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Visocchi M, Signorelli F. Craniovertebral Junction Surgical Approaches: State of Art. Adv Tech Stand Neurosurg 2024; 50:295-305. [PMID: 38592535 DOI: 10.1007/978-3-031-53578-9_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Surgical approaches directed toward craniovertebral junction (CVJ) can be addressed to the ventral, dorsal, and lateral aspects through a variety of 360° surgical corridors Herein, we report features, advantages, and limits of the updated technical support in CVJ surgery in clinical setting and dissection laboratories enriched by our preliminary surgical results of the simultaneous application of O-arm intraoperative neuronavigation and imaging system along with the 3D-4K EX in TOA for the treatment of CVJ pathologies.In the past 4 years, eight patients harboring CVJ compressive pathologies underwent one-step combined anterior neurosurgical decompression and posterior instrumentation and fusion technique with the aid of exoscope and O-arm. In our equipped Cranio-Vertebral Junction Laboratory, we use fresh cadavers (and injected "head and neck" specimens) whose policy, protocols, and logistics have already been elucidated in previous works. Five fresh-frozen adult specimens were dissected adopting an FLA. In these specimens, a TOA was also performed, as well as a neuronavigation-assisted comparison between transoral and transnasal explorable distances.A complete decompression along with stable instrumentation and fusion of the CVJ was accomplished in all the cases at the maximum follow-up (mean: 25.3 months). In two cases, the O-arm navigation allowed the identification of residual compression that was not clearly visible using the microscope alone. In four cases, it was not possible to navigate C1 lateral masses and C2 isthmi due to the angled projection unfitting with the neuronavigation optical system, so misleading the surgeon and strongly suggesting changing surgical strategy intraoperatively. In another case (case 4), it was possible to navigate and perform both C1 lateral masses and C2 isthmi screwing, but the screw placement was suboptimal at the immediate postoperative radiological assessment. In this case, the hardware displacement occurred 2 months later requiring reoperation.
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Affiliation(s)
- Massimiliano Visocchi
- Institute of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy
| | - Francesco Signorelli
- Institute of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy.
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Hou X, Tian Y, Xu N, Li H, Yan M, Wang S, Li W. Overstrain on the longitudinal band of the cruciform ligament during flexion in the setting of sandwich deformity at the craniovertebral junction: a finite element analysis. Spine J 2023; 23:1721-1729. [PMID: 37385409 DOI: 10.1016/j.spinee.2023.06.387] [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: 11/30/2022] [Revised: 05/31/2023] [Accepted: 06/17/2023] [Indexed: 07/01/2023]
Abstract
BACKGROUND CONTEXT In the setting of "sandwich deformity" (concomitant C1 occipitalization and C2-3 nonsegmentation), the C1-2 joint becomes the only mobile joint in the craniovertebral junction. Atlantoaxial dislocation develops earlier with severer symptoms in sandwich deformity, which has been hypothesized to be due to the repetitive excessive tension in the ligaments between C1 and C2. PURPOSE To elucidate whether and how the major ligaments of the C1-2 joint are affected in sandwich deformity, and to find out the ligament most responsible for the earlier development and severer symptoms of atlantoaxial dislocation in sandwich deformity. STUDY DESIGN A finite element (FE) analysis study. METHODS A three-dimensional FE model from occiput to C5 was established using anatomical data from a thin-slice CT scan of a healthy volunteer. Sandwich deformity was simulated by eliminating any C0-1 and C2-3 segmental motion respectively. Flexion torque was applied, and the range of motion of each segment and the tension sustained by the major ligaments of C1-2 (including the transverse and longitudinal bands of the cruciform ligament, the alar ligaments, and the apical ligament) were analyzed. RESULTS Tension sustained by the longitudinal band of the cruciform ligament and the apical ligament during flexion is significantly larger in the FE model of sandwich deformity. In contrast, tension in the other ligaments is not significantly changed in the sandwich deformity model compared with the normal model. CONCLUSIONS Considering the importance of the longitudinal band of the cruciform ligament to the stability of the C1-2 joint, our findings implicate that the early onset, severe dislocation, and unique clinical manifestations of atlantoaxial dislocation in patients with sandwich deformity are mainly due to the enlarged force loaded on the longitudinal band of the cruciform ligament. CLINICAL SIGNIFICANCE The enlarged force loaded on the longitudinal band of the cruciform ligament can add to its laxity and thus reducing its ability to restrict the cranial migration of the odontoid process. This is in accordance with our clinical experience that dislocation of the atlantoaxial joint in patients with sandwich deformity is mainly craniocaudal, which means severer cranial neuropathy, Chiari deformity, and syringomyelia, and more difficult surgical treatment.
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Affiliation(s)
- Xiangyu Hou
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Rd, Haidian District, Beijing, China; Engineering Research Center of Bone and Joint Precision Medicine, 49 North Garden Rd, Haidian District, Beijing, China; Beijing Key Laboratory of Spinal Disease Research, 49 North Garden Rd, Haidian District, Beijing, China
| | - Yinglun Tian
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Rd, Haidian District, Beijing, China; Engineering Research Center of Bone and Joint Precision Medicine, 49 North Garden Rd, Haidian District, Beijing, China; Beijing Key Laboratory of Spinal Disease Research, 49 North Garden Rd, Haidian District, Beijing, China
| | - Nanfang Xu
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Rd, Haidian District, Beijing, China; Engineering Research Center of Bone and Joint Precision Medicine, 49 North Garden Rd, Haidian District, Beijing, China; Beijing Key Laboratory of Spinal Disease Research, 49 North Garden Rd, Haidian District, Beijing, China
| | - Hui Li
- Beijing Engineering and Technology Research Center for Medical Endoplants, Building 1, Yard 9, Chengwan Street, Haidian District, Beijing, China
| | - Ming Yan
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Rd, Haidian District, Beijing, China; Engineering Research Center of Bone and Joint Precision Medicine, 49 North Garden Rd, Haidian District, Beijing, China; Beijing Key Laboratory of Spinal Disease Research, 49 North Garden Rd, Haidian District, Beijing, China
| | - Shenglin Wang
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Rd, Haidian District, Beijing, China; Engineering Research Center of Bone and Joint Precision Medicine, 49 North Garden Rd, Haidian District, Beijing, China; Beijing Key Laboratory of Spinal Disease Research, 49 North Garden Rd, Haidian District, Beijing, China.
| | - Weishi Li
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Rd, Haidian District, Beijing, China; Engineering Research Center of Bone and Joint Precision Medicine, 49 North Garden Rd, Haidian District, Beijing, China; Beijing Key Laboratory of Spinal Disease Research, 49 North Garden Rd, Haidian District, Beijing, China
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Visocchi M, Signorelli F. Combined Transoral Exoscope and OARM-Assisted Approach for Craniovertebral Junction Surgery. New Trends in an Old-Fashioned Approach. ACTA NEUROCHIRURGICA. SUPPLEMENT 2023; 135:243-246. [PMID: 38153476 DOI: 10.1007/978-3-031-36084-8_37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
BACKGROUND The introduction of recent innovations in the field of intraoperative imaging and neuronavigation, such as the O-arm StealthStation, allows for obtaining crucial intraoperative data by performing safer and controlled surgical procedures. As part of the improvement of surgical visual magnification and wide expansion of surgical corridors, the 3D 4 K exoscope (EX) has nowadays become an interesting and useful tool. The transoral approach (TOA) is the historical gold-standard direct microsurgical route to ventral craniovertebral junction (CVJ). METHODS We herein report our experience, consisting of ten cases via TOA concerning the simultaneous application of an O-arm with a StealthStation navigation system (Medtronic, Memphis, TN) and an imaging system, along with the 3D 4 K exoscopes in the TOA, for the treatment of CVJ pathologies. RESULTS No intraoperative neurophysiological changes or postoperative infections occurred, but neurological improvement was evident in all the patients. A complete decompression and a stable instrumentation and fusion of the CVJ were accomplished in all cases at the maximum follow-up time. CONCLUSIONS With EX, the role of the surgeon becomes self-sufficient with better individual surgical freedom compared to endoscopic surgery and excellent 3D vision and magnification. O-arms offer absolutely reliable intraoperative support for more-effective CVJ decompression. Nevertheless, with O-arm-assisted neuronavigation, it can be difficult to navigate C1 lateral masses and C2 isthmi, and converting 3D into 2D real-time navigation can be quite complicated. Finally, the combination of an EX with an O-arm appears more time-consuming compared to the old-fashion one.
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Affiliation(s)
| | - Francesco Signorelli
- Institute of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy.
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Timothy J, Ivanov M, Tisell M, Marchesini N, Lafuente J, Foroglou N, Visocchi M, Olldashi F, Gonzalez-Lopez P, Rzaev J, Whitfield P, Peul WC, Rasulic L, Demetriades AK. Working in low- and middle-income countries: Learning from each other. BRAIN & SPINE 2022; 2:101689. [PMID: 36506295 PMCID: PMC9729805 DOI: 10.1016/j.bas.2022.101689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 10/02/2022] [Accepted: 11/01/2022] [Indexed: 11/05/2022]
Abstract
•Barriers may limit LMICs-HICs collaborations: infrastructure, equipment's lack/inadequacy, political issues, brain drain.•Local training is crucial for universal health coverage; several activities are headed by Global Neurosurgery organisations.•The EANS Global and Humanitarian Neurosurgery Committee aims to become a gateway for partnerships between HICs and LMICs.
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Affiliation(s)
- Jake Timothy
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, Leeds General Infirmary, Leeds, UK
| | - Marcel Ivanov
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, Sheffield Teaching Hospital, NHS Foundation Trust, UK
| | - Magnus Tisell
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, Sahlgrenska University Hospital, Göteborg, Sweden
| | - Nicolò Marchesini
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, University Hospital Borgo Trento, Verona, Italy,Corresponding author. Department of Neurosurgery, University Hospital Borgo Trento, Piazzale Stefani 1, 37126, Verona, Italy.
| | - Jesus Lafuente
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Spine Center, Hospital Del Mar, Barcelona, Spain
| | - Nikos Foroglou
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, AHEPA University Hospital, Medical School, Aristotle University of Thessaloniki, Greece
| | - Massimiliano Visocchi
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,CVJ Surgery Unit, Institute of Neurosurgery, Catholic University of Rome, Italy
| | - Fatos Olldashi
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, University Hospital of Trauma, Tirana, Albania
| | - Pablo Gonzalez-Lopez
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, General University Hospital Alicante, Alicante, Spain
| | - Jamil Rzaev
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Federal Neurosurgical Center, Novosibirsk, Russian Federation
| | - Peter Whitfield
- Department of Neurosurgery, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Wilco C. Peul
- University Neurosurgical Center Holland, HMC-HAGA The Hague & LUMC Leiden, Netherlands
| | - Lukas Rasulic
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Faculty of Medicine, University of Belgrade, Clinic for Neurosurgery, University Clinical Center of Serbia, Belgrade, Serbia
| | - Andreas K. Demetriades
- Global and Humanitarian Neurosurgery Committee, European Association of Neurosurgical Societies (EANS), UK,Department of Neurosurgery, Royal Infirmary, Edinburgh, UK
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Fiani B, Jarrah R, Sarno E, Kondilis A, Pasko K, Musch B. An investigation of craniocervical stability post-condylectomy. Surg Neurol Int 2021; 12:380. [PMID: 34513147 PMCID: PMC8422489 DOI: 10.25259/sni_456_2021] [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: 05/08/2021] [Accepted: 06/23/2021] [Indexed: 12/03/2022] Open
Abstract
Background: Occipital condylectomy is often necessary to gain surgical access to various neurological pathologies. As the lateral limit of the craniovertebral junction (CVJ), partial condylectomy can lead to iatrogenic craniocervical instability. What was once considered an inoperable location is now the target of various complex neurosurgical procedures such as tumor resection and aneurysm clipping. Methods: In this study, we will review the anatomical structure of the CVJ and provide the first comprehensive assessment of studies investigating craniovertebral stability following condylectomy with the transcondylar surgical approaches. Furthermore, we discuss future considerations that must be evaluated to optimize the chances of preserving craniocervical stability postcondylectomy. Results: The current findings postulate upward of 75% of the occipital condyle can be resected without significantly affecting mobility of the CVJ. The current findings have only examined overall dimensions and have not established a significant correlation into how the shape of the occipital condyles can affect mobility. Occipitocervical fusion should only be considered after 50% condyle resection. In terms of indicators of anatomical stability, components of range of motion (ROM) such as the neutral zone (NZ) and the elastic zone (EZ) have been discussed as potential measures of craniocervical mobility. These components differ by the sense that the NZ has little ligament tension, whereas the EZ does represent ROM where ligaments experience tension. NZ is a more sensitive indicator of instability when measuring for instability postcondylectomy. Conclusion: Various transcondylar approaches have been developed to access this region including extreme-lateral and far-lateral condylectomy, with hopes of preserving as much of the condyle as possible and maintaining postoperative craniocervical stability.
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Affiliation(s)
- Brian Fiani
- Department of Neurosurgery, Desert Regional Medical Center, Palm Springs, California, United States
| | - Ryan Jarrah
- College of Arts and Sciences, University of Michigan Flint, Flint, United States
| | - Erika Sarno
- College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, United States
| | - Athanasios Kondilis
- College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, United States
| | - Kory Pasko
- School of Medicine, Georgetown University, Washington, District of Columbia, United States
| | - Brian Musch
- College of Osteopathic Medicine, William Carey University, Hattiesburg, Mississippi, United States
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Visocchi M, Mattogno PP, Ciappetta P, Barbagallo G, Signorelli F. Combined transoral exoscope and OArm-assisted approach for craniovertebral junction surgery: Light and shadows in single-center experience with improving technologies. JOURNAL OF CRANIOVERTEBRAL JUNCTION AND SPINE 2020; 11:293-299. [PMID: 33824559 PMCID: PMC8019117 DOI: 10.4103/jcvjs.jcvjs_176_20] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 11/04/2022] Open
Abstract
Background The introduction of recent innovations in the field of intraoperative imaging and neuronavigation, such as OArm Stealth Station, allows to obtain crucial intraoperative data by performing safer and controlled surgical procedures. As part of the improvement of surgical visual magnification and wide expansion of surgical corridors, the 3D-4K exoscope (EX) represents nowadays an interesting and useful tool. Transoral approach (TOA) represents the historical gold standard direct microsurgical route to ventral craniovertebral junction (CVJ). Methods We herein report a preliminary experience on 6 cases of 33 patients operated by TOA concerning the simultaneous application of OArm with Stealth Navigation system (Medtronic, Memphis, TN) and imaging system along with the 3D-4K EXs in TOA for the treatment of CVJ pathologies. Results Neither intraoperative neurophysiological changes nor postoperative infections occurred, but a neurological improvement was evident in all the patients. A complete decompression along with stable instrumentation and fusion of the CVJ was accomplished in all cases at the maximum follow-up (mean: 16.8 months). Conclusions With EX, the role of surgeon become self-sufficient with a better individual surgical freedom compared to endoscopic surgery and excellent 3D vision and magnification. OArm allows an absolutely reliable intraoperative support for a more effective CVJ decompression. Nevertheless, with OArm-assisted neuronavigation, it can be difficult to navigate C1 lateral masses and C2 isthmi, and to convert 3D into 2D real-time navigation, it can become quite complicate. Finally, the association of EX and OArm appears more time consuming compared to the old fashion one.
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Affiliation(s)
- Massimiliano Visocchi
- Institute of Neurosurgery, Operative Unit, Research Center and Master II Degree Surgical Approaches Craniovertebral Junction, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy
| | - Pier Paolo Mattogno
- Institute of Neurosurgery, Operative Unit, Research Center and Master II Degree Surgical Approaches Craniovertebral Junction, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy
| | | | - Giuseppe Barbagallo
- Departement of Neurological Surgery, Policlinico Gaspare Rodolico University Hospital, Catania, Italy
| | - Francesco Signorelli
- Institute of Neurosurgery, Operative Unit, Research Center and Master II Degree Surgical Approaches Craniovertebral Junction, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy
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