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Meisterhans M, Hagel V, Spirig JM, Fasser MR, Farshad M, Widmer J. The Biomechanics of the Transpedicular Endoscopic Approach. Spine (Phila Pa 1976) 2024; 49:1052-1058. [PMID: 37942817 DOI: 10.1097/brs.0000000000004871] [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: 08/27/2023] [Accepted: 10/31/2023] [Indexed: 11/10/2023]
Abstract
STUDY DESIGN Biomechanical cadaveric study. OBJECTIVE The goal of this study was to analyze the effects of an endoscopic transpedicular approach with different drill diameters (6 and 8 mm) and compare them with the intact native side. In addition, the influence of bone quality on the resistance of the pedicle was investigated. SUMMARY OF BACKGROUND DATA Clinical studies have repeatedly highlighted the benefits of endoscopic transpedicular decompression for downmigrated lumbar disc herniations. However, the biomechanical effects on pedicle stability have not been studied up to now. MATERIALS AND METHODS Twenty-four vertebras originating from four fresh-frozen cadavers were tested under uniaxial compression load in a ramp-to-failure test: (1) the tunneled pedicle on one side, and (2) the native pedicle on the other side. Twelve lumbar vertebrae were assigned to drill diameter of 6 mm and the other 12 to diameter of 8 mm. RESULTS The median ratio of sustained force for the operated side compared with the intact contralateral side is equal to 74% (63-88) for both drill diameters combined. An 8 mm transpedicular approach recorded an axial resistance of 77% (60-88) compared with the intact contralateral side ( P =0.002). A 6 mm approach resulted in an axial resistance of 72% (66-84) compared with the intact opposite side ( P =0.01). No significant difference between the two different drill diameters was recorded ( P =1). For all three subgroups (intact, 8 mm, 6 mm) the Hounsfield units-values and the absolute resistance force showed significant correlations (intact: ρ=0.859; P <0.001; 8 mm: ρ=0.902; P <0.001; 6 mm: ρ=0.835; P <0.001). CONCLUSION The transpedicular approach significantly reduces the axial resistance force of the pedicle, which may lead to pedicle fracture. Bone quality correlated positively with the absolute resistance force of the pedicle, whereas the influence of the drill hole diameter plays only a limited role.
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Affiliation(s)
- Michel Meisterhans
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Vincent Hagel
- University Spine Center Zurich, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- Spine Center, Asklepios Klinik Lindau, Lindau, Germany
| | - José M Spirig
- University Spine Center Zurich, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Marie-Rosa Fasser
- Institute of Biomechanics, Balgrist Campus, ETH Zurich, Zurich, Switzerland
- Spine Biomechanics, Department of Orthopedic Surgery, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Mazda Farshad
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
- University Spine Center Zurich, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Jonas Widmer
- Institute of Biomechanics, Balgrist Campus, ETH Zurich, Zurich, Switzerland
- Spine Biomechanics, Department of Orthopedic Surgery, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
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Burger JA, Becker L, Li Z, Wang Z, Schmidt H, Pumberger M, Schömig F. In idiopathic scoliosis distances of spinal cord to thoracic pedicle are within 2 mm in a large region of the thoracic apex. Sci Rep 2024; 14:14340. [PMID: 38906927 PMCID: PMC11192752 DOI: 10.1038/s41598-024-64971-z] [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: 12/15/2023] [Accepted: 06/14/2024] [Indexed: 06/23/2024] Open
Abstract
Despite a 15% misplacement rate of screws in idiopathic scoliosis surgery, little is known about the relationship between pedicles and nerve structures in the entire thoracic curve. This study aimed to explore the spinal cord's proximity to the pedicle wall at each thoracic vertebra in the entire thoracic curve, while considering different anatomical changes. Spinal cord to medial pedicle distances were measured on magnetic resonance imaging in 73 patients who underwent posterior spinal fusion with pedicle screw instrumentation. Associations with different variables were examined. A total of 51 patients (69.9%) showed a distance within 2 mm at the apex vertebra on the concave side, more than 50% had a distance within 2 mm in the next thoracic vertebra level above and below, and more than 25% two levels above and below. Weak correlations were found between proximity of the spinal cord at the apex vertebra and vertebra's level and Cobb angle on the concave side (r = - 0.310, P = 0.008, r = 0.380, P = 0.001, respectively). These results emphasize the importance of thorough assessment when placing thoracic pedicle screws in idiopathic scoliosis patients. Further research is warranted to develop surgical strategies aimed at preventing potentially neurological complications resulting from screw misplacement.
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Affiliation(s)
- Joost A Burger
- Charité-Universitätsmedizin Berlin, Center for Musculoskeletal Surgery, Charitéplatz 1, 10117, Berlin, Germany.
| | - Luis Becker
- Charité-Universitätsmedizin Berlin, Center for Musculoskeletal Surgery, Charitéplatz 1, 10117, Berlin, Germany
| | - Zhao Li
- Charité-Universitätsmedizin Berlin, Center for Musculoskeletal Surgery, Charitéplatz 1, 10117, Berlin, Germany
| | - Zhen Wang
- Charité-Universitätsmedizin Berlin, Center for Musculoskeletal Surgery, Charitéplatz 1, 10117, Berlin, Germany
| | - Hendrik Schmidt
- Julius Wolff Institute, Berlin Institute of Health at Charité-Universiätsmedizin Berlin, Berlin, Germany
| | - Matthias Pumberger
- Charité-Universitätsmedizin Berlin, Center for Musculoskeletal Surgery, Charitéplatz 1, 10117, Berlin, Germany
| | - Friederike Schömig
- Charité-Universitätsmedizin Berlin, Center for Musculoskeletal Surgery, Charitéplatz 1, 10117, Berlin, Germany
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Lee YS, Cho DC, Kim KT. Navigation-Guided/Robot-Assisted Spinal Surgery: A Review Article. Neurospine 2024; 21:8-17. [PMID: 38569627 PMCID: PMC10992634 DOI: 10.14245/ns.2347184.592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 02/13/2024] [Accepted: 02/17/2024] [Indexed: 04/05/2024] Open
Abstract
The development of minimally invasive spinal surgery utilizing navigation and robotics has significantly improved the feasibility, accuracy, and efficiency of this surgery. In particular, these methods provide improved accuracy of pedicle screw placement, reduced radiation exposure, and shortened learning curves for surgeons. However, research on the clinical outcomes and cost-effectiveness of navigation and robot-assisted spinal surgery is still in its infancy. Therefore, there is limited available evidence and this makes it difficult to draw definitive conclusions regarding the long-term benefits of these technologies. In this review article, we provide a summary of the current navigation and robotic spinal surgery systems. We concluded that despite the progress that has been made in recent years, and the clear advantages these methods can provide in terms of clinical outcomes and shortened learning curves, cost-effectiveness remains an issue. Therefore, future studies are required to consider training costs, variable initial expenses, maintenance and service fees, and operating costs of these advanced platforms so that they are feasible for implementation in standard clinical practice.
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Affiliation(s)
- Young-Seok Lee
- Department of Neurosurgery, Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, Korea
| | - Dae-Chul Cho
- Department of Neurosurgery, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea
| | - Kyoung-Tae Kim
- Department of Neurosurgery, Kyungpook National University Chilgok Hospital, School of Medicine, Kyungpook National University, Daegu, Korea
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Li YD, Lai PL, Hsieh MK, Chen WP, Lee DM, Tsai TT, Tai CL. Influence of various pilot hole profiles on pedicle screw fixation strength in minimally invasive and traditional spinal surgery: a comparative biomechanical study. Front Bioeng Biotechnol 2024; 12:1359883. [PMID: 38380264 PMCID: PMC10877418 DOI: 10.3389/fbioe.2024.1359883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 01/25/2024] [Indexed: 02/22/2024] Open
Abstract
Despite advancements in pedicle screw design and surgical techniques, the standard steps for inserting pedicle screws still need to follow a set of fixed procedures. The first step, known as establishing a pilot hole, also referred to as a pre-drilled hole, is crucial for ensuring screw insertion accuracy. In different surgical approaches, such as minimally invasive or traditional surgery, the method of creating pilot holes varies, resulting in different pilot hole profiles, including variations in size and shape. The aim of this study is to evaluate the biomechanical properties of different pilot hole profiles corresponding to various surgical approaches. Commercially available synthetic L4 vertebrae with a density of 0.16 g/cc were utilized as substitutes for human bone. Four different pilot hole profiles were created using a 3.0 mm cylindrical bone biopsy needle, 3.6 mm cylindrical drill, 3.2-5.0 mm conical drill, and 3.2-5.0 mm conical curette for simulating various minimally invasive and traditional spinal surgeries. Two frequently employed screw shapes, namely, cylindrical and conical, were selected. Following specimen preparation, screw pullout tests were performed using a material test machine, and statistical analysis was applied to compare the mean maximal pullout strength of each configuration. Conical and cylindrical screws in these four pilot hole configurations showed similar trends, with the mean maximal pullout strength ranking from high to low as follows: 3.0 mm cylindrical biopsy needle, 3.6 mm cylindrical drill bit, 3.2-5.0 mm conical curette, and 3.2-5.0 mm conical drill bit. Conical screws generally exhibited a greater mean maximal pullout strength than cylindrical screws in three of the four different pilot hole configurations. In the groups with conical pilot holes, created with a 3.2-5.0 mm drill bit and 3.2-5.0 mm curette, both conical screws exhibited a greater mean maximal pullout strength than did cylindrical screws. The strength of this study lies in its comprehensive comparison of the impact of various pilot hole profiles commonly used in clinical procedures on screw fixation stability, a topic rarely reported in the literature. Our results demonstrated that pilot holes created for minimally invasive surgery using image-guided techniques exhibit superior pullout strength compared to those utilized in traditional surgery. Therefore, we recommend prioritizing minimally invasive surgery when screw implantation is anticipated to be difficult or there is a specific need for stronger screw fixation. When opting for traditional surgery, image-guided methods may help establish smaller pilot holes and increase screw fixation strength.
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Affiliation(s)
- Yun-Da Li
- Department of Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan
- Department of Orthopaedic Surgery, Spine Section, Bone and Joint Research Center, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan
- Department of Orthopedic Surgery, New Taipei Municipal TuCheng Hospital (Built and Operated by Chang Gung Medical Foundation), New Taipei City, Taiwan
| | - Po-Liang Lai
- Department of Orthopaedic Surgery, Spine Section, Bone and Joint Research Center, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Ming-Kai Hsieh
- Department of Orthopaedic Surgery, Spine Section, Bone and Joint Research Center, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Weng-Pin Chen
- Department of Mechanical Engineering, National Taipei University of Technology, Taipei, Taiwan
| | - De-Mei Lee
- Department of Mechanical Engineering, Chang Gung University, Taoyuan, Taiwan
| | - Tsung-Ting Tsai
- Department of Orthopaedic Surgery, Spine Section, Bone and Joint Research Center, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Ching-Lung Tai
- Department of Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan
- Department of Orthopaedic Surgery, Spine Section, Bone and Joint Research Center, Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan
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Peng F, Gao M, Li Q, Jiang Z, Chen F, Sun M, Lai Y, Wang H, Wang X, Li T, Zhang W. Supraspinous ligament arc tangent guided freehand thoracic pedicle screw insertion technique: high parallelism between screws and upper endplate. Front Surg 2023; 10:1219816. [PMID: 37609000 PMCID: PMC10441773 DOI: 10.3389/fsurg.2023.1219816] [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: 05/09/2023] [Accepted: 07/24/2023] [Indexed: 08/24/2023] Open
Abstract
Research objective To propose a technique for placing pedicle screws in the thoracic spine using the Supraspinous ligament Arc Tangent (SLAT) as a guide to increase the safety and stability of screw placement. Content and methods A retrospective analysis of postoperative anteroposterior and lateral x-ray images was performed for 118 patients with thoracic spine diseases who received conventional freehand technique from January 2016 to May 2020 and SLAT-guided technique since June 2020 to present. The diagnoses included thoracic spinal stenosis, deformity, fractures, infections, and tumors. The angle between the screw and the upper endplate was categorized as grade 1 (0°-5°), grade 2 (5°-10°), and grade 3 (>10°). Three surgeons with more than 10 years of experience in spinal surgery measured the angle between the screw and the upper endplate in the lateral view. Chi-square test was used for statistical analysis, and p < 0.05 was considered statistically significant. Results A total of 1315 pedicle screws were placed from T1 to T12 in all patients. In the conventional freehand technique group, 549 screws were grade 1, 35 screws were grade 2, and 23 screws were grade 3. In the SLAT-guided freehand technique group, 685 screws were grade 1, 15 screws were grade 2, and 8 screws were grade 3. The data of each group was p < 0.05 by Chi-squared test, which was statistically significant, indicating that the SLAT-guided freehand technique resulted in a higher rate of parallelism between the screws and the upper endplate. All patients underwent intraoperative neurophysiological monitoring, immediate postoperative neurological examination, postoperative x-ray examination, and assess the eventual recovery. The screws were safe and stable, and no complications related to pedicle screw placement were found. Conclusion The SLAT-guided freehand technique for placing pedicle screws in the thoracic spine can achieve a higher rate of screw-upper endplate parallelism, making screw placement safer and more accurate. Our method provides a convenient and reliable technique for most spinal surgeons, allowing for increased accuracy and safety with less fluoroscopic guidance.
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Affiliation(s)
- Fushuai Peng
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Meng Gao
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Qiang Li
- Department of Radiology, The Second Affiliated Hospital of Shandong First Medical University, Taian, China
| | - Zhensong Jiang
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Fei Chen
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Mingtong Sun
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Yudong Lai
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Haoyu Wang
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Xingpeng Wang
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Tao Li
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Wen Zhang
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
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Wang S, Aikeremu D, Kahaer A, Maimaiti A, Xiao Y, Tuoheti A, Zhang R, Maimaiti X, Guo H, Rexiti P. Anatomical and imaging measurements of the angle between the axis of the lumbar pedicle and lateral isthmus margin and its clinical significance. J Orthop Surg Res 2023; 18:509. [PMID: 37464385 DOI: 10.1186/s13018-023-03983-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 07/05/2023] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND This study aims to explore the measurement of the angle between the axis of the pedicle and the lateral margin of the isthmus on the lumbar spine, and investigate its clinical significance. METHODS The angle was measured on 120 normal adults' X-ray and 25 dry anatomical specimens. 60 screws were placed by junior residents on 6 wet specimens through the freehand technique. 30 screws were placed on one side with their original experience. After learning the techniques mentioned in the study, 30 screws were placed on the other side. The specimens were examined by X-ray and CT, and the angles of the screw paths and the integrity of the pedicle were evaluated. RESULTS The angles of 120 subjects and 25 anatomical specimens show a gradually increasing trend. The differences among each segment were statistically significant (P < 0.05), but the difference in the same segment between the X-ray and the anatomical specimens was not statistically significant (P > 0.05). Furthermore, the differences in L1, L2, and L3 between the two genders were not statistically significant (P > 0.05). However, the angles were larger in female group than in male group in L4 and L5, and the differences were statistically significant (P < 0.05). The difference in the deviation rate of screw placement before and after the learning was statistically significant only in the L5 segment (P < 0.05). The difference in overall excellence rate was statistically significant (P < 0.05). CONCLUSIONS The measurement of the angle between the axis of the pedicle and the lateral margin of the isthmus on the lumbar can improve the accuracy of the lumbar sagittal screw angle.
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Affiliation(s)
- Shuiquan Wang
- Department of Anatomy, College of Basic Medicine, Xinjiang Medical University, Urumqi, China
| | - Dilimulati Aikeremu
- Department of 2nd Spine Surgery, People's Hospital of Xinjiang, Urumqi, China
| | - Alafate Kahaer
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Abulikemu Maimaiti
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Yang Xiao
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Abudusalamu Tuoheti
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Rui Zhang
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Xieraili Maimaiti
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Hailong Guo
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
| | - Paerhati Rexiti
- Departments of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
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Liu Y, Zhou X, Li Y, Wang P. The feasibility of a new self-guided pedicle tap for pedicle screw placement: an anatomical study. BMC Musculoskelet Disord 2023; 24:557. [PMID: 37422653 DOI: 10.1186/s12891-023-06681-7] [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: 04/28/2022] [Accepted: 06/30/2023] [Indexed: 07/10/2023] Open
Abstract
PURPOSE To investigate the safety and accuracy of applying a new self-guided pedicle tap to assist pedicle screw placement. METHODS A new self-guided pedicle tap was developed based on the anatomical and biomechanical characteristics of the pedicle. Eight adult spine specimens, four males and four females, were selected and tapped on the left and right sides of each pair of T1-L5 segments using conventional taps (control group) and new self-guided pedicle taps (experimental group), respectively, and pedicle screws were inserted. The screw placement time of the two groups were recorded and compared using a stopwatch. The safety and accuracy of screw placement were observed by CT scanning of the spine specimens and their imaging results were graded according to the Heary grading criteria. RESULTS Screw placement time of the experimental group were (5. 73 ± 1. 18) min in thoracic vertebrae and (5. 09 ± 1. 31) min in lumbar vertebrae respectively. Screw placement time of the control group were respectively (6. 02 ± 1. 54) min in thoracic vertebrae and (5.51 ± 1.42) min in lumbar vertebrae. The difference between the two groups was not statistically significant (P > 0. 05). The Heary grading of pedicle screws showed 112 (82.35%) Heary grade I screws and 126 (92.65%) Heary grade I + II screws in the experimental group, while 96 (70.59%) Heary grade I screws and 112 (82.35%) Heary grade I + II screws in the control group.The difference between the two groups was statistically significant (P < 0.05). CONCLUSION The new self-guided pedicle tap can safely and accurately place thoracic and lumbar pedicle screws with low-cost and convenient procedure,which indicates a good clinical application value.
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Affiliation(s)
- Yongtao Liu
- Department of Spine Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou Jiangsu, 221000, China
| | - Xiaoji Zhou
- Department of Orthopedics, The People's Hospital of Huishan, Wuxi Jiangsu, 214000, China
| | - Yuan Li
- Medical Imaging Department, Affiliated Hospital of Xuzhou Medical University, Xuzhou Jiangsu, 221000, China
| | - Peng Wang
- Department of Clinical Laboratory, Xuzhou Central Hospital, Xuzhou Jiangsu, 221000, China.
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Mullins RA, Espinel Ruperéz J, Bleedorn J, Hoey S, Hetzel S, Ortega C, Kraus KH, Guevar J. Accuracy of pin placement in the canine thoracolumbar spine using a free-hand probing technique versus 3D-printed patient-specific drill guides: An ex-vivo study. Vet Surg 2023; 52:648-660. [PMID: 37071824 DOI: 10.1111/vsu.13958] [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: 10/20/2022] [Revised: 02/17/2023] [Accepted: 03/20/2023] [Indexed: 04/20/2023]
Abstract
OBJECTIVE To compare pin placement accuracy, intraoperative technique deviations, and duration of pin placement for pins placed by free-hand probing (FHP) or 3D-printed drill guide (3DPG) technique. SAMPLE POPULATION Four greyhound cadavers. METHODS Computed tomography (CT) examinations from T6-sacrum were obtained for determination of optimal pin placement and 3DPG creation. Two 3.2/2.4-mm positive profile pins were inserted per vertebra, one left and one right from T7-L7 (FHP [n = 56]; 3DPG [n = 56]) by one surgeon and removed for repeat CT. Duration of pin placement and intraoperative deviations (unanticipated deviations from planned technique) were recorded. Pin tracts were graded by two blinded observers using modified Zdichavsky classification. Descriptive statistics were used. RESULTS A total of 54/56 pins placed with 3DPGs were assigned grade I (optimal placement) compared with 49/56 pins using the FHP technique. A total of 2/56 pins placed with 3DPGs and 3/56 pins using the FHP technique were assigned grade IIa (partial medial violation). A total of 4/56 pins placed using the FHP technique were assigned grade IIIa (partial lateral violation). No pins were assigned grade IIb (full medial violation). Intraoperative technique deviations occurred with 6/56 pins placed using the FHP technique and no pins with 3DPGs. Overall, pins were placed faster (mean ± SD 2.6 [1.3] vs. 4.5 [1.8] min) with 3DPGs. CONCLUSIONS Both techniques were accurate for placement of spinal fixation pins. The 3DPG technique may decrease intraoperative deviations and duration of pin placement. CLINICAL RELEVANCE Both techniques allow accurate pin placement in the canine thoracolumbar spine. The FHP technique requires specific training and has learning curve, whereas 3DPG technique requires specific software and 3D printers.
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Affiliation(s)
- Ronan A Mullins
- Section of Small Animal Clinical Studies, University College Dublin, Dublin, Ireland
| | - Jorge Espinel Ruperéz
- Section of Small Animal Clinical Studies, University College Dublin, Dublin, Ireland
| | - Jason Bleedorn
- Department of Veterinary Clinical Sciences, Colorado State University, Fort Collins, Colorado, USA
| | - Seamus Hoey
- Equine Clinical Studies, Diagnostic Imaging and Anaesthesia, School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Scott Hetzel
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison School of Medicine & Public Health, Madison, Wisconsin, USA
| | - Cristina Ortega
- Section of Small Animal Clinical Studies, University College Dublin, Dublin, Ireland
| | - Karl H Kraus
- Department of Clinical Sciences, College of Veterinary Medicine, Iowa State University, Iowa, USA
| | - Julien Guevar
- Division of Surgery, Department of Clinical Sciences, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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9
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LeRoy TE, Smith IC, Kim DH, Golenbock SW, Baker KC, Arnold PM, Sasso RC, Park DK, Fischgrund JS, Zaidi QH, Hwang RW. Clinical Significance of Lateral Pedicle Screw Malposition in Lumbar Spine Fusion. Clin Spine Surg 2023; 36:E258-E262. [PMID: 36823702 DOI: 10.1097/bsd.0000000000001440] [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: 02/13/2022] [Accepted: 12/13/2022] [Indexed: 02/25/2023]
Abstract
STUDY DESIGN Retrospective cohort study. OBJECTIVE Our objective was to determine whether lateral pedicle screw breach affects fusion rates and patient-reported outcomes in lumbar fusion surgery. SUMMARY OF BACKGROUND DATA Although lateral pedicle screw malposition is considered relatively benign, few studies have focused specifically on clinical outcomes or fusion rates associated with lateral screw malposition. METHODS Twelve-month postoperative computed tomography scans were reviewed for lateral breach, severity of breach, and fusion status. Patients with lateral breach were compared with patients with no breach. Outcome measures included Numerical Pain Rating Scale for back and leg pain, Oswestry Disability Index, and SF-36 physical function (SF-36 PF). Multivariable linear and logistic regression and were adjusted for age, procedure, level, and/or baseline pain score. RESULTS Forty-five patients (31%) demonstrated 1 or more lateral breaches as compared with 99 patients without breach. After adjusting for baseline scores and fusion level, patients with 2 or more screw breaches experienced SF-36 PF score improvements that were 3.43 points less ( P =0.016) than patients with no lateral breach. After adjusting for baseline Numerical Pain Rating Scale, there was also a significant decrease in the odds of achieving minimally clinical important difference in back pain relief in these patients. There was no observed effect of lateral breach on the odds of successful fusion. CONCLUSIONS The current study did not observe an association between laterally malpositioned pedicle screws and nonunion. However, results are consistent with a negative effect on SF-36 PF scores and self-reported back pain at 12 months.
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Affiliation(s)
- Taryn E LeRoy
- Department of Orthopaedic Surgery, Tufts Medical Center
| | - Isabel C Smith
- Department of Orthopaedic Surgery, New England Baptist Hospital
- Department of Research, New England Baptist Hospital
| | - David H Kim
- Department of Orthopaedic Surgery, New England Baptist Hospital
- Tufts University School of Medicine, Boston, MA
| | | | - Kevin C Baker
- Department of Orthopaedic Surgery, William Beaumont Hospital, Royal Oak, MI
| | | | | | - Daniel K Park
- Department of Orthopaedic Surgery, William Beaumont Hospital, Royal Oak, MI
| | | | - Qasim H Zaidi
- Department of Orthopaedic Surgery, New England Baptist Hospital
| | - Raymond W Hwang
- Department of Orthopaedic Surgery, New England Baptist Hospital
- Tufts University School of Medicine, Boston, MA
- Boston Orthopaedic and Spine, Chestnut Hill, MA
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Degulmadi D, Dave BR, Chauhan V, Krishnan A, Mayi SC, Rai R, Dave MB, Bali S, Charde P, Anil A. Comparative Study on Accuracy of Intra-Operative Computed Tomography-Navigation Based Pedicle Screw Placement With Skin vs Bone Fixed Dynamic Reference Frame in Minimally Invasive Transforaminal Lumbar Interbody Fusion. Global Spine J 2023:21925682231181884. [PMID: 37279918 DOI: 10.1177/21925682231181884] [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] [Indexed: 06/08/2023] Open
Abstract
STUDY DESIGN Retrospective comparative study. OBJECTIVE To compare the accuracy of intra-operative navigation-assisted percutaneous pedicle screw insertion between bone fixed and skin fixed dynamic reference frame (DRF) in Minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF). METHODS Between October 2018 and September 2022, patients who underwent MIS-TLIF were included in this study with DRF fixed either on bone (group B) or skin (group S). Pedicle screws were inserted under the guidance of intra-operative Cone bean Computed tomography (cbCT) based navigation. Accuracy of pedicle screw placement was immediately checked by a final intra-operative cbCT Spin. RESULTS Among 170 patients, group B included 91 patients and group S included 79 patients. Out of total 680 screws, 364 screws (group B) and 316 screws (group S) were placed. Patient's demographic data and distribution of screws showed no statistically significant difference. The accuracy showed no significant difference between both the groups (94.5% in group B and 94.3% in group S). CONCLUSION Skin fixed DRF can serve as an alternate way for placement and avoids extra incision with similar accuracy in pedicle screw insertions with bone fixed DRF using intra-operative CT guided navigation in MIS TLIF.
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Affiliation(s)
- Devanand Degulmadi
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Bharat R Dave
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Vikrant Chauhan
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Ajay Krishnan
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Shivanand C Mayi
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Ravi Rai
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Mirant Bharat Dave
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Shivkumar Bali
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Pranav Charde
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
| | - Abhijith Anil
- Department of Spine Surgery, Stavya Spine Hospital and Research Institute, Nr Nagari Hospital, Ahmedabad, India
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Du SY, Dai J, Zhou ZT, Shan BC, Jiang FX, Yang JY, Cao L, Zhou XZ. Size selection and placement of pedicle screws using robot-assisted versus fluoroscopy-guided techniques for thoracolumbar fractures: possible implications for the screw loosening rate. BMC Surg 2022; 22:365. [PMID: 36273170 PMCID: PMC9587613 DOI: 10.1186/s12893-022-01814-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/10/2022] [Indexed: 11/13/2022] Open
Abstract
Background There has been increased development of robotic technologies for the accuracy of percutaneous pedicle screw placement. However, it remains unclear whether the robot really optimize the selection of screw sizes and enhance screw stability. The purpose of this study is to compare the sizes (diameter and length), placement accuracy and the loosening rate of pedicle screws using robotic-assisted versus conventional fluoroscopy approaches for thoracolumbar fractures. Methods A retrospective cohort study was conducted to evaluate 70 consecutive patients [34 cases of robot-assisted percutaneous pedicle screw fixation (RAF) and 36 of conventional fluoroscopy-guided percutaneous pedicle screw fixation (FGF)]. Demographics, clinical characteristics, and radiological features were recorded. Pedicle screw length, diameter, and pedicle screw placement accuracy were assessed. The patients’ sagittal kyphosis Cobb angles (KCA), anterior vertebral height ratios (VHA), and screw loosening rate were evaluated by radiographic data 1 year after surgery. Results There was no significant difference in the mean computed tomography (CT) Hounsfield unit (HU) values, operation duration, or length of hospital stay between the groups. Compared with the FGF group, the RAF group had a lower fluoroscopy frequency [14 (12–18) vs. 21 (16–25), P < 0.001] and a higher “grade A + B” pedicle screw placement rate (96.5% vs. 89.4%, P < 0.05). The mean screw diameter was 6.04 ± 0.55 mm in the RAF group and 5.78 ± 0.50 mm in the FGF group (P < 0.001). The mean screw length was 50.45 ± 4.37 mm in the RAF group and 48.63 ± 3.86 mm in the FGF group (P < 0.001). The correction loss of the KCA and VHR of the RAF group was less than that of the FGT group at the 1-year follow-up [(3.8 ± 1.8° vs. 4.9 ± 4.2°) and (5.5 ± 4.9% vs. 6.4 ± 5.7%)], and screw loosening occurred in 2 out of 34 patients (5.9%) in the RAF group, and 6 out of 36 patients (16.7%) in the FGF group, but there were no significant differences (P > 0.05). Conclusion Compared with the fluoroscopy-guided technique, robotic-assisted spine surgery decreased radiation exposure and optimizes screw trajectories and dimensions intraoperatively. Although not statistically significant, the loosening rate of the RAF group was lower that of than the FGT group.
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Affiliation(s)
- Sheng-Yang Du
- Department of Orthopaedics, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, China.,Department of Orthopaedics, First People's Hospital of Xuzhou, 269 Daxue Road, Xuzhou, Jiangsu, China
| | - Jun Dai
- Department of Orthopaedics, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, China
| | - Zhen-Tao Zhou
- Department of Orthopaedics, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, China
| | - Bing-Chen Shan
- Department of Orthopaedics, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, China
| | - Feng-Xian Jiang
- Department of Orthopaedics, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, China
| | - Jing-Yan Yang
- Institute for Social and Economic Research and Policy, Graduate School of Arts and Sciences, Columbia University, New York, NY, USA.
| | - Lei Cao
- Department of Orthopaedics, First People's Hospital of Xuzhou, 269 Daxue Road, Xuzhou, Jiangsu, China.
| | - Xiao-Zhong Zhou
- Department of Orthopaedics, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu, China.
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Peterson SL, Mounsef JB, Sebastian AS, Morrissey PB. Intraoperative Triggered Electromyography: Indispensable in Routine Lumbar Fusions? Clin Spine Surg 2022; 35:329-332. [PMID: 33872222 DOI: 10.1097/bsd.0000000000001158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Shian Liu Peterson
- Department of Orthopedic Surgery, Naval Medical Center San Diego, San Diego, CA
| | - Jad Bou Mounsef
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN
| | | | - Patrick B Morrissey
- Department of Orthopedic Surgery, Naval Medical Center San Diego, San Diego, CA
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13
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Goldberg JL, Härtl R, Elowitz E. Challenges Hindering Widespread Adoption of Minimally Invasive Spinal Surgery. World Neurosurg 2022; 163:228-232. [PMID: 35729824 DOI: 10.1016/j.wneu.2022.03.129] [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: 03/25/2022] [Accepted: 03/28/2022] [Indexed: 10/18/2022]
Abstract
Minimally invasive spinal surgery (MISS) techniques offer several beneficial prospects and are being increasingly requested by patients. However, these techniques have not been uniformly adopted by spinal surgeons, and they remain controversial among some. Several barriers have prevented widespread adoption of MISS. These include concerns regarding high start-up costs, limited evidence base, and lack of surgeon training. In addition, the unique approaches involved in MISS expose spinal surgeons to unfamiliar anatomy. Further, while MISS can address a growing spectrum of spinal pathology, some conditions, as well as complications encountered during MISS procedures, require open surgery. This requires surgeons to not only acquire the new and specialized MISS skillset but also maintain their ability to perform open surgery. These factors present challenges common to developing and innovative surgical techniques. Here, we review the barriers preventing wider adoption of MISS and present a framework to promote the safe and effective growth of MISS.
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Affiliation(s)
- Jacob L Goldberg
- Department of Neurological Surgery, NewYork-Presbyterian Hospital/Weill Cornell Medicine, New York, New York, USA
| | - Roger Härtl
- Department of Neurological Surgery, NewYork-Presbyterian Hospital/Weill Cornell Medicine, New York, New York, USA
| | - Eric Elowitz
- Department of Neurological Surgery, NewYork-Presbyterian Hospital/Weill Cornell Medicine, New York, New York, USA.
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14
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Yao GL, Xiao ZZ, Xiao T, Zhong NS, Huang SH, Liu JM, Liu ZL. Development and biomechanical test of a new pedicle screw for thoracolumbar spinal surgery. Med Eng Phys 2022; 104:103808. [DOI: 10.1016/j.medengphy.2022.103808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 04/21/2022] [Accepted: 04/21/2022] [Indexed: 11/26/2022]
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15
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Shafi KA, Pompeu YA, Vaishnav AS, Mai E, Sivaganesan A, Shahi P, Qureshi SA. Does robot-assisted navigation influence pedicle screw selection and accuracy in minimally invasive spine surgery? Neurosurg Focus 2022; 52:E4. [DOI: 10.3171/2021.10.focus21526] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 10/14/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE
The accuracy of percutaneous pedicle screw placement has increased with the advent of robotic and surgical navigation technologies. However, the effect of robotic intraoperative screw size and trajectory templating remains unclear. The purpose of this study was to compare pedicle screw sizes and accuracy of placement using robotic navigation (RN) versus skin-based intraoperative navigation (ION) alone in minimally invasive lumbar fusion procedures.
METHODS
A retrospective cohort study was conducted using a single-institution registry of spine procedures performed over a 4-year period. Patients who underwent 1- or 2-level primary or revision minimally invasive surgery (MIS)–transforaminal lumbar interbody fusion (TLIF) with pedicle screw placement, via either robotic assistance or surgical navigation alone, were included. Demographic, surgical, and radiographic data were collected. Pedicle screw type, quantity, length, diameter, and the presence of endplate breach or facet joint violation were assessed. Statistical analysis using the Student t-test and chi-square test was performed to evaluate the differences in pedicle screw sizes and the accuracy of placement between both groups.
RESULTS
Overall, 222 patients were included, of whom 92 underwent RN and 130 underwent ION MIS-TLIF. A total of 403 and 534 pedicle screws were placed with RN and ION, respectively. The mean screw diameters were 7.25 ± 0.81 mm and 6.72 ± 0.49 mm (p < 0.001) for the RN and ION groups, respectively. The mean screw length was 48.4 ± 4.48 mm in the RN group and 45.6 ± 3.46 mm in the ION group (p < 0.001). The rates of “ideal” pedicle screws in the RN and ION groups were comparable at 88.5% and 88.4% (p = 0.969), respectively. The overall screw placement was also similar. The RN cohort had 63.7% screws rated as good and 31.4% as acceptable, while 66.1% of ION-placed screws had good placement and 28.7% had acceptable placement (p = 0.661 and p = 0.595, respectively). There was a significant reduction in high-grade breaches in the RN group (0%, n = 0) compared with the ION group (1.2%, n = 17, p = 0.05).
CONCLUSIONS
The results of this study suggest that robotic assistance allows for placement of screws with greater screw diameter and length compared with surgical navigation alone, although with similarly high accuracy. These findings have implied that robotic platforms may allow for safe placement of the “optimal screw,” maximizing construct stability and, thus, the ability to obtain a successful fusion.
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Affiliation(s)
| | | | | | - Eric Mai
- Hospital for Special Surgery, New York, New York
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16
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Siemionow KB, Forsthoefel CW, Foy MP, Gawel D, Luciano CJ. Autonomous lumbar spine pedicle screw planning using machine learning: A validation study. JOURNAL OF CRANIOVERTEBRAL JUNCTION AND SPINE 2021; 12:223-227. [PMID: 34728987 PMCID: PMC8501821 DOI: 10.4103/jcvjs.jcvjs_94_21] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 07/28/2021] [Indexed: 11/06/2022] Open
Abstract
Introduction: Several techniques for pedicle screw placement have been described including freehand techniques, fluoroscopy assisted, computed tomography (CT) guidance, and robotics. Image-guided surgery offers the potential to combine the benefits of CT guidance without the added radiation. This study investigated the ability of a neural network to place lumbar pedicle screws with the correct length, diameter, and angulation autonomously within radiographs without the need for human involvement. Materials and Methods: The neural network was trained using a machine learning process. The method combines the previously reported autonomous spine segmentation solution with a landmark localization solution. The pedicle screw placement was evaluated using the Zdichavsky, Ravi, and Gertzbein grading systems. Results: In total, the program placed 208 pedicle screws between the L1 and S1 spinal levels. Of the 208 placed pedicle screws, 208 (100%) had a Zdichavsky Score 1A, 206 (99.0%) of all screws were Ravi Grade 1, and Gertzbein Grade A indicating no breech. The final two screws (1.0%) had a Ravi score of 2 (<2 mm breech) and a Gertzbein grade of B (<2 mm breech). Conclusion: The results of this experiment can be combined with an image-guided platform to provide an efficient and highly effective method of placing pedicle screws during spinal stabilization surgery.
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Affiliation(s)
| | | | - Michael P Foy
- Department of Orthopaedics, University of Illinois, Chicago, IL, USA
| | - Dominik Gawel
- Department of Research, Holo Surgical Inc, Chicago, IL, USA
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Rosinski AA, Mittal A, Odeh K, Ungurean V, Leasure J, Telles C, Kondrashov D. Alternatives to Traditional Pedicle Screws for Posterior Fixation of the Degenerative Lumbar Spine. JBJS Rev 2021; 9:01874474-202107000-00016. [PMID: 34319968 DOI: 10.2106/jbjs.rvw.20.00177] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
BACKGROUND Traditional pedicle screws are currently the gold standard to achieve stable 3-column fixation of the degenerative lumbar spine. However, there are cases in which pedicle screw fixation may not be ideal. Due to their starting point lateral to the pars interarticularis, pedicle screws require a relatively wide dissection along with a medialized trajectory directed toward the centrally located neural elements and prevertebral vasculature. In addition, low bone mineral density remains a major risk factor for pedicle screw loosening, pullout, and pseudarthrosis. The purpose of this article is to review the indications, advantages, disadvantages, and complications associated with posterior fixation techniques of the degenerative lumbar spine beyond the traditional pedicle screws. METHODS Comprehensive literature searches of the PubMed, Scopus, and Web of Science databases were performed for 5 methods of posterior spinal fixation, including (1) cortical bone trajectory (CBT) screws, (2) transfacet screws, (3) translaminar screws, (4) spinous process plates, and (5) fusion mass screws and hooks. Articles that had been published between January 1, 1990, and January 1, 2020, were considered. Non-English-language articles and studies involving fixation of the cervical or thoracic spine were excluded from our review. RESULTS After reviewing over 1,700 articles pertaining to CBT and non-pedicular fixation techniques, a total of 284 articles met our inclusion criteria. CBT and transfacet screws require less-extensive exposure and paraspinal muscle dissection compared with traditional pedicle screws and may therefore reduce blood loss, postoperative pain, and length of hospital stay. In addition, several methods of non-pedicular fixation such as translaminar and fusion mass screws have trajectories that are directed away from or posterior to the spinal canal, potentially decreasing the risk of neurologic injury. CBT, transfacet, and fusion mass screws can also be used as salvage techniques when traditional pedicle screw constructs fail. CONCLUSIONS CBT and non-pedicular fixation may be preferred in certain lumbar degenerative cases, particularly among patients with osteoporosis. Limitations of non-pedicular techniques include their reliance on intact posterior elements and the lack of 3-column fixation of the spine. As a result, transfacet and translaminar screws are infrequently used as the primary method of fixation. CBT, transfacet, and translaminar screws are effective in augmenting interbody fixation and have been shown to significantly improve fusion rates and clinical outcomes compared with stand-alone anterior lumbar interbody fusion. LEVEL OF EVIDENCE Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Alexander A Rosinski
- San Francisco Orthopaedic Residency Program, St. Mary's Medical Center, San Francisco, California
| | - Ashish Mittal
- San Francisco Orthopaedic Residency Program, St. Mary's Medical Center, San Francisco, California
| | - Khalid Odeh
- San Francisco Orthopaedic Residency Program, St. Mary's Medical Center, San Francisco, California
| | | | | | | | - Dimitriy Kondrashov
- San Francisco Orthopaedic Residency Program, St. Mary's Medical Center, San Francisco, California
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18
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Khanna O, Beasley R, Franco D, DiMaio S. The Path to Surgical Robotics in Neurosurgery. Oper Neurosurg (Hagerstown) 2021; 20:514-520. [PMID: 33982116 DOI: 10.1093/ons/opab065] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 01/25/2021] [Indexed: 11/15/2022] Open
Abstract
Robotic systems may help efficiently execute complicated tasks that require a high degree of accuracy, and this, in large part, explains why robotics have garnered widespread use in a variety of neurosurgical applications, including intracranial biopsies, spinal instrumentation, and placement of intracranial leads. The use of robotics in neurosurgery confers many benefits, and inherent limitations, to both surgeons and their patients. In this narrative review, we provide a historical overview of robotics and its implementation across various surgical specialties, and discuss the various robotic systems that have been developed specifically for neurosurgical applications. We also discuss the relative advantages of robotic systems compared to traditional surgical techniques, particularly as it pertains to integration of image guidance with the ability of the robotic arm to reliably execute pre-planned tasks. As more neurosurgeons adopt the use of robotics in their practice, we postulate that further technological advancements will become available that will help achieve improved technical capabilities, user experience, and overall patient clinical outcomes.
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Affiliation(s)
- Omaditya Khanna
- Department of Neurological Surgery, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA
| | - Ryan Beasley
- SimQuest Solutions, Inc., Annapolis, Maryland, USA
| | - Daniel Franco
- Department of Neurological Surgery, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA
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19
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Jain M, Sahu RN, Gaikwad MR, Panda S, Tirpude A, Bag ND. Validation of Freehand Cervical Pedicle Screw Placement in Subaxial Spine Using the "Burcev Technique": A Cadaveric Study. J Neurosci Rural Pract 2021; 12:555-559. [PMID: 34295111 PMCID: PMC8289562 DOI: 10.1055/s-0041-1727410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The present study attempted to validate the “Burcev freehand method” based on anatomical observations in Indian cadavers. The study was conducted on 32 cervical pedicle screws (CPSs) that were placed in four cadavers by the authors according to the “freehand technique,” described by Burcev et al, without the aid of fluoroscopy and the trajectory verified by computed tomography scans. The screws were designated as satisfactory, permissible, or unacceptable. Descriptive variables were represented in number and percentages, continuous variables were represented as mean ± standard deviation (SD). Of the 32 CPSs placed, 24 (75%) exhibited a satisfactory position, 1 (3%) exhibited a permissible position, and 7 (22%) exhibited an unacceptable position. Of the seven CPSs in the unacceptable group, four exhibited a lateral breach and three exhibited a medial breach, whereas the CPS in the permissible group exhibited a medial breach. The overall angle with contralateral lamina in the horizontal plane in terms of mean ± SD was 175.43 ± 2.82, 169.49, and 169.65 ± 6.46 degrees in the satisfactory, permissible, and unacceptable groups, respectively. In the sagittal plane, the screws exhibited an angle of 88.15 ± 3.56 degrees. No breach was observed superiorly or inferiorly. The “Burcev technique” is replicable with similar results in cadavers. Further studies must be conducted in a clinical setting to ensure its safety.
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Affiliation(s)
- Mantu Jain
- Department of Orthopedics, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Rabi N Sahu
- Department of Neurosurgery, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Manisha R Gaikwad
- Department of Anatomy, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Sashikanta Panda
- Department of Orthopedics, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Amit Tirpude
- Department of Anatomy, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Nerbadyswari D Bag
- Department of Radiodiagnosis, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
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Librianto D, Saleh I, Fachrisal, Utami WS, Hutami WD. Breach Rate Analysis of Pedicle Screw Instrumentation using Free-Hand Technique in the Surgical Correction of Adolescent Idiopathic Scoliosis. J Orthop Case Rep 2021; 11:38-44. [PMID: 34141640 PMCID: PMC8046465 DOI: 10.13107/jocr.2021.v11.i01.1956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Introduction Free-hand technique is one of the techniques used by spine surgeon during pedicle screw instrumentation of surgical correction of spinal deformities, including scoliosis. The previous studies showed that this technique is safe. However, some inherent factors may influence its outcomes, including screw breaching which is potentially violates spinal cord and other intimate structures. To confirm the safety and accuracy of this technique, additional study measuring the breach rate of pedicle screw placement in scoliosis is mandatory. Materials and Methods We performed a retrospective study of patients with adolescent idiopathic scoliosis (AIS) from Fatmawati General Hospital, Jakarta, treated for surgical correction during a period of 2017-2018 using free-hand technique for pedicle screw instrumentation. Post-operative computed tomography scan (CT scan) was analyzed to measure the medial and lateral breaches. P < 0.05 was deemed to be statistically significant. Results A total of 94 pedicle screws from six female patients with AIS were included in our study. Overall breach occurred in 33% instrumented screws, the majority of it was a low-grade breach. Of the breached screws, medial and lateral breach occurred in 20% and 12% of screws, respectively. There were no differences in the overall, medial, and lateral breaches between thoracic and lumbar vertebrae (P > 0.05). Medial breach was significantly higher in middle thoracic segment compared to other thoracic segments (P = 0.048). Risk of medial breach was 3 times higher in the convex side of deformity (P = 0.012), whereas risk of lateral breach was 4.6 times higher in the concave side of the deformity (P = 0.021). Conclusion The majority of breached screws were low-grade violation within the safe zone, with no neurological sequelae. Our study found that free-hand technique is safe and effective method of pedicle screw instrumentation for correction of AIS. Some inherent factors may influence the risk of pedicle screw breach.
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Affiliation(s)
- Didik Librianto
- Department of Orthopaedic and Traumatology, Fatmawati Hospital Jl. RS. Fatmawati Raya No.4, Cilandak, Kota Jakarta Selatan, Jakarta, Indonesia
| | - Ifran Saleh
- Department of Orthopaedic and Traumatology, Faculty of Medicine Universitas Indonesia, Cipto Mangunkusumo Hospital, Jl. Pangeran Diponegoro No. 71, Senen, Kota Jakarta Pusat, Jakarta, Indonesia
| | - Fachrisal
- Department of Orthopaedic and Traumatology, Fatmawati Hospital Jl. RS. Fatmawati Raya No.4, Cilandak, Kota Jakarta Selatan, Jakarta, Indonesia
| | - Widyastuti Srie Utami
- Department of Orthopaedic and Traumatology, Tarakan Hospital, Jl. Kyai Caringin No. 7, Cideng, Kota Jakarta Pusat, Jakarta, Indonesia
| | - Witantra Dhamar Hutami
- Department of Orthopaedic and Traumatology, Faculty of Medicine Universitas Indonesia, Cipto Mangunkusumo Hospital, Jl. Pangeran Diponegoro No. 71, Senen, Kota Jakarta Pusat, Jakarta, Indonesia
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Ibrahim F, Elkhateeb TM, Abd El-Rady A, Zayan M. Transforaminal Posterior Approach Is Effective for Treatment of Lower Thoracic Spine Spondylodiscitis. HSS J 2020; 16:515-520. [PMID: 33380990 PMCID: PMC7749920 DOI: 10.1007/s11420-019-09688-w] [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: 12/04/2018] [Accepted: 04/18/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Patients with lower-thoracic spine pathologies that affect anterior column stability and compress the neural tissues need anterior decompression and reconstruction. Anterior approaches result in long-term morbidities. Posterior laminectomy and fixation alone may not be sufficient to maintain spine stability. QUESTIONS/PURPOSES To evaluate the results of a posterior-only transforaminal thoracic interbody fusion approach for patients with thoracic disc space infection in terms of the improvement in neurologic status, resolution of infection, correction of kyphotic deformity, and assessment of post-operative complications. METHODS A prospective study was done on 40 patients with lower thoracic spine spondylodiscitis. All patients were assessed with pre-operative imaging. Neurologic assessment was performed using the American Spinal Injury Association (ASIA) Impairment Scale and functionally by the modified Japanese Orthopedic Association (JOA) scale. Pre-operative and post-operative white blood cell count, erythrocyte sedimentation rate, and C-reactive protein levels were compared. All patients were operated on through a posterior approach using the transforaminal thoracic interbody fusion for decompression, reconstruction, and anterior fusion. RESULTS Mean age of patients was 49 years; mean operative period was 188 min; mean blood loss was 611 mL. Twelve patients' ASIA scores improved and only two patients' scores declined. One patient died 11 months post-operatively due to septicemia. The mean follow-up period was 27.8 months. The modified JOA score improved from 6.3 ± 1.6 to 9.5 ± 0.6. The local kyphosis angle was improved from 13.8 to 6.9° post-operatively, with insignificant loss of correction at the end of follow-up. Thirty-eight out of 40 patients had solid anterior fusion at the end of follow-up. CONCLUSION The clinical outcomes of this study showed that the transforaminal thoracic interbody approach is effective for both decompression and anterior reconstruction of the lower thoracic spine in patients with spondylodiscitis.
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Affiliation(s)
- Fady Ibrahim
- Department of Orthopedic, Spine Surgery, Faculty of Medicine, Ain Shams University, Abbasseya, Cairo Egypt
| | - Tameem Mohamed Elkhateeb
- Department of Orthopedic, Spine Surgery, Faculty of Medicine, Ain Shams University, Abbasseya, Cairo Egypt
| | - Abdelrady Abd El-Rady
- Department of Orthopedic, Spine Surgery, Faculty of Medicine, Ain Shams University, Abbasseya, Cairo Egypt
| | - Mohammed Zayan
- Department of Orthopedic, Spine Surgery, Faculty of Medicine, Ain Shams University, Abbasseya, Cairo Egypt
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De la Garza Ramos R, Echt M, Benton JA, Gelfand Y, Longo M, Yanamadala V, Yassari R. Accuracy of Freehand versus Navigated Thoracolumbar Pedicle Screw Placement in Patients with Metastatic Tumors of the Spine. J Korean Neurosurg Soc 2020; 63:777-783. [PMID: 33181866 PMCID: PMC7671770 DOI: 10.3340/jkns.2020.0001] [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: 12/31/2019] [Accepted: 03/25/2020] [Indexed: 11/27/2022] Open
Abstract
Objective To compare the accuracy and breach rates of freehand (FH) versus navigated (NV) pedicle screws in the thoracic and lumbar spine in patients with metastatic spinal tumors.
Methods A retrospective review of adult patients who underwent pedicle screw fixation in the thoracic or lumbar spine for metastatic spinal tumors between 2012 and 2018 was conducted. Breaches were assessed based on the Gertzbein and Robbins classification and only screws placed >4 mm outside of the pedicle wall (lateral or medial) were considered breached.
Results A total of 62 patients received 547 pedicle screws (average 8 per patient) – 34 patients received 298 pedicle screws in the FH group and 28 patients received 249 screws in the NV group. There were 40/547 breaches, corresponding to a breach and accuracy rate of 7.3% and 92.7%, respectively. The breach rate was 9.7% in the FH group and 4.4% in the NV group (chi-squared test, p=0.017); this corresponded to an accuracy rate of 90.3% and 95.6%, respectively. Only one patient from the overall cohort (in the FH group) required revision surgery due to a medial breach abutting the spinal cord (1.6% of all patients; 2.9% of FH patients); no patient suffered organ, vessel, or neurological injury from screw breaches.
Conclusion Navigated pedicle screw placement in patients with metastatic spinal tumors has a significantly higher radiographic accuracy compared to the FH technique. However, the revision surgery was low and no patient suffered from clinically-relevant breach. Navigation also offers the advantage of real-time localization of spinal tumors and aids in targeting and resection of these lesions.
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Affiliation(s)
- Rafael De la Garza Ramos
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neurological Surgery, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Murray Echt
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neurological Surgery, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Joshua A Benton
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Yaroslav Gelfand
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neurological Surgery, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Michael Longo
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Vijay Yanamadala
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neurological Surgery, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
| | - Reza Yassari
- Spine Research Group, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neurological Surgery, Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, NY, USA
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Tokala DP, Ahuja S. Is it mandatory to routinely use image intensifier during scoliosis surgery? – Results of an email survey. NORTH AMERICAN SPINE SOCIETY JOURNAL (NASSJ) 2020; 3:100024. [PMID: 35141592 PMCID: PMC8820072 DOI: 10.1016/j.xnsj.2020.100024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 09/01/2020] [Accepted: 09/03/2020] [Indexed: 11/02/2022]
Abstract
Background Methods Results Conclusions
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24
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Sundaram PPM, Oh JYL, Tan M, Nolan CP, Yu CS, Ling JM. Accuracy of Thoracolumbar Pedicle Screw Insertion Based on Routine Use of Intraoperative Imaging and Navigation. Asian Spine J 2020; 15:491-497. [PMID: 32951407 PMCID: PMC8377205 DOI: 10.31616/asj.2020.0068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 04/26/2020] [Indexed: 11/30/2022] Open
Abstract
Study Design Retrospective review. Purpose To determine the accuracy of thoracolumbar pedicle screw insertion with the routine use of three-dimensional (3D) intraoperative imaging and navigation over a large series of screws in an Asian population. Overview of Literature The use of 3D intraoperative imaging and navigation in spinal surgery is aimed at improving the accuracy of pedicle screw insertion. This study analyzed 2,240 pedicle screws inserted with the routine use of intraoperative navigation. It is one of very few studies done on an Asian population with a large series of screws. Methods Patients who had undergone thoracolumbar pedicle screws insertion using intraoperative imaging and navigation between 2009 and 2017 were retrospectively analyzed. Computed tomography (CT) images acquired after the insertion of pedicle screws were analyzed for breach of the pedicle wall. The pedicle screw breaches were graded according to the Gertzbein classification. The breach rate and revision rate were subsequently calculated. Results A total of 2,240 thoracolumbar pedicle screws inserted under the guidance of intraoperative navigation were analyzed, and the accuracy of the insertion was 97.41%. The overall breach rate was 2.59%, the major breach rate was 0.94%, and the intraoperative screw revision rate was 0.7%. There was no incidence of return to the operating theater for revision of screws. Conclusions The routine use of 3D navigation and intraoperative CT imaging resulted in consistently accurate pedicle screw placement. This improved the safety of spinal instrumentation and helped in avoiding revision surgery for malpositioned screws.
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Affiliation(s)
| | - Jacob Yoong-Leong Oh
- Spine Division, Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | - Mark Tan
- Spine Division, Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | | | - Chun Sing Yu
- Spine Division, Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | - Ji Min Ling
- Department of Neurosurgery, National Neuroscience Institute, Singapore
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25
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Kochanski RB, Lombardi JM, Laratta JL, Lehman RA, O'Toole JE. Image-Guided Navigation and Robotics in Spine Surgery. Neurosurgery 2020; 84:1179-1189. [PMID: 30615160 DOI: 10.1093/neuros/nyy630] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 12/04/2018] [Indexed: 01/27/2023] Open
Abstract
Image guidance (IG) and robotics systems are becoming more widespread in their utilization and can be invaluable intraoperative adjuncts during spine surgery. Both are highly reliant upon stereotaxy and either pre- or intraoperative radiographic imaging. While user-operated IG systems have been commercially available longer and subsequently are more widely utilized across centers, robotics systems provide unique theoretical advantages over freehand and IG techniques for placing instrumentation within the spine. While there is a growing plethora of data showing that IG and robotic systems decrease the incidence of malpositioned screws, less is known about their impact on clinical outcomes. Both robotics and IG may be of particular value in cases of substantial deformity or complex anatomy. Indications for the use of these systems continue to expand with an increasing body of literature justifying their use in not only guiding thoracolumbar pedicle screw placement, but also in cases of cervical and pelvic instrumentation as well as spinal tumor resection. Both techniques also offer the potential benefit of reducing occupational exposures to ionizing radiation for the operating room staff, the surgeon, and the patient. As the use of IG and robotics in spine surgery continues to expand, these systems' value in improving surgical accuracy and clinical outcomes must be weighed against concerns over cost and workflow. As newer systems incorporating both real-time IG and robotics become more utilized, further research is necessary to better elucidate situations where these systems may be particularly beneficial in spine surgery.
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Affiliation(s)
- Ryan B Kochanski
- Department of Neurosurgery, Rush University Medical Center, Chicago, Illinois
| | - Joseph M Lombardi
- Department of Orthopedic Surgery, Columbia University, New York, New York
| | - Joseph L Laratta
- Department of Orthopedic Surgery, Columbia University, New York, New York
| | - Ronald A Lehman
- Department of Orthopedic Surgery, Columbia University, New York, New York
| | - John E O'Toole
- Department of Neurosurgery, Rush University Medical Center, Chicago, Illinois
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26
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Hussain I, Cosar M, Kirnaz S, Schmidt FA, Wipplinger C, Wong T, Härtl R. Evolving Navigation, Robotics, and Augmented Reality in Minimally Invasive Spine Surgery. Global Spine J 2020; 10:22S-33S. [PMID: 32528803 PMCID: PMC7263339 DOI: 10.1177/2192568220907896] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Innovative technology and techniques have revolutionized minimally invasive spine surgery (MIS) within the past decade. The introduction of navigation and image-guided surgery has greatly affected spinal surgery and will continue to make surgery safer and more efficient. Eventually, it is conceivable that fluoroscopy will be completely replaced with image guidance. These advancements, among others such as robotics and virtual and augmented reality technology, will continue to drive the value of 3-dimensional navigation in MIS. In this review, we cover pertinent features of navigation in MIS and explore their evolution over time. Moreover, we aim to discuss the key features germane to surgical advancement, including technique and technology development, accuracy, overall health care costs, operating room time efficiency, and radiation exposure.
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Affiliation(s)
- Ibrahim Hussain
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
- Ibrahim Hussain and Murat Cosar are equal contributors to this study
| | - Murat Cosar
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
- Ibrahim Hussain and Murat Cosar are equal contributors to this study
| | - Sertac Kirnaz
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
| | - Franziska A. Schmidt
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
| | - Christoph Wipplinger
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
| | - Taylor Wong
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
| | - Roger Härtl
- Weill Cornell Medical College, New York–Presbyterian Hospital, New York, NY, USA
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27
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Sumiya S, Numano F, Ogawa T, Yoshii T, Okawa A, Komori H. Accuracy of pedicle screw insertion for unilateral open transforaminal lumbar interbody fusion: a side-by-side comparison of percutaneous and conventional open techniques in the same patients. BMC Musculoskelet Disord 2020; 21:168. [PMID: 32171291 PMCID: PMC7071703 DOI: 10.1186/s12891-020-3180-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 02/28/2020] [Indexed: 11/16/2022] Open
Abstract
Background The aim of the study was to compare the accuracy of percutaneous pedicle screw (PPS) insertion (P-side) with that of conventional open screw insertion (O-side) during unilateral open transforaminal lumbar interbody fusion (TLIF) in the same patients. We also sought to determine the incidence of pedicle screw misplacement and to identify relevant risk factors. Methods The study was a retrospective analysis of prospectively collected data for 766 pedicle screws placed in 181 consecutive patients who underwent a unilateral open-TLIF procedure in the lumbosacral spine. Our minimally invasive TLIF was performed by unilateral open freehand insertion of pedicle screws for decompression on one side and PPS on the opposite side. Using this approach, we were able to compare the accuracy of PPS insertion with that of conventional open screw insertion in the same patients. There were 383 PPSs and 383 screws inserted by the open method. The accuracy of screw placement was evaluated on reconstructed computed tomography images obtained postoperatively, and screw misplacement was classified. Potential risk factors for screw misplacement were investigated in three-level mixed-effects logistic regression analysis. Results Thirty-four screws (8.9%) were misplaced on the P-side and 37 (9.5%) were misplaced on the O-side; the difference was not statistically significant (P = 0.803). Subclassification analysis revealed minor perforation of 28 screws (7.3%) on the P-side and 32 (8.4%) on the O-side, moderate perforation of 5 screws (1.3%) on the P-side and 4 (1.0%) on the O-side, and severe perforation of 1 screw (0.3%) on each side. Three-level mixed-effects logistic regression analysis identified body mass index as a significant risk factor for screw misplacement on the P-side (odds ratio 1.194, 95% confidence interval 1.066–1.338). Conclusions Accuracy of pedicle screw insertion was not significantly different between PPS insertion and conventional open screw insertion in the same patients. Body mass index had a significant influence on the risk of screw misplacement in PPS insertion.
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Affiliation(s)
- Satoshi Sumiya
- Department of Orthopaedic and Spine Surgery, Yokohama-City Minato Red Cross Hospital, 3-12-1 Shinyamashita, Naka-ku, Yokohama City, Kanagawa, 231-8682, Japan. .,Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan.
| | - Fujiki Numano
- Department of Orthopaedic and Spine Surgery, Yokohama-City Minato Red Cross Hospital, 3-12-1 Shinyamashita, Naka-ku, Yokohama City, Kanagawa, 231-8682, Japan.,Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Takahisa Ogawa
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toshitaka Yoshii
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Atsushi Okawa
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hiromichi Komori
- Department of Orthopaedic and Spine Surgery, Yokohama-City Minato Red Cross Hospital, 3-12-1 Shinyamashita, Naka-ku, Yokohama City, Kanagawa, 231-8682, Japan
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Wu C, Deng J, Li T, Tan L, Yuan D. Percutaneous Pedicle Screw Placement Aided by a New Drill Guide Template Combined with Fluoroscopy: An Accuracy Study. Orthop Surg 2020; 12:471-479. [PMID: 32133781 PMCID: PMC7189065 DOI: 10.1111/os.12642] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/22/2020] [Accepted: 02/04/2020] [Indexed: 12/12/2022] Open
Abstract
Objective To evaluate the accuracy of percutaneous pedicle screw (PPS) placement aided by a new drill guide template. Methods The patients were divided into guide template group and conventional perspective group. In the conventional perspective group, the screws were placed by hand under fluoroscopy. In the guide template group, the screw placement was aided by a new drill guide template, and the drill guide template is designed according to the patient's ideal pedicle screw, but not based on skin morphology. The accuracy was evaluated by comparing the following parameters between the two groups: pedicle breach level, inclination angle deviation between the left and right screws, sagittal angle deviation between the left and right screws, and position deviation of the left and right screw entry points. The consistency of the postoperative screw angle and the corresponding guide template inclination angle was compared in the guide template group. The operative time, blood loss, and radiation times were compared between the groups. Results A total of 146 patients (876 screws) were enrolled in our study including 79 (474 screws) in the guide template group and 67 (402 screws) in the conventional perspective group. The pedicle breach level in the guide template group (22/474) was significantly lower than that in the conventional perspective group (47/402) (P < 0.05). The position and direction deviations of the left and right screws in the guide template group (2.06 ± 1.02 mm, 1.23 ± 1.25 mm, 1.83° ± 1.49°) were significantly less than those in the conventional perspective group (5.33 ± 2.99 mm, 4.32 ± 3.25 mm, 2.87° ± 1.56°). The operation time, blood loss, and radiation times were significantly lower in the guide template group (80.49 ± 9.14 min, 50.42 ± 8.9 mL, 11.02 ± 2.44) than those in the conventional perspective group (108.1 ± 21.18 min, 71.7 ± 17.09 mL, 23.53 ± 4.54). There were no significant differences between the postoperative screw angle and the corresponding guide template angle in the guide template group. Conclusion PPS placement aided by a new drill guide template yielded higher screw accuracy and less operative time, blood loss, and radiation exposure than traditional screw placement.
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Affiliation(s)
- Chao Wu
- Represent Orthopedics Center of Zigong Fourth People's Hospital, Zigong, Sichuan as province, China.,Represent Digital Medical Center of Zigong Fourth People's Hospital, Zigong, Sichuan as province, China
| | - Jiayan Deng
- Represent Digital Medical Center of Zigong Fourth People's Hospital, Zigong, Sichuan as province, China
| | - Tao Li
- Represent Orthopedics Center of Zigong Fourth People's Hospital, Zigong, Sichuan as province, China
| | - Lun Tan
- Represent Orthopedics Center of Zigong Fourth People's Hospital, Zigong, Sichuan as province, China
| | - Dechao Yuan
- Represent Orthopedics Center of Zigong Fourth People's Hospital, Zigong, Sichuan as province, China
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29
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The efficacy of immersive virtual reality surgical simulator training for pedicle screw placement: a randomized double-blind controlled trial. INTERNATIONAL ORTHOPAEDICS 2020; 44:927-934. [PMID: 32047963 DOI: 10.1007/s00264-020-04488-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 01/15/2020] [Indexed: 10/25/2022]
Abstract
OBJECTIVE To verify whether the pedicle screw placement (PSP) skills of young surgeons receiving immersive virtual reality surgical simulator (IVRSS) training could be improved effectively and whether the IVRSS-PSP training mode could produce a real clinical value in clinical surgery. METHODS Twenty-four young surgeons were equally randomized to a VR group and a NON-VR group. Participants in VR group received IVRSS-PSP training, and those in NON-VR group used the conventional model of observing a spinal model first and then watching a teaching video of spinal surgery for 40 minutes x five. The nailing outcome of the participants before and after training was evaluated by statistical analysis in both groups. RESULTS Post-training data analysis showed that the success rate and accuracy rate of screw placement in VR group and NON-VR group were 82.9% and 69.6% vs. 74.2% and 55.4%, respectively, showing statistically significant differences between the two groups by chi-square test (P < 0.05). CONCLUSION The present study demonstrated that IVRSS-PSP was helpful to improve the success rate of PSP for young surgeons, and may provide valuable reference for PSP training of young surgeons. In addition, our study also showed a promising potential of the VR technology in surgical simulation training.
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30
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Li Z, Chen J, Zhu QA, Zheng S, Zhong Z, Yang J, Yang D, Jiang H, Jiang W, Zhu Y, Sun D, Huang W, Chen J. A preliminary study of a novel robotic system for pedicle screw fixation: A randomised controlled trial. J Orthop Translat 2020; 20:73-79. [PMID: 31908936 PMCID: PMC6939109 DOI: 10.1016/j.jot.2019.09.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 09/02/2019] [Accepted: 09/04/2019] [Indexed: 01/02/2023] Open
Abstract
Background and objective Existing orthopaedic robotic systems are almost restricted to provide guidance for trajectory direction. In the present study, a novel spinal robotic system with automatic drilling power was introduced. The aim of this study is to evaluate the feasibility and safety in pedicle screw insertion of posterior lumbar interbody fusion assisted by this novel robotic system. Methods and materials A randomised controlled trial was conducted for 17 participants who were required posterior lumbar interbody fusion process. Seven (3 M/4 F) were randomly assigned to the robot-assisted group (RA group), and the other ten (4 M/6 F) were assigned to the conventional technique group (FH group). A novel robotic system was used in the RA group. All measurements were based on postoperative computed tomography (CT) data. Accuracy of screw insertion was determined using the Gertzbein and Robbins Scale. Precision was measured by the entry point deviation distance and the trajectory rotation. Other variables included operation time, radiation time, length of stay, and screw-related complications. Result A total of 82 pedicle screws were placed in the 17 participants. In the RA group, 90.6% of screws placed were Grade A, and 9.4% were Grade B. In the FH group, 78.0% of screws were Grade A, 20.0% were Grade B, and 2.0% were Grade C. No statistical difference was found in the operation time, radiation time per case, and length of stay between both groups. The radiation time per screw is significantly lower in the RA group. No screw-related complications or revision occurred in the present study. Conclusion The outcome of screw accuracy of this robotic system was comparable with that of experienced surgeons, and no screw-related complication was found in the RA group during hospitalisation. In addition, radiation time per screw in the robotic group was significantly lower than that in the conventional group, which shows the potential to reduce radiation exposure of pedicle screw fixation assisted by this robotic system. Translational potential Our study shows that pedicle screw fixation assisted by "Orthbot" system is accurate and safe. It is concluded that this novel robotic system offers a new option for internal implantation in spine surgery.
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Affiliation(s)
- Zongze Li
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jianting Chen
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Qing-An Zhu
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Shaoli Zheng
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zhaoming Zhong
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jincheng Yang
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Dehong Yang
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Hui Jiang
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Wangsheng Jiang
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yongjian Zhu
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Donghui Sun
- Xinjunte Smart Medical Equipment Co.Ltd, Shenzhen, China
| | - Wei Huang
- Xinjunte Smart Medical Equipment Co.Ltd, Shenzhen, China
| | - Jiarui Chen
- Xinjunte Smart Medical Equipment Co.Ltd, Shenzhen, China
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31
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Junaid M, Afzal A, Kalsoom A, Bukhari SS. Freehand pedicle screw fixation: A safe recipe for dorsal, lumbar and sacral spine. Pak J Med Sci 2019; 35:680-684. [PMID: 31258575 PMCID: PMC6572961 DOI: 10.12669/pjms.35.3.981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Objective: To determine outcome of freehand pedicle screw fixation for dorsal, lumbar and sacral fractures at a tertiary care centre in the developing world. Methods: A retrospective review was performed of 150 consecutive patients who underwent pedicle screw fixation from January 1, 2012 to 31st December 2017. A total of 751 pedicle screws were placed. Incidence and extent of cortical breach by misplaced pedicle screw was determined by review of intra-operative and post-operative radiographs and/or computed tomography. Results: Among the total 751 free hand placed pedicle screws, four screws (0.53%) were repositioned due to a misdirected trajectory towards the disc space. six screws (0.79%) were identified to have cause moderate breach while four screws (0.53%) cause severe breach. There was no occurrence of iatrogenic nerve root damage or violation of the spinal canal. Conclusion: Free hand pedicle screw placement based on external landmarks showed remarkable safety and accuracy in our center. The authors conclude that assiduous adherence to technique and preoperative planning is vital to success.
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Affiliation(s)
- Muhammad Junaid
- Dr. Muhammad Junaid, FCPS IFAANS, Department of Neurosurgery, PNS Shifa Hospital, Karachi, Pakistan
| | - Ali Afzal
- Dr. Ali Afzal, FCPS, Department of Neurosurgery, Jinnah Postgraduate Medical Center, Karachi, Pakistan
| | - Anisa Kalsoom
- Dr. Anisa Kalsoom, FCPS, Department of Radiology, Fauji Foundation Hospital, Rawalpindi, Pakistan
| | - Syed Sarmad Bukhari
- Dr. Syed Sarmad Bukhari, MBBS, Department of Neurological Surgery, Aga Khan University Hospital, Karachi, Pakistan
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32
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Fridley J, Gokaslan ZL. The evolution of surgical management for vertebral column tumors. J Neurosurg Spine 2019; 30:417-423. [PMID: 30933909 DOI: 10.3171/2018.12.spine18708] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Accepted: 12/14/2018] [Indexed: 11/06/2022]
Abstract
In BriefThere has been a significant shift in treatment paradigms for both primary and metastatic spine tumors over the last several decades. This article highlights some of the more important treatment advances that practitioners should be made aware of. It is important to not only incorporate these changes into individual practice but also appreciate the treatment trends that herald a significantly different future for spine tumor treatment.
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Perdomo-Pantoja A, Ishida W, Zygourakis C, Holmes C, Iyer RR, Cottrill E, Theodore N, Witham TF, Lo SFL. Accuracy of Current Techniques for Placement of Pedicle Screws in the Spine: A Comprehensive Systematic Review and Meta-Analysis of 51,161 Screws. World Neurosurg 2019; 126:664-678.e3. [PMID: 30880208 DOI: 10.1016/j.wneu.2019.02.217] [Citation(s) in RCA: 84] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 02/21/2019] [Accepted: 02/22/2019] [Indexed: 01/10/2023]
Abstract
BACKGROUND Pedicle screws (PSs) are routinely used for stabilization to enhance fusion in a variety of spinal diseases. Although the accuracy of different PS placement methods has been previously reported, most of these studies have been limited to 1 or 2 techniques. The purpose was to determine the current accuracy of PS placement among 4 modalities of PS insertion (freehand [FH], fluoroscopy-assisted [FA], computed tomography navigation-guided [CTNav], and robot-assisted [RA]) and analyze variables associated with screw misplacement. METHODS A systematic review was performed of peer-reviewed articles reporting PS accuracy of 1 technique from January 1990 to June 2018. Accuracy of PS placement, PS insertion technique, and pedicle breach (PB) data were collected. A meta-analysis was performed to estimate the overall pooled (OP) rates of PS accuracy as a primary outcome, stratified by screw insertion techniques. Potential determinants were analyzed via meta-regression analyses. RESULTS Seventy-eight studies with 7858 patients, 51,161 PSs, and 3614 cortical PBs were included. CTNav showed the highest PS placement accuracy compared with other techniques: OP accuracy rates were 95.5%, 93.1%, 91.5%, and 90.5%, via CTNav, FH, FA, and RA techniques, respectively. RA and CTNav were associated with the highest PS accuracy in the thoracic spine, compared with FH. CONCLUSIONS The OP data show that CTNav has the highest PS accuracy rates. Thoracic PSs were associated with lower accuracy rates; however, RA showed fewer breaches in the thoracic spine compared with FH and FA. Given the heterogeneity among studies, further standardized and comparative investigations are required to confirm our findings.
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Affiliation(s)
| | - Wataru Ishida
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Corinna Zygourakis
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Christina Holmes
- Florida A&M University-Florida State University College of Engineering, Tallahassee, Florida, USA
| | - Rajiv R Iyer
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ethan Cottrill
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Nicholas Theodore
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Timothy F Witham
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Sheng-Fu L Lo
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
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Human versus Robot: A Propensity-Matched Analysis of the Accuracy of Free Hand versus Robotic Guidance for Placement of S2 Alar-Iliac (S2AI) Screws. Spine (Phila Pa 1976) 2018; 43:E1297-E1304. [PMID: 29672421 DOI: 10.1097/brs.0000000000002694] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Retrospective matched cohort analysis. OBJECTIVE To compare the accuracy of S2 alar-iliac (S2AI) screw placement by robotic guidance versus free hand technique. SUMMARY OF BACKGROUND DATA Spinopelvic fixation utilizing S2AI screws provides optimal fixation across the lumbosacral junction allowing for solid fusion, especially in long segment fusion constructs. Traditionally, S2AI screw placement has required fluoroscopic guidance for accurate screw placement. Herein, we present the first series comparing a free hand and robotic-guided technique for S2AI screw placement. METHODS Sixty-eight consecutive patients who underwent S2AI screw placement by either a free hand or robotic technique between 2015 and 2016 were reviewed. Propensity score-matching was utilized to control for preoperative characteristic imbalances. Screw position and accuracy were evaluated using three-dimensional manipulation of computed tomography scan reconstructions from intraoperative O-arm imaging. RESULTS A total of 51 patients (105 screws) were matched, 28 (59 screws) in the free hand group (FHG) and 23 (46 screws) in the robot group (RG). The mean age in the FHG and RG were 57.9 ± 14.6 years and 61.6 ± 12.0 years (P = 0.342), respectively. The average caudal angle in the sagittal plane was significantly larger in the RG (31.0 ± 10.0° vs. 25.7 ± 8.8°, P = 0.005). There was no difference between the FHG and RG in the horizontal angle, measured in the axial plane using the posterior superior iliac spine (PSIS) as a reference (41.1 ± 8.1° vs. 42.8 ± 6.6°, P = 0.225), or the S2AI to S1 screw angle (9.4 ± 7.0° vs. 11.3 ± 9.9°, P = 0.256), respectively. There was no difference in the overall accuracy between FHG and RG (94.9% vs. 97.8%, P = 0.630). Additionally, there were no significant intraoperative neurovascular or visceral complications associated with S2AI screw placement. CONCLUSION Free hand and robotic-guided S2AI screw placement both prove to be safe, accurate, and reliable techniques for achieving spinopelvic fixation. LEVEL OF EVIDENCE 3.
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Radcliff K, Smith H, Kalantar B, Isaacs R, Woods B, Vaccaro AR, Brannon J. Feasibility of Endoscopic Inspection of Pedicle Wall Integrity in a Live Surgery Model. Int J Spine Surg 2018; 12:241-249. [PMID: 30276081 DOI: 10.14444/5030] [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: 11/20/2022] Open
Abstract
Background Perforations of the pedicle wall during cannulation can occur with experienced surgeons. Direct endoscopic visualization has not been used to inspect pedicles previously due to bone bleeding obscuring the camera visualization. The hypothesis of this study was that endoscopic visualization of pedicle wall integrity was technically feasible and would enable identification of clinically significant pedicle breaches. Methods A live porcine model was used. Eight lumbar pedicles were cannulated. Clinically significant breaches were created. An endoscope was introduced and was used to inspect the pedicles. Results All lumbar pedicles were endoscopically visible at a systolic pressure of 100 mm Hg. Clinically relevant anatomic structures and iatrogenic pathology, such as medial, lateral, and anterior breaches, were identified. There were no untoward events resulting from endoscopic inspection of the pedicle endosteal canal. Conclusions Endoscopic inspection of lumbar pedicles was safe and effective. The findings on endoscopic inspection corresponded with the ball-tip probe palpation techniques. Additional techniques, such as selection between 2 tracts, was possible with the endoscopic technique.
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Affiliation(s)
- Kristen Radcliff
- Department of Orthopedic Surgery, Thomas Jefferson University, Rothman Institute, Egg Harbor, New Jersey
| | - Harvey Smith
- Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Bobby Kalantar
- Department of Orthopedic Surgery, Georgetown University, Washington, DC
| | - Robert Isaacs
- Department of Neurological Surgery, Duke University, Durham, North Carolina
| | - Barrett Woods
- Department of Orthopedic Surgery, Thomas Jefferson University, Rothman Institute, Egg Harbor, New Jersey
| | - Alexander R Vaccaro
- Department of Orthopedic Surgery, Thomas Jefferson University, Rothman Institute, Egg Harbor, New Jersey
| | - James Brannon
- Orthopedic Sciences, Inc, Seal Beach, California, Joint Preservation Institute of Kansas, Overland Park, Kansas
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Park SM, Shen F, Kim HJ, Kim H, Chang BS, Lee CK, Yeom JS. How Many Screws Are Necessary to Be Considered an Experienced Surgeon for Freehand Placement of Thoracolumbar Pedicle Screws?: Analysis Using the Cumulative Summation Test for Learning Curve. World Neurosurg 2018; 118:e550-e556. [DOI: 10.1016/j.wneu.2018.06.236] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 06/27/2018] [Accepted: 06/28/2018] [Indexed: 11/29/2022]
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Abstract
STUDY DESIGN A cadaveric biomechanical study designed to test the pullout strength of pedicle screws. OBJECTIVE To evaluate the pullout strength of redirected pedicle screws with a larger diameter following lateral wall breach, redirected pedicle screws of the same diameter following medial wall breach, and redirected pedicle screws with a larger diameter following medial wall breach. SUMMARY OF BACKGROUND DATA Screw malposition is one of the main pitfalls of inserting pedicle screws. Intraoperatively a malpositioned screw is redirected and inserted along the correct axis. METHODS Forty-seven vertebrae (T9-L5) were harvested from eight fresh cadaveric spines. The 18 pedicle screws that breached the lateral wall were then removed and redirected using a pedicle screw of 1 mm larger in diameter. The 16 pedicle screws that had breached the medial wall were then removed and redirected using a pedicle screw of the same diameter. The other 13 pedicle screws that had breached the medial wall were then removed and redirected using a pedicle screw of 1 mm larger in diameter. The pullout strength was measured. RESULTS Following lateral wall breach, mean pullout strength for the larger redirected screws was 46.9% greater than that of the correctly aligned screws. Following medial wall breach, mean pullout strength for the redirected screws of the same diameter was 20.6% less than that of the correctly aligned screws. Mean pullout strength for the larger pedicle screws following medial wall breach was 27.3% more than that of the correctly aligned screws. CONCLUSION Redirected pedicle screws of larger diameter after a lateral or medial pedicle breach show recovery of pullout strength. However, the pullout strength of redirected pedicle screws of the same diameter after a medial pedicle breach is significantly less than that of correctly aligned screws. LEVEL OF EVIDENCE 1.
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Abstract
STUDY DESIGN Anatomic study using computed tomographic scans. OBJECTIVE The purpose of this paper was to determine the trajectory of pedicle screw insertions, in regard to posterior bony landmarks encountered during standard posterior exposure of the spine between the seventh cervical (C7) and the fifth thoracic (T5) vertebrae, when lateral fluoroscopic and radiographic guidance may be obstructed by the scapula and shoulders. SUMMARY OF BACKGROUND DATA Only a few studies have evaluated the intraoperative sagittal trajectory of pedicle screw insertion. MATERIALS AND METHODS We assessed 64 participants of a health screening program using whole-spine computed tomographic scans. On the basis of 5 previously reported methods, we designed 3 freehand trajectories: lamina surface method (angle between the superior vertebral endplate and the surface of the lamina), spinous process method (angle between the superior vertebral endplate and a line connecting the tips of the index spinous process and the one cephalad to it), and facet tilt method (angle between the superior endplate and the superior facet tilt). We calculated each of the angles for the C7-T5 vertebrae and determined the most reliable method using coefficients of variation (CV) and intraobserver and interobserver reliability. RESULTS The lamina surface method had the smallest CVs for C7 and T1, and the mean angles were larger than 90 degrees (range, 94.7-102.4 degrees). The spinous process method had the smallest CVs between T2 and T5, and the mean angles were <90 degrees (range, 85.0-87.0 degrees). The intraobserver and interobserver reliabilities were good or excellent for both methods. CONCLUSIONS The ideal sagittal trajectories for pedicle screw insertion are nearly orthogonal to the lamina surface or the line connecting the spinous processes, but were different for each of the vertebrae. The lamina surface method was the most reliable for C7 and T1, whereas the spinous process method was most reliable between T2 and T5. LEVEL OF EVIDENCE Level III.
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Accuracy of Freehand Pedicle Screw Placement in Surgical Correction of Thoracolumbar Kyphosis Secondary to Ankylosing Spondylitis: A Computed Tomography Investigation of 2314 Consecutive Screws. World Neurosurg 2018; 116:e850-e855. [PMID: 29807178 DOI: 10.1016/j.wneu.2018.05.116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 05/16/2018] [Accepted: 05/17/2018] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To evaluate the accuracy and safety of freehand pedicle screw placement in surgical correction for thoracolumbar kyphosis caused by ankylosing spondylitis (AS). METHODS We retrospectively reviewed 266 consecutive patients with AS who underwent osteotomy for kyphosis correction with freehand screw insertion from January 1998 to April 2015 at our institution. A total of 2314 pedicle screws in 158 patients with AS with postoperative computed tomography scans were included in the study. Postoperative computed tomography was performed to classify accuracy of screws, using the established Gertbein classification (grade 0: no perforation, grade 1: perforation <2 mm, grade 2: perforation between 2 and 4 mm, and grade 3: perforation >4 mm). Patients were divided into 2 groups according to coronal Cobb angle: group A (n = 21, Cobb angle ≥10°), group B (n = 137, Cobb angle <10°). RESULTS Among the 2314 pedicle screws, 2168 pedicle screw placements were categorized as grade 0, 71 were grade 1, 51 were grade 2, and 24 were grade 3. Breaches occurred more frequently in L1-S1 than the thoracic spine (7.1% and 5.4%, respectively). T5 (25.0%) and S1 (17.7%) experienced the greatest breach rate, whereas T8, L1, and L3 had the lowest breach rate. The breach rate of group A was greater than that of group B (7.9% vs. 6.1%). None of the breaches resulted in either neurologic deficits or vascular complications. CONCLUSIONS Freehand pedicle screw placement can be performed safely with acceptable breach rate in patients with AS and thoracolumbar kyphosis.
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Satarasinghe P, Hamilton KD, Tarver MJ, Buchanan RJ, Koltz MT. Thoracic, Lumbar, and Sacral Pedicle Screw Placement Using Stryker-Ziehm Virtual Screw Technology and Navigated Stryker Cordless Driver 3: Technical Note. J Clin Med 2018; 7:jcm7040084. [PMID: 29673199 PMCID: PMC5920458 DOI: 10.3390/jcm7040084] [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: 04/05/2018] [Revised: 04/13/2018] [Accepted: 04/13/2018] [Indexed: 11/16/2022] Open
Abstract
OBJECT Utilization of pedicle screws (PS) for spine stabilization is common in spinal surgery. With reliance on visual inspection of anatomical landmarks prior to screw placement, the free-hand technique requires a high level of surgeon skill and precision. Three-dimensional (3D), computer-assisted virtual neuronavigation improves the precision of PS placement and minimization steps. METHODS Twenty-three patients with degenerative, traumatic, or neoplastic pathologies received treatment via a novel three-step PS technique that utilizes a navigated power driver in combination with virtual screw technology. (1) Following visualization of neuroanatomy using intraoperative CT, a navigated 3-mm match stick drill bit was inserted at an anatomical entry point with a screen projection showing a virtual screw. (2) A Navigated Stryker Cordless Driver with an appropriate tap was used to access the vertebral body through a pedicle with a screen projection again showing a virtual screw. (3) A Navigated Stryker Cordless Driver with an actual screw was used with a screen projection showing the same virtual screw. One hundred and forty-four consecutive screws were inserted using this three-step, navigated driver, virtual screw technique. RESULTS Only 1 screw needed intraoperative revision after insertion using the three-step, navigated driver, virtual PS technique. This amounts to a 0.69% revision rate. One hundred percent of patients had intraoperative CT reconstructed images taken to confirm hardware placement. CONCLUSIONS Pedicle screw placement utilizing the Stryker-Ziehm neuronavigation virtual screw technology with a three step, navigated power drill technique is safe and effective.
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Affiliation(s)
- Praveen Satarasinghe
- Division of Neurosurgery, Department of Surgery and Perioperative Care, Dell Medical School, University of Texas at Austin, Austin, TX 78712, USA.
| | - Kojo D Hamilton
- Department of Neurosurgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.
| | - Michael J Tarver
- Division of Neurosurgery, Department of Surgery and Perioperative Care, Dell Medical School, University of Texas at Austin, Austin, TX 78712, USA.
| | - Robert J Buchanan
- Division of Neurosurgery, Department of Surgery and Perioperative Care, Dell Medical School, University of Texas at Austin, Austin, TX 78712, USA.
- Department of Neurosurgery, Seton Brain and Spine Institute, Austin, TX 78712, USA.
| | - Michael T Koltz
- Division of Neurosurgery, Department of Surgery and Perioperative Care, Dell Medical School, University of Texas at Austin, Austin, TX 78712, USA.
- Department of Neurosurgery, Seton Brain and Spine Institute, Austin, TX 78712, USA.
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Rexiti P, Abulizi Y, Muheremu A, Wang S, Maimaiti M, Guo H, Sheng W. Anatomical and radiologic characteristics of isthmus parameters in guiding pedicle screw placement. J Int Med Res 2018; 46:2386-2397. [PMID: 29619849 PMCID: PMC6023064 DOI: 10.1177/0300060518762986] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objective To study the clinical application of lumbar isthmus parameters in guiding pedicle screw placement. Methods Lumbar isthmus parameters were measured in normal lumbar x-rays and cadaveric specimens from a Chinese Han population. Distance between the medial pedicle border and lateral isthmus border was recorded as a 'D' value and was compared between X-rays and cadavers. Orthopaedic surgeons estimated different distances (2-6 mm) and angles (5-20°), and bias ratios between estimated and real values were compared. Orthopaedic residents placed pedicle screws on cadaveric specimens before and after application of the 'D' value, and screw placement accuracy was compared. Results Except for L4 vertebrae, significant differences in the 'D' value were found between 25 cadaveric specimens and x-ray films from 120 patients. Distances and angles estimated by 40 surgeons were significantly different from all real values, except 2 mm distance. Accuracy of pedicle screw placement by six orthopaedic residents was significantly improved by applying the 'D' value. Conclusions Surgeon estimates of distance were more accurate than angle estimates. Addition of a 'D' value to conventional parameters may significantly improve pedicle screw placement accuracy in lumbar spine surgery.
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Affiliation(s)
- Paerhati Rexiti
- 1 Department of Spine Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Yakufu Abulizi
- 1 Department of Spine Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Aikeremujiang Muheremu
- 2 Department of Spine Surgery, Sixth Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Shuiquan Wang
- 1 Department of Spine Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Maierdan Maimaiti
- 1 Department of Spine Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Hailong Guo
- 1 Department of Spine Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
| | - Weibin Sheng
- 1 Department of Spine Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China
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Sun ZF, Yang KX, Chen HT, Sui T, Yang L, Ge DW, Tang J, Cao XJ. A novel entry point for pedicle screw placement in the thoracic spine. J Biomed Res 2018; 32:123-129. [PMID: 28866657 PMCID: PMC5895566 DOI: 10.7555/jbr.31.20160037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study was aimed to introduce a novel entry point for pedicle screw fixation in the thoracic spine and compare it with the traditional entry point. A novel entry point was found with the aim of improving accuracy, safety and stability of pedicle screw technique based on anatomical structures of the spine. A total of 76 pieces of normal thoracic CT images at the transverse plane and the thoracic pedicle anatomy of 6 cadaveric specimens were recruited. Transverse pedicle angle (TPA), screw length, screw placement accuracy rate and axial pullout strength of the two different entry point groups were compared. There were significant differences in the TPA, screw length, and the screw placement accuracy rate between the two groups (P<0.05). The maximum axial pullout strength of the novel entry point group was slightly larger than that of the traditional group. However, the difference was not significant (P>0.05). The novel entry point significantly improved the accuracy, stability and safety of pedicle screw placement. With reference to the advantages above, the new entry point can be used for spinal internal fixations in the thoracic spine.
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Affiliation(s)
- Zhi-Feng Sun
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Kai-Xiang Yang
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Hong-Tao Chen
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Tao Sui
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Lei Yang
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Da-Wei Ge
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Jian Tang
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xiao-Jian Cao
- Department of Orthopaedics, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
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Masuda S, Onishi E, Ota S, Fujita S, Sueyoshi T, Hashimura T, Yasuda T. Vertebroplasty Using Allograft Bone Chips with Posterior Instrumented Fusion in the Treatment of Osteoporotic Vertebral Fractures with Neurological Deficits. Spine Surg Relat Res 2018; 3:249-254. [PMID: 31440684 PMCID: PMC6698507 DOI: 10.22603/ssrr.2018-0102] [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: 11/19/2018] [Accepted: 12/19/2018] [Indexed: 11/26/2022] Open
Abstract
Introduction In general, osteoporotic vertebral fractures with neurological deficits require surgery. However, the ideal surgical method remains controversial. We evaluated the efficacy of combining posterior instrumented fusion and vertebroplasty using allograft bone chips. Methods Twelve patients (five men, seven women; age 68-84 years, mean age 75.9 years) with osteoporotic vertebral fractures with neurological deficits were reviewed retrospectively. They underwent posterior instrumented fusion and vertebroplasty, using allograft bone, at our institution between January 2007 and June 2016. We assessed the surgical results, radiologically and neurologically, after a mean follow-up of 37.3 months. Results The mean local kyphosis angle was 10° before surgery, −3.3° immediately after surgery, and 4.4° at follow-up. The average spinal canal compromise was 26.9% before surgery and 19.5% at follow-up. All patients achieved bony fusion and none needed additional surgery. All patients improved by at least one grade on the modified Frankel grading system. Conclusions Combining vertebroplasty, using allograft bone chips, and posterior instrumented fusion appears to be an effective option for osteoporotic vertebral fractures with neurological deficits.
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Affiliation(s)
- Soichiro Masuda
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
| | - Eijiro Onishi
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
| | - Satoshi Ota
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
| | - Satoshi Fujita
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
| | - Tatsuya Sueyoshi
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
| | - Takumi Hashimura
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
| | - Tadashi Yasuda
- Department of Orthopedic Surgery, Kobe City Medical Center General Hospital, Hyogo, Japan
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Azimifar F, Hassani K, Saveh AH, Ghomsheh FT. A medium invasiveness multi-level patient's specific template for pedicle screw placement in the scoliosis surgery. Biomed Eng Online 2017; 16:130. [PMID: 29137676 PMCID: PMC5686850 DOI: 10.1186/s12938-017-0421-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 11/07/2017] [Indexed: 11/25/2022] Open
Abstract
Background Several methods including free-hand technique, fluoroscopic guidance, image-guided navigation, computer-assisted surgery system, robotic platform and patient’s specific templates are being used for pedicle screw placement. These methods have screw misplacements and are not always easy to be applied. Furthermore, it is necessary to expose completely a large portions of the spine in order to access fit entirely around the vertebrae. Methods In this study, a multi-level patient’s specific template with medium invasiveness was proposed for pedicle screw placement in the scoliosis surgery. It helps to solve the problems related to the soft tissues removal. After a computer tomography (CT) scan of the spine, the templates were designed based on surgical considerations. Each template was manufactured using three-dimensional printing technology under a semi-flexible post processing. The templates were placed on vertebras at four points—at the base of the superior-inferior articular processes on both left–right sides. This helps to obtain less invasive and more accurate procedure as well as true-stable and easy placement in a unique position. The accuracy of screw positions was confirmed by CT scan after screw placement. Results The result showed the correct alignment in pedicle screw placement. In addition, the template has been initially tested on a metal wire series Moulage (height 70 cm and material is PVC). The results demonstrated that it could be possible to implement it on a real patient. Conclusions The proposed template significantly reduced screw misplacements, increased stability, and decreased the sliding & the intervention invasiveness.
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Affiliation(s)
- Farhad Azimifar
- Department of Biomechanics, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Kamran Hassani
- Department of Biomechanics, Science and Research Branch, Islamic Azad University, Tehran, Iran.
| | - Amir Hossein Saveh
- Functional Neurosurgery Research Center, Shohada Tajrish Neurosurgical Comprehensive Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Farhad Tabatabai Ghomsheh
- Pediatric Neurorehabilitation Research Center, Ergonomics Department, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
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Positioning Performance of Power and Manual Drivers in Posterior Spinal Fusion Procedures. Appl Bionics Biomech 2017; 2017:7262841. [PMID: 28819344 PMCID: PMC5551465 DOI: 10.1155/2017/7262841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Accepted: 06/05/2017] [Indexed: 12/02/2022] Open
Abstract
This work presents an analysis and comparison of the efficacy of two methods for pedicle screw placement during posterior spinal fusion surgery. A total of 100 screws (64 manual and 36 power driven), all placed utilizing a surgical navigation system, were analyzed and compared. Final screw placement was compared to initial surgical plans using the navigation system, and the final screw locations were analyzed on the basis of angular deviation from these planned trajectories as well as screw translation within a critical reference plane. The power driver was found to insignificantly decrease the resulting angular deviation of these pedicle screws with a mean deviation of 3.35 degrees compared to 3.44 degrees with the manual driver (p = 0.853). Conversely, the power driver was found to increase the translational distance in the critical region, with mean deviations of 2.45 mm for the power driver compared to 1.54 mm with the manual driver. The increase in translational deviation was significant (p = 0.002) indicating that there may be some loss in performance from the adoption of the power driver.
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Jost GF, Walti J, Mariani L, Schaeren S, Cattin P. Inertial Measurement Unit-Assisted Implantation of Thoracic, Lumbar, and Sacral Pedicle Screws Improves Precision of a Freehand Technique. World Neurosurg 2017; 103:11-18. [PMID: 28249829 DOI: 10.1016/j.wneu.2017.02.079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 02/14/2017] [Accepted: 02/16/2017] [Indexed: 11/28/2022]
Abstract
OBJECTIVE A method applying inertial measurement units (IMUs) was developed to implant pedicle screws in the thoracic and lumbosacral spine. This was compared with a freehand technique. METHODS The study was done on 9 human cadavers. For each cadaver, a preoperative computed tomography (CT) scan was performed to measure the axial and sagittal tilt angles of the screw trajectories from T1 to S1. After the entry points were defined on the exposed spine, the IMU-equipped pedicle finder and screwdriver were used to reproduce these tilt angles and implant half of the screws. The other half was implanted with a freehand technique. Fluoroscopy was not used. The screw trajectories were analyzed on postoperative CTs. RESULTS A hundred and sixty-two screws were placed with use of the IMUs and 162 screws were implanted by freehand. The IMU-guided technique matched the planned trajectories significantly better than the freehand technique (axial tilt P < 0.001, sagittal tilt P < 0.001). With IMU assistance, the mean offsets between the planned and postoperatively measured tilt angles of the screws were 3.3 degrees ± 3.5 degrees for the axial plane (median 2 degrees, range 0-23 degrees) and 3.4 degrees ± 3 degrees for the sagittal plane (median 3 degrees, range 0-13 degrees). For the freehand technique, the mean offsets between the planned and postoperatively measured tilt angles of the screws were 5.6 degrees ± 4.5 degrees for the axial plane (median 5 degrees, range 0-31 degrees) and 6.7 degrees ± 5.4 degrees for the sagittal plane (median 6 degrees, range 0-33 degrees). CONCLUSIONS IMU-assisted implantation of pedicle screws may enhance the performance of a freehand technique in the thoracic and lumbosacral spine.
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Affiliation(s)
- Gregory F Jost
- Department of Spine Surgery, University Hospital Basel, Basel, Switzerland.
| | - Jonas Walti
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - Luigi Mariani
- Department of Neurosurgery, University Hospital Basel, Basel, Switzerland
| | - Stefan Schaeren
- Department of Spine Surgery, University Hospital Basel, Basel, Switzerland
| | - Philippe Cattin
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
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Merc M, Recnik G, Krajnc Z. Lumbar and sacral pedicle screw placement using a template does not improve the midterm pain and disability outcome in comparison with free-hand method. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 2017; 27:583-589. [DOI: 10.1007/s00590-017-1904-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 01/09/2017] [Indexed: 11/25/2022]
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The Pullout Strength of Pedicle Screws Following Redirection After Lateral Wall Breach or End-plate Breach. Spine (Phila Pa 1976) 2016; 41:1218-1223. [PMID: 27046637 DOI: 10.1097/brs.0000000000001600] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Using fresh cadavers, the biomechanical testing were used to examine the pullout strength of each pedicle screw. OBJECTIVE The aim of this study was to evaluate pullout strength of (1) a redirected pedicle screw following lateral wall breach; (2) a redirected pedicle screw following end-plate breach; and (3) a pedicle without redirection after end-plate breach without redirection. SUMMARY OF BACKGROUND DATA Screw malposition, such as lateral wall breach or end-plate breach, is one of the main pitfalls of inserting pedicle screws. METHODS From 17 fresh spines, 54 vertebrae were harvested. In each vertebra on one pedicle, the screw was inserted correctly down the axis of the pedicle, while on the other pedicle, the screw was inserted to breach the lateral wall or the end-plate. The 18 pedicle screws that breached the lateral wall were then removed and redirected along the correct axis of the pedicle. The 18 pedicle screws that breached the end-plate were removed and redirected along the correct axis of the pedicle. The 18 other pedicle screws that had breached the end-plate were not removed. The pullout force of pedicle screws was measured. RESULTS First, the mean pullout strength for the redirected screws following lateral wall breach was 24.0% less as compared with the correctly aligned screws. Second, the mean pullout strength for the redirected screws following end-plate breach was 23.3% less as compared with the correctly aligned screws. Third, the mean pullout strength for the pedicle screws end-plate breach was 7.6% less as compared with the correctly aligned screws. CONCLUSION The pullout strength of redirected pedicle screws after either a lateral pedicle breach or end-plate breach is significantly less than the pullout strength of correctly aligned screw. A pedicle screw that is not redirected after end-plate breach is weaker than a pedicle screw correctly aligned; however, the difference is not significant. LEVEL OF EVIDENCE N/A.
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The Indian Basket Trick: a case of delayed paraplegia with complete recovery, caused by misplaced thoracic pedicle screw. SPRINGERPLUS 2016; 5:944. [PMID: 27386388 PMCID: PMC4929096 DOI: 10.1186/s40064-016-2334-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/11/2016] [Indexed: 11/26/2022]
Abstract
Introduction Pedicle screw fixation allows purchase of all three spinal columns without encroaching into the spinal canal improving fracture fixation, as well as deformity correction. Fortunately, neurologic injury associated with pedicle screw malposition is rare. Case presentation A 19-year-old boy was surgically treated for severe right thoracic scoliosis associated with a Chiari Type 1 malformation and a C6 to T7 syringomyelia. Six months after the initial surgery, the patient was referred to our institution after three weeks of gait disturbances and repeated falls. Imaging showed the gross misplacement of the left T5 pedicle screw, which crossed the center of the vertebral canal. The initial surgery used a freehand technique of pedicle screw insertion, with anteroposterior and lateral postoperative X-ray control. During the surgery, no SEP modifications were noted during pedicle screw placement. However, after insertion of the second rod and scoliosis correction by posterior translation technique, SEP responses decreased considerably. Revision surgery was performed to remove the misplaced screw. During the first three months after screw removal, repeated clinical examinations showed progressive recovery of the neurological deficits. Gait and bladder functions were normal six months after screw removal, and clinical signs of spasticity disappeared. SEP explorations performed at final follow-up showed similar responses to those performed before the initial surgery for scoliosis correction Discussion and evaluation Neurologic injury associated with pedicle screw malposition is rare. In early or delayed neurological status worsening, intraoperative or postoperative imaging must be done to detect pedicle screw misplacement. In the current case, thanks to cobalt-chromium and titanium use, MRI and CT scan allowed good visualization of the spinal canal and spinal cord. Experimental studies have shown that neurophysiological monitoring of the spinal cord does not detect moderate compression. In that way, neurophysiological monitoring is an all-or-nothing technique which can misdiagnose early stage of spinal cord injuries. Major penetration of the spinal canal by pedicle screw may conduct to hardware removal. Conclusions In early or delayed neurological status worsening, intraoperative or postoperative imaging must be done to detect pedicle screw misplacement. In the current case, thanks to cobalt-chromium and titanium use, MRI and CT scan allowed good visualization of the spinal canal and spinal cord. Major penetration of the spinal canal by pedicle screw may conduct to hardware removal.
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Hu Y, Yuan ZS, Spiker WR, Dong WX, Sun XY, Yuan JB, Zhang J, Zhu B. A comparative study on the accuracy of pedicle screw placement assisted by personalized rapid prototyping template between pre- and post-operation in patients with relatively normal mid-upper thoracic spine. 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 2016; 25:1706-15. [DOI: 10.1007/s00586-016-4540-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 03/18/2016] [Accepted: 03/19/2016] [Indexed: 11/28/2022]
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