Universitas Indonesia, Jakarta
| | - Ria Margiana
- Department of Anatomy, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | | | - Deswaty Furqonita
- Department of Anatomy, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
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Halm S, Haberthür D, Eppler E, Djonov V, Arnold A. Micro-CT imaging of Thiel-embalmed and iodine-stained human temporal bone for 3D modeling. J Otolaryngol Head Neck Surg 2021; 50:33. [PMID: 34078459 PMCID: PMC8173723 DOI: 10.1186/s40463-021-00522-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 05/17/2021] [Indexed: 12/14/2022] Open
Abstract
Introduction This pilot study explores whether a human Thiel-embalmed temporal bone is suitable for generating an accurate and complete data set with micro-computed tomography (micro-CT) and whether solid iodine-staining improves visualization and facilitates segmentation of middle ear structures. Methods A temporal bone was used to verify the accuracy of the imaging by first digitally measuring the stapes on the tomography images and then physically under the microscope after removal from the temporal bone. All measurements were compared with literature values. The contralateral temporal bone was used to evaluate segmentation and three-dimensional (3D) modeling after iodine staining and micro-CT scanning. Results The digital and physical stapes measurements differed by 0.01–0.17 mm or 1–19%, respectively, but correlated well with the literature values. Soft tissue structures were visible in the unstained scan. However, iodine staining increased the contrast-to-noise ratio by a factor of 3.7 on average. The 3D model depicts all ossicles and soft tissue structures in detail, including the chorda tympani, which was not visible in the unstained scan. Conclusions Micro-CT imaging of a Thiel-embalmed temporal bone accurately represented the entire anatomy. Iodine staining considerably increased the contrast of soft tissues, simplified segmentation and enabled detailed 3D modeling of the middle ear. Supplementary Information The online version contains supplementary material available at 10.1186/s40463-021-00522-0.
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Affiliation(s)
- Sebastian Halm
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, CH-3012, Bern, Switzerland.
| | - David Haberthür
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, CH-3012, Bern, Switzerland
| | - Elisabeth Eppler
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, CH-3012, Bern, Switzerland
| | - Valentin Djonov
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, CH-3012, Bern, Switzerland
| | - Andreas Arnold
- University of Bern, Hochschulstrasse 6, CH-3012, Bern, Switzerland.,Department of Ear Nose Throat, Spital Münsingen, Krankenhausweg 18/20, CH-3110, Münsingen, Switzerland
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Tomlinson J, Ondruschka B, Prietzel T, Zwirner J, Hammer N. A systematic review and meta-analysis of the hip capsule innervation and its clinical implications. Sci Rep 2021; 11:5299. [PMID: 33674621 PMCID: PMC7935927 DOI: 10.1038/s41598-021-84345-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Accepted: 12/22/2020] [Indexed: 12/27/2022] Open
Abstract
Detailed understanding of the innervation of the hip capsule (HC) helps inform surgeons' and anaesthetists' clinical practice. Post-interventional pain following radiofrequency nerve ablation (RFA) and dislocation following total hip arthroplasty (THA) remain poorly understood, highlighting the need for more knowledge on the topic. This systematic review and meta-analysis focuses on gross anatomical studies investigating HC innervation. The main outcomes were defined as the prevalence, course, density and distribution of the nerves innervating the HC and changes according to demographic variables. HC innervation is highly variable; its primary nerve supply seems to be from the nerve to quadratus femoris and obturator nerve. Many articular branches originated from muscular branches of the lumbosacral plexus. It remains unclear whether demographic or anthropometric variables may help predict potential differences in HC innervation. Consequently, primary targets for RFA should be the anterior inferomedial aspect of the HC. For THA performed on non-risk patients, the posterior approach with capsular repair appears to be most appropriate with the lowest risk of articular nerve damage. Care should also be taken to avoid damaging vessels and muscles of the hip joint. Further investigation is required to form a coherent map of HC innervation, utilizing combined gross and histological investigation.
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Affiliation(s)
- Joanna Tomlinson
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, Otago, New Zealand.
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Torsten Prietzel
- Department of Orthopaedics, Trauma and Reconstructive Surgery, Zeisigwaldkliniken Bethanien, Chemnitz, Saxony, Germany
- Department of Orthopaedic, Trauma and Plastic Surgery, University of Leipzig, Leipzig, Saxony, Germany
| | - Johann Zwirner
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, Otago, New Zealand
- Institute of Legal Medicine, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Niels Hammer
- Institute of Macroscopic and Clinical Anatomy, University of Graz, Graz, Styria, Austria.
- Department of Orthopaedic, Trauma and Plastic Surgery, University of Leipzig, Leipzig, Saxony, Germany.
- Division of Medical Technology, Fraunhofer Institute for Machine Tools and Forming Technology (Fraunhofer IWU), Dresden, Saxony, Germany.
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Kulow C, Reske A, Leimert M, Bechmann I, Winter K, Steinke H. Topography and evidence of a separate "fascia plate" for the femoral nerve inside the iliopsoas - A dorsal approach. J Anat 2020; 238:1233-1243. [PMID: 33368226 PMCID: PMC8053587 DOI: 10.1111/joa.13374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/13/2020] [Accepted: 11/16/2020] [Indexed: 11/27/2022] Open
Abstract
The femoral nerve stretch test is an essential part of clinical neurological examinations. This test is performed alongside Magnetic Resonance Imaging (MRI) to determine if there is any evidence of nerve root irritation, usually as a consequence of disc prolapse. The test occasionally gives false positive results. Why such false positives can occur, is subject to continued research, however, no obvious reason has yet emerged. We hypothesize that connectives of the femoral nerve may explain such a phenomenon. To see these connectives, we approached the femoral nerve from dorsal in 12 cases. With the use of ink injection into the subparaneural compartment of the femoral nerve and dissections, a thin transparent structure can clearly be seen that is separate from the epineurium, perineurium, and a paraneural sheath. A continuation of the paraneural sheath produces a fascia plate approximately 1.5 cm in width and with a thickness of around 3 mm, which not only circumnavigates the nerve but projects into the surrounding tissues. Our qualitative observations show that not only does this femoral nerve fascia plate exists, but it also contains nerves and vessels. Furthermore, we show that the femoral nerve is connected to the myofascial complex of the iliopsoas, and in a separate fascia plate from the iliopsoas fascia. This plate is a hitherto neglected connective which extends as far as the spinal dura mater. Evidence from our plastinates and histological sections suggests that when tension is applied to the femoral nerve during the femoral nerve stretch test, tension is also applied to the femoral nerve fascia plate. The femoral nerve fascia plate could be a specific factor that contributes to pain resulting in a false positive femoral nerve stretch test.
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Affiliation(s)
- Charlotte Kulow
- Institut für Anatomie, Universität Leipzig, Leipzig, Germany
| | - Andreas Reske
- Department of Anesthesiology, Intensive Care Medicine, Heinrich-Braun- Hospital, Zwickau, Germany
| | | | - Ingo Bechmann
- Institut für Anatomie, Universität Leipzig, Leipzig, Germany
| | - Karsten Winter
- Institut für Anatomie, Universität Leipzig, Leipzig, Germany
| | - Hanno Steinke
- Institut für Anatomie, Universität Leipzig, Leipzig, Germany
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Sanchez-Ferrer ML, Grimbizis G, Nisolle M, Salmeron-González E, Gómez-Pérez L, Sánchez del Campo F, Acién M. Could Training in an Anatomical Model Be Useful to Teach Different Neovagina Surgical Techniques? A Descriptive Study about Knowledge and Experience of Techniques for Neovagina Surgery. J Clin Med 2020; 9:jcm9113722. [PMID: 33228242 PMCID: PMC7699514 DOI: 10.3390/jcm9113722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/11/2020] [Accepted: 11/17/2020] [Indexed: 11/16/2022] Open
Abstract
Neovagina surgery in patients with vaginal agenesis is rare. No consensus exists regarding the best surgical technique. The aims of the current study were to show a new Thiel-embalmed cadaveric model to teach the surgical steps for different techniques of neovagina surgery and to evaluate opinions of this surgical teaching procedure. Four techniques-modified McIndoe, Vecchietti, Davydov, and vulvoperineal pediculated flaps-were recorded using an external camera and/or laparoscopic vision during their execution in a dissection room on "feminized" male cadavers. To determine the opinion of this teaching model, we designed an anonymous online survey that was available to participants via a computer application. After watching the video, more than 92% of participants agreed that feminized male cadavers were an excellent procedure for teaching these surgical techniques. Before watching this video, the most employed techniques were the McIndoe and Vecchietti procedures. After watching the video, modified McIndoe and vulvoperineal flaps were preferred by participants because they were considered to be easier to perform. It was considered that this model was useful for training neovagina techniques and, moreover, it should be recommended before techniques were performed on a real patient. Further investigation is needed to validate this model.
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Affiliation(s)
- María Luísa Sanchez-Ferrer
- Department of Obstetrics & Gynecology, “Virgen de la Arrixaca” University Clinical Hospital, 30120 El Palmar (Murcia), Spain
- Institute for Biomedical Research of Murcia, IMIB-Arrixaca, 30120 El Palmar (Murcia), Spain
- Correspondence: ; Tel.: +34-(86)-8889486
| | - Grigoris Grimbizis
- First Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece;
| | - Michele Nisolle
- Department of Obstetrics and Gynecology, University of Liège, CHR Liège, 4000 Liège, Belgium;
| | - Enrique Salmeron-González
- Plastic Surgery and Burns Service, University and Polytechnic Hospital La Fe, 46026 Valencia, Spain;
| | - Luis Gómez-Pérez
- Department of Urology, “San Juan” University Clinical Hospital, University Miguel Hernández, 03550 Alicante, Spain;
| | | | - Maribel Acién
- Department of Obstetrics & Gynecology, “San Juan” University Clinical Hospital, University Miguel Hernández, 03550 Alicante, Spain;
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Crosado B, Löffler S, Ondruschka B, Zhang M, Zwirner J, Hammer N. Phenoxyethanol-Based Embalming for Anatomy Teaching: An 18 Years' Experience with Crosado Embalming at the University of Otago in New Zealand. ANATOMICAL SCIENCES EDUCATION 2020; 13:778-793. [PMID: 31758863 PMCID: PMC7687111 DOI: 10.1002/ase.1933] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 10/28/2019] [Accepted: 11/19/2019] [Indexed: 05/08/2023]
Abstract
Embalming fixatives such as formaldehyde and phenol have been associated with occupational health hazards. While anatomists aim at replacing these chemicals, this seems presently unfeasible in particular for formaldehyde. Furthermore, fixation protocols usually require well-equipped facilities with highly experienced staff to achieve good fixation results in spite of only a minimal use of formaldehyde. Combining these aspects, a technique robust enough to be carried out by morticians is presented, resulting in durable tissues with minimal formaldehyde use. An embalming protocol involving phenoxyethanol was established, using concentrations of 7 and 1.5 Vol% of phenoxyethanol in the fixative and the conservation fluid, respectively. Visual, haptic, histological, and biomechanical properties and their perceived potential to positively influence student learning outcomes were compared to standard embalming techniques. The phenoxyethanol technique provides esthetic, durable, and odorless tissues. Bleaching is less pronounced compared to ethanol- or formaldehyde-based protocols. The tissues remain pliable following the phenoxyethanol-based embalming and can be used for biomechanical experiments to some extent. Phenoxyethanol-fixed tissues are well suited for undergraduate teaching with perceived positive learning outcomes and partly for postgraduate training. Phenoxyethanol tissues provide the option to obtain well-preserved histology samples, similar to those derived from formaldehyde. The provided protocol helps replace the use of phenol and formaldehyde for conservation purposes and minimizes the use of formaldehyde for the initial injection fixation. Phenoxyethanol-based embalming forms an effective alternative to standard embalming techniques for human cadavers. It is simple to use, allowing fixation procedures to be carried out in less sophisticated facilities with non-anatomy staff.
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Affiliation(s)
| | - Sabine Löffler
- Department of AnatomyUniversity of LeipzigLeipzigGermany
| | | | - Ming Zhang
- Department of AnatomyUniversity of OtagoDunedinNew Zealand
| | - Johann Zwirner
- Department of AnatomyUniversity of OtagoDunedinNew Zealand
| | - Niels Hammer
- Department of Clinical and Macroscopic AnatomyMedical University of GrazGrazAustria
- Department of Trauma, Orthopedic and Plastic SurgeryUniversity Hospital of LeipzigLeipzigGermany
- Fraunhofer Institute for Machine Tools and Forming TechnologyDresdenGermany
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Siwetz M, Hammer N, Ondruschka B, Kieser DC. Variations in Subscapularis Muscle Innervation-A Report on Case Series. ACTA ACUST UNITED AC 2020; 56:medicina56100532. [PMID: 33053880 PMCID: PMC7601857 DOI: 10.3390/medicina56100532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/29/2020] [Accepted: 10/10/2020] [Indexed: 11/16/2022]
Abstract
Background and objectives: The subscapularis muscle is typically innervated by two distinct nerve branches, namely the upper and lower subscapular nerve. These usually originate from the posterior cord of the brachial plexus. A large number of variations have been described in previous literature. Materials and Methods: Dissection was carried out in 31 cadaveric specimens. The frequency of accessory subscapular nerves was assessed and the distance from the insertion points of these nerves to the myotendinous junction was measured. Results: Accessory subscapular nerves were found in three cases (9.7%). According to their origin from the posterior cord of the brachial plexus proximal to the thoracodorsal nerve all three nerves were identified as accessory upper subscapular nerves. No accessory lower subscapular nerves were found. Conclusion: Accessory nerves occur rather commonly and need to be considered during surgery, nerve blocks, and imaging procedures.
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Affiliation(s)
- Martin Siwetz
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria;
| | - Niels Hammer
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria;
- Fraunhofer IWU, Medical Branch, 01187 Dresden, Germany
- Department of Orthopedic and Trauma Surgery, University of Leipzig, 04109 Leipzig, Germany
- Correspondence: or ; Tel.: +43-316-385-71100
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, 22529 Hamburg, Germany;
| | - David C. Kieser
- Department of Orthopaedic Surgery and Musculoskeletal Medicine, University of Otago, 8140 Christchurch, New Zealand;
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Zwirner J, Scholze M, Ondruschka B, Hammer N. What is Considered a Variation of Biomechanical Parameters in Tensile Tests of Collagen-Rich Human Soft Tissues? - Critical Considerations Using the Human Cranial Dura Mater as a Representative Morpho-Mechanic Model. MEDICINA (KAUNAS, LITHUANIA) 2020; 56:E520. [PMID: 33027931 PMCID: PMC7600870 DOI: 10.3390/medicina56100520] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 09/27/2020] [Accepted: 09/28/2020] [Indexed: 12/23/2022]
Abstract
Background and Objectives: Profound knowledge on the load-dependent behavior of human soft tissues is required for the development of suitable replacements as well as for realistic computer simulations. Regarding the former, e.g., the anisotropy of a particular biological tissue has to be represented with site- and direction-dependent particular mechanical values. Contrary to this concept of consistent mechanical properties of a defined soft tissue, mechanical parameters of soft tissues scatter considerably when being determined in tensile tests. In spite of numerous measures taken to standardize the mechanical testing of soft tissues, several setup- and tissue-related factors remain to influence the mechanical parameters of human soft tissues to a yet unknown extent. It is to date unclear if measurement extremes should be considered a variation or whether these data have to be deemed incorrect measurement outliers. This given study aimed to determine mechanical parameters of the human cranial dura mater as a model for human soft tissues using a highly standardized protocol and based on this, critically evaluate the definition for the term mechanical "variation" of human soft tissue. Materials and Methods: A total of 124 human dura mater samples with an age range of 3 weeks to 94 years were uniformly retrieved, osmotically adapted and mechanically tested using customized 3D-printed equipment in a quasi-static tensile testing setup. Scanning electron microscopy of 14 samples was conducted to relate the mechanical parameters to morphological features of the dura mater. Results: The here obtained mechanical parameters were scattered (elastic modulus = 46.06 MPa, interquartile range = 33.78 MPa; ultimate tensile strength = 5.56 MPa, interquartile range = 4.09 MPa; strain at maximum force = 16.58%, interquartile range = 4.81%). Scanning electron microscopy revealed a multi-layered nature of the dura mater with varying fiber directions between its outer and inner surface. Conclusions: It is concluded that mechanical parameters of soft tissues such as human dura mater are highly variable even if a highly standardized testing setup is involved. The tissue structure and composition appeared to be the main contributor to the scatter of the mechanical parameters. In consequence, mechanical variation of soft tissues can be defined as the extremes of a biomechanical parameter due to an uncontrollable change in tissue structure and/or the respective testing setup.
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Affiliation(s)
- Johann Zwirner
- Department of Anatomy, University of Otago, Dunedin 9016, New Zealand
| | - Mario Scholze
- Institute of Materials Science and Engineering, Chemnitz University of Technology, 09125 Chemnitz, Germany;
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, 22529 Hamburg, Germany;
| | - Niels Hammer
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria
- Department of Orthopaedic and Trauma Surgery, University of Leipzig, 04103 Leipzig, Germany
- Fraunhofer IWU, 01187 Dresden, Germany
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Ackermann J, Wedel T, Holthaus B, Bojahr B, Hackethal A, Brucker S, Biebl M, Westermann M, Günther V, Krüger M, Maass N, Mettler L, Peters G, Alkatout I. Didactic Benefits of Surgery on Body Donors during Live Surgery Events in Minimally Invasive Surgery. J Clin Med 2020; 9:jcm9092912. [PMID: 32917056 PMCID: PMC7563950 DOI: 10.3390/jcm9092912] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/04/2020] [Accepted: 09/07/2020] [Indexed: 12/11/2022] Open
Abstract
Background: Live surgery events serve as a valuable tool for surgical education, but also raise ethical concerns about patient safety and professional performance. In the present study, we evaluate the technical feasibility and didactic benefits of live surgery on body donors compared to real patients. Methods: A live surgery session performed on a body donor’s cadaver embalmed in ethanol–glycerol–lysoformin was integrated into the live surgery program presented at a major gynecological convention of minimally invasive surgery. Surgical procedures carried out in real patients were paralleled in the body donor, including the dissection and illustration of surgically relevant anatomical landmarks. A standardized questionnaire was filled by the participants (n = 208) to evaluate the appropriateness, effectiveness, and benefits of this novel concept. Results: The live surgery event was appreciated as a useful educational tool. With regard to the use of body donors, authenticity was rated high (85.5%), and the overall value of body donors for surgical education and training was rated very high (95.0%). The didactic benefit of simultaneous operations performed on body donors and real patients was considered particularly useful (95.5%), whereas complete replacement of real patients by body donors was not favored (14.5%). Conclusions: The study demonstrated both the technical feasibility and didactic benefits of performing minimally invasive surgery in body donors as part of live surgery events. This novel concept has the potential to enhance anatomical knowledge, providing insights into complex surgical procedures, and may serve to overcome yet unresolved ethical concerns related to live surgery events.
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Affiliation(s)
- Johannes Ackermann
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Thilo Wedel
- Institute of Anatomy, Christian-Albrechts University Kiel, Otto-Hahn-Platz 8, 24118 Kiel, Germany;
| | - Bernd Holthaus
- Clinic of Obstetrics and Gynecology, St. Elisabeth Hospital, 49401 Damme, Germany;
| | - Bernd Bojahr
- Clinic of Minimally Invasive Surgery, Kurstraße 11, 14129 Berlin-Zehlendorf, Germany;
| | | | - Sara Brucker
- Department für Frauengesundheit, University Hospital Tübingen, Calwer Straße 7, 72076 Tübingen, Germany;
| | - Matthias Biebl
- Department of Surgery, Campus Virchow Klinikum, Charité - Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany;
| | - Martina Westermann
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Veronika Günther
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Magret Krüger
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Nicolai Maass
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Liselotte Mettler
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Göntje Peters
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
| | - Ibrahim Alkatout
- Department of Obstetrics and Gynecology, Kiel School of Gynaecological Endoscopy, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller Str. 3, House C, 24105 Kiel, Germany; (J.A.); (M.W.); (V.G.); (M.K.); (N.M.); (L.M.); (G.P.)
- Correspondence: ; Tel.: +49-431-500-21450
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Czerwonatis S, Dehghani F, Steinke H, Hepp P, Bechmann I. Nameless in anatomy, but famous among surgeons: The so called “deltotrapezoid fascia”. Ann Anat 2020; 231:151488. [DOI: 10.1016/j.aanat.2020.151488] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 02/06/2020] [Accepted: 02/08/2020] [Indexed: 11/28/2022]
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Watanabe M, Yoneyama Y, Hamada H, Kohno M, Hasegawa O, Takahashi H, Kawase-Koga Y, Matsuo A, Chikazu D, Kawata S, Itoh M. The Usefulness of Saturated Salt Solution Embalming Method for Oral Surgical Skills Training: A New Cadaveric Training Model for Bone Harvesting. ANATOMICAL SCIENCES EDUCATION 2020; 13:628-635. [PMID: 31608585 DOI: 10.1002/ase.1925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 07/24/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
The purpose of this study was to assess the usefulness of saturated salt solution-embalmed cadavers for oral surgical skills training related to bone graft harvesting. Two half-day surgical skills training workshops were held at the Tokyo Medical University utilizing eight cadavers embalmed with the saturated salt solution. A total of 22 participants including oral surgeons, residents, and dentists attended the workshop. Surgical training consisted of six procedures related to intraoral and extraoral bone harvesting. The participants were surveyed to assess self-confidence levels for each surgical procedure before and after completion of each workshop. The Wilcoxon signed-rank test was used to compare the differences between each median score before and after the workshop. There were statistically significant increases in the self-assessed confidence scores in bone harvesting procedures for the zygomatic bone (P = 0.003), maxillary tuberosity (P = 0.002), and other sites (P < 0.001). The anatomical features of saturated salt solution-embalmed cadavers were also examined. The textures of the oral mucosa and skin were similar to those of living individuals. The structure of bone tissues was well-preserved and the hardness was realistic. Consequently, all procedures were performed with sufficient realism. The saturated salt solution method has a relatively low cost of preparation and storage, and almost no odor. The authors suggest that saturated salt solution-embalmed cadavers could provide a new model for oral surgical skills training in bone harvesting.
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Affiliation(s)
- Masato Watanabe
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - Yuya Yoneyama
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - Hayato Hamada
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Ibaraki Medical Center, Ibaraki, Japan
| | - Michihide Kohno
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - On Hasegawa
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - Hidetoshi Takahashi
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - Yoko Kawase-Koga
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - Akira Matsuo
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Ibaraki Medical Center, Ibaraki, Japan
| | - Daichi Chikazu
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University Hospital, Tokyo, Japan
| | - Shinichi Kawata
- Department of Anatomy, Tokyo Medical University, Tokyo, Japan
| | - Masahiro Itoh
- Department of Anatomy, Tokyo Medical University, Tokyo, Japan
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Choi JJE, Zwirner J, Ramani RS, Ma S, Hussaini HM, Waddell JN, Hammer N. Mechanical properties of human oral mucosa tissues are site dependent: A combined biomechanical, histological and ultrastructural approach. Clin Exp Dent Res 2020; 6:602-611. [PMID: 32618130 PMCID: PMC7745080 DOI: 10.1002/cre2.305] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/16/2020] [Accepted: 05/18/2020] [Indexed: 11/20/2022] Open
Abstract
Aim To investigate load‐deformation properties of Thiel‐embalmed human oral mucosa tissues and to compare three different anatomical regions in terms of mechanical, histological and ultrastructural characteristic with focus on the extracellular matrix. Materials and Methods Thirty specimens from three different regions of the oral cavity: attached gingiva, buccal mucosa and the hard palate were harvested from two Thiel‐embalmed cadavers. Mechanical properties were obtained, combining strain evaluation and digital image correlation in a standardised approach. Elastic modulus, tensile strength, strain at maximum load and strain to failure were computed and analysed statistically. Subsamples were also analysed using scanning electron microscopy (SEM) and histological analysis. Results The highest elastic modulus of 37.36 ± 17.4 MPa was found in the attached gingiva group, followed by the hard palate and buccal mucosa. The elastic moduli of attached gingiva differed significantly to the buccal mucosa (p = .01) and hard palate (p = .021). However, there was no difference in the elastic moduli between the buccal mucosa and hard palate (p > .22). The tensile strength of the tissue samples ranged from 1.54 ± 0.5MPa to 3.81 ± 0.9 MPa, with a significant difference between gingiva group and buccal mucosa or hard palate (p = .001). No difference was found in the mean tensile strength between the buccal mucosa and hard palate (p = .92). Ultrastructural imaging yielded a morphological basis for the various mechanical properties found intraorally; the attached gingiva showed unidirectional collagen fibre network whereas the buccal mucosa and hard palate showed multi‐directional network, which was more prone to tension failure and less elasticity. Conclusion This is the first study assessing the various morphological‐mechanical relationships of intraoral soft tissues, utilising Thiel‐embalmed tissues. The findings of this study suggest that the tissues from different intraoral regions showed various morphological‐mechanical behaviour which was also confirmed under the SEM and in the histological analysis.
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Affiliation(s)
- Joanne Jung Eun Choi
- Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - Johann Zwirner
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Rishi Sanjay Ramani
- Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - Sunyoung Ma
- Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - Haizal Mohd Hussaini
- Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - John Neil Waddell
- Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - Niels Hammer
- Department of Clinical and Macroscopic Anatomy, Medical University of Graz, Graz, Austria.,Department of Trauma, Orthopedic and Plastic Surgery, University Hospital of Leipzig, Leipzig, Germany.,Fraunhofer IWU, Dresden, Germany
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Halm S, Fairhurst PG, Tschanz S, Wieland FAM, Djonov V, Krause F. Effect of Lateral Sliding Calcaneus Osteotomy on Tarsal Tunnel Pressure. FOOT & ANKLE ORTHOPAEDICS 2020; 5:2473011420931015. [PMID: 35097388 PMCID: PMC8697189 DOI: 10.1177/2473011420931015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: Lateral sliding calcaneus osteotomies are common procedures to correct hindfoot varus deformities. Shifting the calcaneal tuberosity laterally (lateralization) can lead to tarsal tunnel pressure increase and tibial nerve palsy. The purpose of this cadaveric biomechanical study was to investigate the correlation of lateralization and pressure increase underneath the flexor retinaculum. Methods: The pressure in the tarsal tunnel of 12 Thiel-fixated human cadaveric lower legs was measured in different foot positions and varying degrees of calcaneal lateralization. Results: The mean pressure increased from plantarflexion (PF) to neutral position (NP) and from NP to hindfoot dorsiflexion (DF), and with increasing amounts of lateralization of the calcaneal tuberosity. The mean baseline pressure in PF was 1.5, in NP 2.2, and in DF 6.5 mmHg and increased to 8.1 in PF, 18.4 in NP, and 33.1 mmHg with 12 mm of lateralization. The release of the flexor retinaculum significantly lowered the pressure. Conclusion: Increasing pressures were found in the tarsal tunnel with increasing lateralization of the tuberosity and with both dorsiflexion and plantarflexion of the ankle. Clinical Relevance: A pre-emptive release of the flexor retinaculum for a lateralization of the calcaneal tuberosity of more than 8 mm should be considered, especially if specific patient risk factors are present. No tibial nerve palsy should be expected with 4 mm of lateralization.
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Affiliation(s)
- Sebastian Halm
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | - Paul G. Fairhurst
- Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Stefan Tschanz
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | | | | | - Fabian Krause
- Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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Poilliot A, Tannock M, Zhang M, Zwirner J, Hammer N. Quantification of fat in the posterior sacroiliac joint region applying a semi-automated segmentation method. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2020; 191:105386. [PMID: 32088491 DOI: 10.1016/j.cmpb.2020.105386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/01/2019] [Accepted: 02/09/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND AND OBJECTIVE Fat within the posterior sacroiliac joint region (PSIJ) is thought to compensate for the incongruent surfaces of the sacrum and ilium posteriorly. Knowledge on the presence of fat in the SIJ could provide useful information about joint physiology and clinical kinematic implications of its presence. This study aimed at quantifying fat within the PSIJ, using a semi-automated method, and to compare the results to a manual segmentation method based on data from frozen cadaveric sections and computed tomography (CT). The results may provide a quicker and more objective method for fat volume quantification. METHODS Seventy-eight cadaveric hemipelves were used. Frozen sections were obtained and photographed and CT data obtained from subsamples. A MATLAB routine was deployed to assess fat in the serial sections and CT scans, using masks derived from color thresholds and Hounsfield units, respectively. Regions of interest were created to isolate the PSIJ region before fat volume was computed. A Friedman test was used for the comparison between all masks and the manual method, a Kruskall-Wallis test for comparing the CT results with all masks and the manual method and Bland-Altman plots were used to express the result differences of these methods. RESULTS PSIJ fat volume averaged 3.9 ± 2.2, 4.9 ± 2.5, 3.7 ± 2.3 and 7.2 ± 7.3 cm3 for masks 1 (fat mask), 2 (no-fat mask), 3 ('control' fat mask) and CT, respectively. All masks and the CT fat volume were significantly different to the manual segmentation method (p<0.01). Mask 2 differed significantly from masks 1 and 3 (both p<0.01). Bland-Altman plots yielded differences in the measurements between the various methods. CONCLUSIONS Manual segmentation of PSIJ fat volume may result in a relative underestimation of the total fat compared to semi-automated or CT-based methods, as fat might not be sufficiently distinguished from surrounding structures. However, the CT-based method resulted in vastly higher variation in the results and warrants further study. The semi-automated approach to quantify fat based on color thresholds presented here is more investigator-independent, time efficient and applicable to CT scans, which provides opportunity to use this technique on various tissue types in vivo.
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Affiliation(s)
- Amélie Poilliot
- Department of Anatomy, University of Otago, Dunedin, New Zealand.
| | - Murray Tannock
- Department of Computer Science, University of Otago, Dunedin, New Zealand.
| | - Ming Zhang
- Department of Anatomy, University of Otago, Dunedin, New Zealand.
| | - Johann Zwirner
- Department of Anatomy, University of Otago, Dunedin, New Zealand.
| | - Niels Hammer
- Department of Clinical and Macroscopic Anatomy, Medical University of Graz, Austria; Department of Orthopedic and Trauma Surgery, University of Leipzig, Germany; Fraunhofer IWU, Dresden, Germany; Department of Machine Tool Design and Forming Technology, Technical University of Chemnitz, Germany.
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Establishment and evaluation of a training course in advanced laparoscopic surgery based on human body donors embalmed by ethanol-glycerol-lysoformin fixation. Surg Endosc 2020; 35:1385-1394. [PMID: 32444969 PMCID: PMC7886762 DOI: 10.1007/s00464-020-07523-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 03/26/2020] [Indexed: 02/05/2023]
Abstract
Background Education of clinical anatomy and training of surgical skills are essential prerequisites for any surgical intervention in patients. Here, we evaluated a structured training program for advanced gynecologic laparoscopy based on human body donors and its impact on clinical practice. Methods The three-step training course included: (1) anatomical and surgical lectures, (2) demonstration and hands-on study of pre-dissected anatomical specimens, and (3) surgical training of a broad spectrum of gynecological laparoscopic procedures on human body donors embalmed by ethanol-glycerin-lysoformin. Two standardized questionnaires (after the course and 6 months later) evaluated the effectiveness of each of the training modules and the benefits to surgical practice. Results Eighty participants took part in 6 training courses using a total number of 24 body donors (3 trainees/body donor). Based on a 91.3% (73/80) response rate, participants rated high or very high the tissue and organ properties of the body donors (n = 72, 98.6%), the technical feasibility to perform laparoscopic surgery (n = 70, 95.9%), and the overall learning success (n = 72, 98.6%). Based on a 67.5% (54/80) response rate at 6 months, participants rated the benefit of the course to their daily routine as very high (mean 80.94 ± 24.61%, n = 53), and this correlated strongly with the use of body donors (r = 0.74) and the ability to train laparoscopic dissections (r = 0.77). Conclusions This study demonstrates the technical feasibility and didactic effectiveness of laparoscopic training courses in a professional and true-to-life setting by using ethanol-glycerol-lysoformin embalmed body donors. This cost-efficient fixation method offers the option to integrate advanced surgical training courses into structured postgraduate educational curricula to meet both the technical demands of minimal invasive surgery and the ethical concerns regarding patients´ safety.
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Klima S, Cornwall J, Kieser D, Hammer N. The utility and benefit of a newly established postgraduate training course in surgical exposures for orthopedic and trauma surgery. Arch Orthop Trauma Surg 2019; 139:1673-1680. [PMID: 31041521 DOI: 10.1007/s00402-019-03189-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Limited data exist on specialty surgical cadaver courses for graduates, their skill gain, and whether the course contents are transferable to other surgical disciplines. AIM We present the details on the establishment of a specialist trauma and orthopedics approach course, and explore educational and career outcomes from this program. METHODS A 3-day surgical approach course was developed, including a dissection program utilizing Thiel embalmed cadavers. The course was accredited with the local orthopedics association. Participants were assessed by survey on acquired surgical knowledge, skill, decision-making, confidence, and on self-development and effect on career. RESULTS Thirty-one participants successfully completed the courses over 3 years. Increases in surgical skill, knowledge, surgical decision-making and confidence were reported. Skills and confidence also positively impacted on other surgical disciplines. Courses rated highly for learning outcomes; comments highlighted usefulness, applicability, and practicing opportunities, while also impacting positively on career opportunities. CONCLUSION Surgical courses have shown being useful for the acquisition of skills, knowledge, confidence and decision-making, with a positive impact on confidence and decision-making. This information is relevant to future participants, benefactors, surgical programs, and tertiary institutions who want to establish specialist surgical courses.
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Affiliation(s)
- Stefan Klima
- Department of Anatomy, University of Otago, Lindo Ferguson Building, 270 Great King St, Dunedin, 9016, New Zealand.,Department of Trauma, Orthopedic and Plastic Surgery, University Hospital of Leipzig, Leipzig, Germany.,Orthopedicus Clinics, Leipzig, Germany
| | - Jon Cornwall
- Center for Early Learning in Medicine, University of Otago, Dunedin, New Zealand
| | - David Kieser
- Department of Orthopedic Surgery and MSM, Christchurch Hospital, Christchurch, New Zealand
| | - Niels Hammer
- Department of Anatomy, University of Otago, Lindo Ferguson Building, 270 Great King St, Dunedin, 9016, New Zealand. .,Department of Trauma, Orthopedic and Plastic Surgery, University Hospital of Leipzig, Leipzig, Germany. .,Medical Division, Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany.
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Beger O, Karagül Mİ, Koç T, Kayan G, Cengiz A, Yılmaz ŞN, Olgunus ZK. Effects of different cadaver preservation methods on muscles and tendons: a morphometric, biomechanical and histological study. Anat Sci Int 2019; 95:174-189. [DOI: 10.1007/s12565-019-00508-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/28/2019] [Indexed: 12/29/2022]
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McDougall S, Soames R, Felts P. Thiel embalming: Quantifying histological changes in skeletal muscle and tendon and investigating the role of boric acid. Clin Anat 2019; 33:696-704. [PMID: 31591790 DOI: 10.1002/ca.23491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 09/16/2019] [Accepted: 09/24/2019] [Indexed: 11/07/2022]
Abstract
Cadaver preservation methods impact their utilization in anatomical research and teaching. Thiel-embalmed cadavers show flexibility, however, the cause remains poorly understood. This study aimed to (1) describe qualitative and quantitative histological differences between Thiel-embalmed and formalin-fixed skeletal muscle and tendon tissue; (2) investigate whether boric acid in Thiel solution is solely responsible for modification of tissues; and (3) explore whether the modifications observed could potentially explain the mechanisms underpinning flexibility of Thiel cadavers. Skeletal muscle and tendon samples were harvested from mice preserved using formalin, Thiel solution, or modified-Thiel solution (without boric acid). Using standard H&E and Gomori's trichrome histological methods, tissues were examined to determine whether differences were apparent between the preservative treatments. Differences were present between the Thiel and formalin-fixed tissues; formalin-fixed samples remained substantially more intact while Thiel-embalmed samples showed fiber fragmentation and lack of nuclei. The mean cell diameter of Thiel-embalmed muscle (24.4 μm) was significantly smaller (P < 0.005) than formalin-fixed muscle (40.7 μm). There was significantly greater (P < 0.005) fragmentation in Thiel-embalmed muscle (631.5 per 1 mm2 ) compared to formalin-fixed muscle (75.4 per 1 mm2 ). Samples embalmed using modified-Thiel showed a severe lack of integrity within internal tissue structure. This suggests that Thiel solution significantly alters tissue structure at cellular level, with quantitative data demonstrating measurable differences between Thiel and formalin-fixed specimens. While the precise mechanism for these alterations remains unknown, it is shown that boric acid is not the only component of Thiel responsible for degradation of internal tissue structure. Clin. Anat., 33:696-704, 2020. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Seaneen McDougall
- Centre for Anatomy and Human Identification, School of Science and Engineering, University of Dundee, Dow Street, Dundee, Scotland
| | - Roger Soames
- Centre for Anatomy and Human Identification, School of Science and Engineering, University of Dundee, Dow Street, Dundee, Scotland
| | - Paul Felts
- Centre for Anatomy and Human Identification, School of Science and Engineering, University of Dundee, Dow Street, Dundee, Scotland
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