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Role of mechanical factors in the evaluation of pedicle screw type spinal fixation devices Goel VK, Ebraheim NA, Biyani A, Rengachary S, Faizan A Abstract Prior to implantation, spinal implants are subjected to rigorous testing to ensure safety and efficacy. A full battery of tests for the devices may include many steps ranging from biocompatibility tests to in vivo animal studies. This paper describes some of the essential tests from a mechanical engineering perspective (e.g., motion, load sharing, bench type tests, and finite element model analyses). These protocols reflect the research experience of the past decade or so. Keywords Instrumentation, biomechanics, pull out strength, stability

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