Feasibility of Sub-Axial Cervical Laminar Screws, Including C7, in the Indian Population: A Study on 50 Patients Using Computed Tomography-Based Morphometry Measurements

被引:5
作者
Srivastava, Abhishek [1 ]
Nanda, Geetanjali [2 ]
Mahajan, Rajat [3 ]
Nanda, Ankur [3 ]
Batra, Sahil [4 ]
Mishra, Nirajana
Pandita, Naveen [1 ]
Chhabra, Harvinder Singh [3 ]
机构
[1] Primus Hosp, Dept Spine Serv, New Delhi 110021, India
[2] Mahajan Imaging Ctr, Dept Radiodiag, New Delhi, India
[3] Indian Spinal Injuries Ctr, Dept Spine Serv, New Delhi, India
[4] Caremax Superspecial Hosp, Dept Spine Serv, Jalandhar, India
关键词
Indian; Cervical; Morphometry; Translaminar; Screws; TRANSLAMINAR SCREW; NONTRAUMATIC LESIONS; C2; FIXATION; SPINE; PEDICLE; COMPLICATIONS; PLACEMENT; MANAGEMENT;
D O I
10.31616/asj.2018.0110
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Study Design: Observational study of computed tomography (CT) data. Purpose: We performed a CT-based radiographic analysis of sub-axial cervical lamina in the Indian population to assess the feasibility of laminar screws. Overview of Literature: Morphometric studies have been performed for populations of various ethnic groups, but none exist for Indian populations. Methods: Cervical spine CT scans of 50 adults with a minimum slice thickness of <2 mm (0.5-2 mm) were obtained from the database of a single center in northern India. Measurements (e.g., length, thickness, and height) were taken in millimeters along the axial, coronal, and sagittal planes. Three measurements were made to assess laminar anatomy, namely, the translaminar/screw length, laminar thickness, and sagittal laminar height. Results: The final sample comprised 500 laminae in 50 patients, resulting in 1,500 measurements. The mean translaminar lengths of the C3, C4, C5, C6, and C7 laminae were 19.48 mm, 19.60 mm, 19.61 mm, 20.49 mm, and 22.85 mm, respectively. The mean thicknesses of these cervical laminae were 3.12 mm, 2.62 mm, 2.56 mm, 3.47 mm, and 5.20 mm, respectively. The mean sagittal heights of these laminae were 9.38 mm, 9.80 mm, 10.12 mm, 11.31 mm, and 13.84 mm, respectively. Except for the C7 vertebrae, all other levels had a success rate of <10% in the Indian population using the criteria of a laminar height of at least 9 mm and thickness of 4.5 mm. Limited success was achieved at the C5, C6, and C3 levels. Conclusions: To the best of our knowledge, the present study is the only series on the feasibility of laminar screws in the sub-axial cervical spine in the Indian population. We found that Indian patients have smaller anatomical dimensions and thus, are not suitable for laminar screws in the sub-axial cervical spine, barring C7, which is contrary to findings for populations in western and south Asian countries.
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页码:7 / 12
页数:6
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