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Dynamic cervical plates: biomechanical evaluation of load sharing and stiffness

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@ University of Utah

Dailey, Andrew T Brodke, Darrel S Gollogly, Sohrab Mohr, R. Alexander Nguyen, Bao-Khang Bachus, Kent N

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Journal ArticleStudy Design. An in vitro biomechanical study using a simulated cervical corpectomy model to compare the load-sharing properties and stiffnesses of two static and two dynamic cervical plates. Objectives. To evaluate the load-sharing properties of the instrumentation with a full-length graft and with 10% graft subsidence and to measure the stiffness of the instrumentation systems about the axes of flexion-extension, lateral bending, and axial torsion under these same conditions. Summary of Background Data. No published reports comparing conventional and dynamic cervical plates exist. Methods. Six specimens of each of the four plate types were mounted on ultra-high molecular weight polyethylene-simulated vertebral bodies. A custom four-axis spine simulator applied pure flexion-extension, lateral bending, and axial torsion moments under a constant 50 Naxial compressive load. Load sharing was calculated through a range of applied axial loads up to 120 N. The stiffness of each co
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School of MedicineNeurosurgery
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(c) Wolters Kluwer (LWW) http://lww.com
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University of Utah

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Mountain West Digital Library