Multiaxial spine testing apparatus: system characterisation by evaluation of analogue and cadaveric lumbar spines
by Zachary A. Dooley; Alexander W.L. Turner; G. Bryan Corwall
International Journal of Experimental and Computational Biomechanics (IJECB), Vol. 2, No. 2, 2013

Abstract: A custom 6 degrees-of-freedom test system was developed to collect unconstrained pure-moment biomechanical data from excised multi-segmental human spines. In this study, two characterisation methods were utilised. First, a polyethylene analogue model was created to establish test system baseline performance. Second, 22 lumbar spines (L1-L5) were tested to understand system operation under actual usage accounting for specimen stiffness and coupled motions. Each lumbar spine was tested in the anatomical planes (flexion-extension, lateral bending, and axial rotation) under two different conditions (intact and after implantation with an interbody cage at L3-L4). Specimen range of motion, neutral zone, and force/torque component errors generated by the test system were similar to previously reported data. Pure-moments were repeatable throughout the experiment in both cadaveric conditions, indicated by consistency in range of motion and neutral zone at the non-index levels. This characterisation will assist with interpretation of experimental data generated by the test system.

Online publication date: Sat, 12-Jul-2014

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