Load transfer characteristics between posterior spinal implants and the lumbar spine under anterior shear loading: an in vitro investigation

Spine
Angela D MelnykThomas R Oxland

Abstract

A biomechanical human cadaveric study. To determine the percentage of shear force supported by posterior lumbar spinal devices of varying stiffnesses under anterior shear loading in a degenerative spondylolisthesis model. Clinical studies have demonstrated beneficial results of posterior arthrodesis for the treatment of degenerative spinal conditions with instability. Novel spinal implants are designed to correct and maintain spinal alignment, share load with the spine, and minimize adjacent level stresses. The optimal stiffness of these spinal systems is unknown. To our knowledge, low-stiffness posterior instrumentation has not been tested under an anterior shear force, a highly relevant force to be neutralized in the clinical case of degenerative spondylolisthesis. The effects of implant stiffness and specimen condition on implant load and intervertebral motion were assessed in a biomechanical study. Fifteen human cadaveric lumbar functional spinal units were tested under a static 300 N axial compression force and a cyclic anterior shear force (5-250 N). Implants (high-stiffness [HSI]: ø 5.5-mm titanium, medium-stiffness [MSI]: ø 6.35 × 7.2-mm oblong PEEK, and low-stiffness [LSI]: ø 5.5-mm round PEEK) instrumented with strain...Continue Reading

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Citations

Aug 12, 2014·Orthopaedics & Traumatology, Surgery & Research : OTSR·Y P CharlesW Skalli
Nov 25, 2014·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Angela D MelnykThomas R Oxland
Jan 7, 2015·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Angela D MelnykThomas R Oxland

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