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He Y, Zhang M, Qin X, Huang C, Liu P, Tao Y, Wang Y, Guo L, Bao M, Li H, Mao Z, Li N, He Z, Wu B. Research process, recap, and prediction of Chiari malformation based on bicentennial history of nomenclature and terms misuse. Neurosurg Rev 2023; 46:316. [PMID: 38030943 DOI: 10.1007/s10143-023-02207-w] [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: 05/16/2023] [Revised: 10/15/2023] [Accepted: 10/29/2023] [Indexed: 12/01/2023]
Abstract
There is an absent systematic analysis or review that has been conducted to clarify the topic of nomenclature history and terms misuse about Chiari malformations (CMs). We reviewed all reports on terms coined for CMs for rational use and provided their etymology and future development. All literature on the nomenclature of CMs was retrieved and extracted into core terms. Subsequently, keyword analysis, preceding and predicting (2023-2025) compound annual growth rate (CAGR) of each core term, was calculated using a mathematical formula and autoregressive integrated moving average model in Python. Totally 64,527 CM term usage was identified. Of these, 57 original terms were collected and then extracted into 24 core-terms. Seventeen terms have their own featured author keywords, while seven terms are homologous. The preceding CAGR of 24 terms showed significant growth in use for 18 terms, while 13, three, three, and five terms may show sustained growth, remain stable, decline, and rare in usage, respectively, in the future. Previously, owing to intricate nomenclature, Chiari terms were frequently misused, and numerous seemingly novel but worthless even improper terms have emerged. For a very basic neuropathological phenomenon tonsillar herniation by multiple etiology, a mechanism-based nosology seems to be more conducive to future communication than an umbrella eponym. However, a good nomenclature also should encapsulate all characteristics of this condition, but this is lacking in current CM research, as the pathophysiological mechanisms are not elucidated for the majority of CMs.
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Affiliation(s)
- Yunsen He
- Department of Neurosurgery, Sichuan Lansheng Brain Hospital & Shanghai Lansheng Brain Hospital Investment Co., Ltd., 6 Anrong Road, Chadianzi Street, Jinniu District, Chengdu, 610036, Sichuan, China
| | - Mengjun Zhang
- Department of Neuropsychology, Sichuan Provincial Center for Mental Health, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, China
| | - Xiaohong Qin
- Department of Neuropsychology, Sichuan Provincial Center for Mental Health, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, China
| | - Caiquan Huang
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China
| | - Ping Liu
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China
| | - Ye Tao
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China
| | - Yishuang Wang
- Department of Radiology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, China
| | - Lili Guo
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China
| | - Mingbin Bao
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China
| | - Hongliang Li
- Department of Neurosurgery, Sichuan Lansheng Brain Hospital & Shanghai Lansheng Brain Hospital Investment Co., Ltd., 6 Anrong Road, Chadianzi Street, Jinniu District, Chengdu, 610036, Sichuan, China
| | - Zhenzhen Mao
- Emergency Department, Sichuan Taikang Hospital, Chengdu, 610000, Sichuan, China
| | - Nanxiang Li
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China
| | - Zongze He
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China.
| | - Bo Wu
- Department of Neurosurgery, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No.32, West Section 2, First Ring Road, Chengdu, 610072, Sichuan, China.
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Dietz N, Gruter BE, Haegler J, Cho SK, Tubbs RS, Spiessberger A. The modified occipital condyle screw: A quantitative anatomic study investigating the feasibility of a novel instrumented fixation technique for craniocervical fusion. JOURNAL OF CRANIOVERTEBRAL JUNCTION AND SPINE 2023; 14:175-180. [PMID: 37448506 PMCID: PMC10336899 DOI: 10.4103/jcvjs.jcvjs_27_23] [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: 03/05/2023] [Accepted: 04/12/2023] [Indexed: 07/15/2023] Open
Abstract
Study Design Prospective human anatomical study. Objective Occipitocervical fusion with occipital plate or condyle screws has shown higher failure rates in those with skeletal dysplasia. The modified occipital condyle screw connects the occipital condyle to the pars basilaris of the occipital bone that may achieve fortified bony purchase and serve as a more rigid fixation point. We evaluate anatomical feasibility of a novel cranial fixation technique designed to decrease risk of pseudarthrosis. Materials and Methods Occipital condyles were analyzed morphologically using multiplanar three-dimensional reconstructed, ultra-thin section computed tomography. The following parameters were obtained: occipital condyle length, maximal cross section, location of hypoglossal canal, axial and sagittal orientation of the long axis, occipital condyle pedicle (OCP) diameter, maximal length of OCP screw, and entry point. Results Forty patients with total of 80 occipital condyles were analyzed and the following measurements were obtained: occipital condyle length 24.1 mm (20.5-27.7, standard deviation [SD]: 2.2); condyle maximum axial cross-section 12.6 mm (9-15.8, SD: 1.9); length of OCP screw 38.9 mm (29.3-44, SD: 5.7); diameter of OCP 3.4 mm (3.2-3.6, SD: 0.2); clearance below hypoglossal canal 4.5 mm (3.4-7, SD: 1.1); and distance of screw entry point from condylar foramen 2 mm (range 0-4, SD 1.6). Conclusion The modified occipital condyle screw connects the condyle with the clivus through the pars basilaris and represents a safe and technically feasible approach to achieve craniocervical fusion in skeletally mature individuals. This cephalad anchor point serves as an alternate fixation point of the occipitocervical junction with increased strength of construct and decreased risk of hardware failure or pseudarthrosis given cortical bone purchase and longer screw instrumentation.
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Affiliation(s)
- Nicholas Dietz
- Department of Neurosurgery, University of Louisville, Louisville, KY, USA
| | - Basil Erwin Gruter
- Department of Neurosurgery, Cantonal Hospital Aarau, Tellstrasse, 5001 Aarau, Switzerland
| | - Joshua Haegler
- Department of Neurosurgery, Cantonal Hospital Aarau, Tellstrasse, 5001 Aarau, Switzerland
| | - Samuel K. Cho
- Department of Orthopedic Surgery, Icahn School of Medicine, Mount Sinai Hospital, New York, NY, USA
| | - R. Shane Tubbs
- Department of Neurosurgery, Tulane University, New Orleans, LA, USA
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Nicholson LL, Rao PJ, Lee M, Wong TM, Cheng RHY, Chan C. Reference values of four measures of craniocervical stability using upright dynamic magnetic resonance imaging. LA RADIOLOGIA MEDICA 2023; 128:330-339. [PMID: 36715785 PMCID: PMC10020271 DOI: 10.1007/s11547-023-01588-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 01/04/2023] [Indexed: 01/31/2023]
Abstract
PURPOSE To establish reference ranges for four most commonly used diagnostic measures of craniocervical instability (CCI) in three cervical sagittal positions. This necessitated development of a reliable measurement protocol using upright, dynamic MRI (udMRI), to determine differences in the extent of motion between positions, and whether age and sex correlate with these measures. MATERIALS AND METHODS Deidentified udMRIs of 50 adults, referred for reasons other than CCI, were captured at three positions (maximal flexion, maximal extension and neutral). Images were analyzed, providing measures of basion-axial interval, basion-axial angle, basion-dens interval (BDI) and the Grabb-Oakes line (GOL) for all three positions (12 measures per participant). All measures were independently recorded by a radiologist and neurosurgeon to determine their reliability. Descriptive statistics, correlations, paired and independent t-tests were used. Mean (± 2 SD) identified the reference range for all four measures at each craniocervical position. RESULTS The revised measurement protocol produced inter-rater reliability indices of 0.69-0.97 (moderate-excellent). Fifty adults' (50% male; mean age 41.2 years (± 9.7)) reference ranges for all twelve measures were reported. Except for the BDI and GOL when moving between neutral and full flexion, significant extents of movement were identified between the three craniocervical positions for all four measures (p ≤ 0.005). Only a minor effect of age was found. CONCLUSIONS This is the first study to provide a rigorous standardized protocol for four diagnostic measures of CCI. Reference ranges are established at mid and ends of sagittal cervical range corresponding to where exacerbations of signs and symptoms are commonly reported.
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Affiliation(s)
- Leslie L Nicholson
- School of Medical Sciences, The University of Sydney, Camperdown, NSW, Australia.
| | - Prashanth J Rao
- Macquarie University Hospital, Macquarie Park, NSW, Australia
- Faculty of Medicine and Health, Macquarie University, Macquarie Park, NSW, Australia
| | - Matthew Lee
- Radiology, Western Imaging Group, Blacktown, NSW, Australia
| | - Tsz Ming Wong
- Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Regen Hoi Yan Cheng
- Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Cliffton Chan
- School of Medical Sciences, The University of Sydney, Camperdown, NSW, Australia
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Spiessberger A, Newton PO, Mackenzie W, Samdani A, Miyanji F, Pahys J, Shah S, Sponseller P, Abel M, Phillips J, Marks M, Yaszay B. Posterior cervical spinal fusion in the pediatric population using modern adult instrumentation - clinical outcome and safety. Childs Nerv Syst 2023; 39:1573-1580. [PMID: 36688999 DOI: 10.1007/s00381-023-05834-2] [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: 10/14/2022] [Accepted: 01/06/2023] [Indexed: 01/24/2023]
Abstract
PURPOSE Traditionally, less rigid fixation techniques have been applied to the pediatric cervical spine. There is a lack of long-term outcome data for rigid fixation techniques. The purpose of this study was to define the clinical outcome and safety of posterior instrumented fusion in the pediatric population using adult posterior instrumentation. METHODS A multicenter, retrospective review of pediatric patients who underwent posterior cervical fusion using a 3.5 mm posterior cervical system for any indication was performed. Outcome parameters included complications, revision and fusion rates, operative time (OR), blood loss, and postoperative neurologic status. Outcomes were compared between patient groups (posterior only versus anterior/posterior approach, short versus intermediate versus long fusion, and between different etiologies) using Mann-Whitney and chi-square test. RESULTS Seventy-nine patients with a mean age of 9.9 years and mean follow-up of 2.8 years were included. At baseline 44 (56%) had an abnormal neurologic exam. Congenital deformities and basilar invagination were the most common indications for surgery. Posterior-only surgery was performed in 71 (90%) cases; mean number of levels fused was 4 (range 1-15). Overall, 4 (5%) operative complications and 4 (5%) revisions were reported at an average postoperative time of 2.6 years. Neurologic status remained unchanged in 74%, improved in 23%, and worsened in 3%. When comparing outcome measures between the various groups, 2 significant differences were found: OR was longer in the anterior/posterior approach group and decline of neuro status was more frequent in the long fusion group. CONCLUSION Posterior cervical fusion with an adult 3.5 mm posterior cervical system was safe in this cohort of 79 pediatric patients irrespective of surgical technique, fusion length, and etiology, resulting in a high fusion and low complication/revision rate.
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Affiliation(s)
- Alexander Spiessberger
- Division of Orthopedics & Scoliosis, Rady Children's Hospital, 3020 Children's Way, San Diego, CA, USA
| | - Peter O Newton
- Division of Orthopedics & Scoliosis, Rady Children's Hospital, 3020 Children's Way, San Diego, CA, USA
| | - William Mackenzie
- Spine and Scoliosis Center, Nemours Children's Hospital, Wilmington, DE, USA
| | - Amer Samdani
- Department of Orthopedics, Shriners Hospital for Children, Philadelphia, PA, USA
| | - Firoz Miyanji
- Department of Orthopedics, British Columbia Children's Hospital, Vancouver, BC, Canada
| | - Joshua Pahys
- Department of Orthopedics, Shriners Hospital for Children, Philadelphia, PA, USA
| | - Suken Shah
- Spine and Scoliosis Center, Nemours Children's Hospital, Wilmington, DE, USA
| | - Paul Sponseller
- Department of Orthopedics, Johns Hopkins Children's Center, Baltimore, MD, USA
| | - Mark Abel
- Department of Orthopedics, University of Virginia Medical Center, Charlottesville, VA, USA
| | - Jonathan Phillips
- Orlando Health Arnold Palmer Hospital for Children Center for Orthopedics, Orlando, FL, USA
| | - Michelle Marks
- Setting Scoliosis Straight Foundation, San Diego, CA, USA
| | - Burt Yaszay
- Department of Orthopedics and Sports Medicine, Seattle Children's Hospital, M/S OA.9.120, 4800 Sandpoint Way NE, Seattle, WA, 98105, USA.
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Rock MB, Zhao DY, Felbaum DR, Sandhu FA. Neurosurgical management of patients with Ehlers-Danlos syndrome: A descriptive case series. JOURNAL OF CRANIOVERTEBRAL JUNCTION AND SPINE 2023; 14:24-34. [PMID: 37213579 PMCID: PMC10198216 DOI: 10.4103/jcvjs.jcvjs_127_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/25/2022] [Indexed: 03/14/2023] Open
Abstract
Introduction Ehlers-Danlos syndrome (EDS) is a connective tissue disorder that has been linked to several neurological problems including Chiari malformations, atlantoaxial instability (AAI), craniocervical instability (CCI), and tethered cord syndrome. However, neurosurgical management strategies for this unique population have not been well-explored to date. The purpose of this study is to explore cases of EDS patients who required neurosurgical intervention to better characterize the neurological conditions they face and to better understand how neurosurgeons should approach the management of these patients. Methods A retrospective review was done on all patients with a diagnosis of EDS who underwent a neurosurgical operation with the senior author (FAS) between January 2014 and December 2020. Demographic, clinical, operative, and outcome data were collected, with additional radiographic data collected on patients chosen as case illustrations. Results Sixty-seven patients were identified who met the criteria for this study. The patients experienced a wide array of preoperative diagnoses, with Chiari malformation, AAI, CCI, and tethered cord syndrome representing the majority. The patients underwent a heterogeneous group of operations with the majority including a combination of the following procedures- suboccipital craniectomy, occipitocervical fusion, cervical fusion, odontoidectomy, and tethered cord release. The vast majority of patients experienced subjective symptomatic relief from their series of procedures. Conclusions EDS patients are prone to instability, especially in the occipital-cervical region, which may predispose these patients to require a higher rate of revision procedures and may require modifications in neurosurgical management that should be further explored.
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Affiliation(s)
- Mitchell B. Rock
- Department of Neurosurgery, Georgetown University School of Medicine, Washington, DC, USA
| | - David Y. Zhao
- Department of Neurosurgery, MedStar Georgetown University Hospital, Washington, DC, USA
| | - Daniel R. Felbaum
- Department of Neurosurgery, MedStar Georgetown University Hospital, Washington, DC, USA
- Department of Neurosurgery, MedStar Washington Hospital Center, Washington, DC, USA
| | - Faheem A. Sandhu
- Department of Neurosurgery, Georgetown University School of Medicine, Washington, DC, USA
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Marathe N, Lohkamp LN, Fehlings MG. Spinal manifestations of Ehlers-Danlos syndrome: a scoping review. J Neurosurg Spine 2022; 37:783-793. [PMID: 35986728 DOI: 10.3171/2022.6.spine211011] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 06/17/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Since its initial description, the definition of Ehlers-Danlos syndrome (EDS) has notably changed. At present, it broadly refers to disorders of the connective tissue that are heritable and have similar features including joint hypermobility, dermal dysplasia, and vascular as well as internal organ fragility. There has been no comprehensive review of spinal manifestations of EDS in the recent literature. That has led to controversies in management protocols of this so-called orphan disease. METHODS The authors used the latest version of the EDS classification from 2017, in which 13 subtypes were recognized. EDS has 19 different causal genes, mainly associated with collagen synthesis. Of these, 5 subtypes have associated spinal manifestations. RESULTS Some of the spinal pathologies associated with EDS include Chiari malformation, craniocervical instability, kyphoscoliosis, segmental instability and kyphosis, spontaneous CSF leaks, Tarlov cyst syndrome, tethered cord, and problems associated with wound healing. Here, the authors briefly discuss the demographics, etiology, pathophysiology, clinical features, management strategies, and directions for further research for each of these manifestations. CONCLUSIONS EDS belongs to the group of orphan diseases, with the total patient population being below 200,000. Further research on spinal manifestations of EDS is the need of the hour to establish clinical practice guidelines and close the significant knowledge gaps that currently exist.
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Affiliation(s)
- Nandan Marathe
- 1Division of Neurosurgery, Department of Surgery, University of Toronto, Ontario; and
| | - Laura-Nanna Lohkamp
- 1Division of Neurosurgery, Department of Surgery, University of Toronto, Ontario; and
| | - Michael G Fehlings
- 1Division of Neurosurgery, Department of Surgery, University of Toronto, Ontario; and.,2Division of Neurosurgery, Krembil Neuroscience Centre, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
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Mao G, Kopparapu S, Jin Y, Davidar AD, Hersh AM, Weber-Levine C, Theodore N. Craniocervical instability in patients with Ehlers-Danlos syndrome: controversies in diagnosis and management. Spine J 2022; 22:1944-1952. [PMID: 36028216 DOI: 10.1016/j.spinee.2022.08.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 08/02/2022] [Accepted: 08/17/2022] [Indexed: 02/03/2023]
Abstract
Ehlers-Danlos syndrome (EDS) is a rare hereditary condition that can result in ligamentous laxity and hypermobility of the cervical spine. A subset of patients can develop clinical instability of the craniocervical junction associated with pain and neurological dysfunction, potentially warranting treatment with occipitocervical fixation (OCF). Surgical decision-making in patients with EDS can be complicated by difficulty distinguishing from hypermobility inherent in the disease and true pathological instability necessitating intervention. Here we comprehensively review the available medical literature to critically appraise the evidence behind various proposed definitions of instability in the EDS population, and summarize the available outcomes data after OCF. Several radiographic parameters have been used, including the clivo-axial angle, basion-axial interval, and pB-C2 measurement. Despite increasing recognition of EDS by spine surgeons, there remains a paucity of data supporting proposed radiographic parameters for spinal instability among EDS patients. Furthermore, there is a lack of high-quality evidence concerning the efficacy of surgical treatments for chronic debilitating pain prevalent in this population. More standardized clinical measures and rigorous study methodologies are needed to elucidate the role of surgical intervention in this complex patient population.
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Affiliation(s)
- Gordon Mao
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA
| | - Srujan Kopparapu
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA
| | - Yike Jin
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA
| | - A Daniel Davidar
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA
| | - Andrew M Hersh
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA
| | - Carly Weber-Levine
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA
| | - Nicholas Theodore
- Department of Neurosurgery, Johns Hopkins University School of Medicine, , 600 N. Wolfe St., Meyer 7-113, Baltimore, MD 21287, USA.
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Lohkamp LN, Marathe N, Fehlings MG. Craniocervical Instability in Ehlers-Danlos Syndrome-A Systematic Review of Diagnostic and Surgical Treatment Criteria. Global Spine J 2022; 12:1862-1871. [PMID: 35195459 PMCID: PMC9609512 DOI: 10.1177/21925682211068520] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
STUDY DESIGN Systematic review. OBJECTIVE Ehlers-Danlos Syndrome (EDS) comprises a spectrum of connective tissue disorders, which may be associated with cranio-cervical instability (CCI). There is a lack of consensus on diagnostic imaging parameters, indications, and outcomes of surgical treatment. METHODS This systematic review analyses the literature on diagnostic methods and/or criteria for CCI, screening the databases Ovid Medline, Embase, Cochrane Library, and PubMed. Articles were included based on the PRISMA guidelines and assessed using the Newcastle-Ottawa Quality Assessment Scale (NOS) and according to their evidence level. RESULTS Sixteen articles, including 78 surgical patients, met the inclusion criteria. The main diagnostic measures for CCI were dynamic x-rays and CT imaging. Ten different radiographic parameters were reported, of which 4 were the most frequently applied for surgical decision-making: the clivo-axial angle (CXA), the Harris measurement, the Grabb-Mapstone-Oakes measurement, and the angular displacement of C1 to C2. The evidence level ranged between III and V and the article quality between 4 and 8 out of 9 stars on the NOS Scale. CONCLUSIONS There is a lack of high quality, prospective evidence regarding the evaluation of suspected CCI in patients with EDS. Based on our systematic review, we recommend that the CXA, Harris measurement, Grabb-Mapstone-Oakes measurement, and the angular displacement of C1 to C2 be used to evaluate suspected CCI in EDS patients. Surgical fixation of suspected CCI should only be performed in cases with clear radiographic presence of instability and concordant symptoms/signs. Consensus-based guidelines and care pathways are required.
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Affiliation(s)
- Laura-Nanna Lohkamp
- Division of Neurosurgery,
Department of Surgery, University of Toronto, Toronto, ON, Canada,Division of Neurosurgery, Spinal
Program, Krembil Nuroscience Centre, Toronto Western Hospital, University Health
Network, Toronto, ON, Canada
| | - Nandan Marathe
- Division of Neurosurgery,
Department of Surgery, University of Toronto, Toronto, ON, Canada,Division of Neurosurgery, Spinal
Program, Krembil Nuroscience Centre, Toronto Western Hospital, University Health
Network, Toronto, ON, Canada
| | - Michael G. Fehlings
- Division of Neurosurgery,
Department of Surgery, University of Toronto, Toronto, ON, Canada,Division of Neurosurgery, Spinal
Program, Krembil Nuroscience Centre, Toronto Western Hospital, University Health
Network, Toronto, ON, Canada,Michael G. Fehlings MD PhD, Division of
Neurosurgery and Spinal Program, Department of Surgery, University of Toronto,
Krembil Neuroscience Centre Toronto Western Hospital, 399 Bathurst Street, Suite
4W-449 Toronto, ON M5T 2S8, Canada.
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