A Protocol to Evaluate Semi-Rigid Pedicle Screw Systems

[+] Author and Article Information
J. D. Clausen, V. K. Goel, M. Pfeiffer

Iowa Spine Research Center, Departments of Biomedical Engineering and Orthopædics, University of Iowa, Iowa City, IA 52242

K. Sairyo

Orthopeadische Universitaetsklinik, Baldingerstrasse, D-35032 Marburg, Federal Republic of Germany

J Biomech Eng 119(3), 364-366 (Aug 01, 1997) (3 pages) doi:10.1115/1.2796102 History: Received April 18, 1996; Revised January 14, 1997; Online October 30, 2007


The objective of the current study was to develop an in vitro testing protocol to evaluate semi-rigid pedicle screw devices. A corpectomy model protocol exists to evaluate rigid spinal implants; however, semi-rigid devices are contraindicated for this condition. This paper describes a technique that simulates more closely the conditions a semi-rigid device would see in vivo. Finally, the new testing protocol is used to evaluate the DDS® pedicle screw-cable system. Benefits and shortcomings of the new protocol are discussed.

Copyright © 1997 by The American Society of Mechanical Engineers
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