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Feasibility study on posterior laminar screw fixation techniques in the axis.
Yong Hu1, Xian-feng He, Yong-jie Gu
1Department of Orthopaedics, Ningbo 6th Hospital, Ningbo, China. huyong610@163.com
Summary
Posterior laminar screw fixation is feasible in Chinese adults, offering a reliable technique for C2 stabilization. This study provides key morphologic parameters for successful surgical application.
Area of Science:
- Orthopedic Surgery
- Spinal Anatomy
- Biomechanical Engineering
Background:
- Cervical spine injuries require stable fixation.
- Posterior C2 screw fixation is a common technique.
- Understanding axial laminar anatomy is crucial for screw placement.
Purpose of the Study:
- To determine morphologic parameters of Chinese adult axial laminas.
- To evaluate the feasibility of axial laminar screw placement.
- To introduce the axial laminar screw technique.
Main Methods:
- Measurement of 28 Chinese adult axial specimens.
- Utilized digital caliper and goniometer for precise measurements.
- Statistical analysis of laminar thickness, height, screw trajectory, and entry point distances.
Main Results:
- Average entry point distances to superior laminar margins: 5 mm (superior) and 9 mm (inferior).
- Axial lamina dimensions: 3.2 mm (superior), 6.7 mm (middle), 5.5 mm (inferior) thickness; 12.8 mm height.
- Average screw trajectory lengths: 26.2 mm (superior) and 25.5 mm (inferior).
Conclusions:
- Posterior laminar screw fixation is feasible and reliable in Chinese adults.
- The C2 laminar screw technique serves as a valuable adjunct to conventional C2 posterior screw fixation.
