Biomechanical Comparison of Lumbar Disc Prostheses: ProDisc-L, Charite, and Maverick Disc Implant Systems

摘要

The purpose of this study was to investigate the in vitro biomechanics of 3 total disc replacement devices: ProDisc-L (Synthes Spine, West Chester, PA), Maverick (Medtronic, Memphis, TN), and Charite (DePuy, Warsaw, IN). A total of 19 fresh human cadaveric spines (Ll-S) were prepared and tested in flexion-extension, lateral bending, and axial rotation to a target bending moment of 8 Nm. Five different spine conditions were tested: harvested (H) (n=19), L5-S lumbar disc replacement using ProDisc-L (n=13), Maverick (n=7), and Charite (n=6), and L5-S pedicle screw fixation (PSF) (n=19). Measurements included vertebral motions, total spine rotation, and applied loads. The percent contribution of rotation at the instrumented (L5-S) level relative to total rotation (Ll-S), as well as at the remaining adjacent levels relative to total rotation, was determined at a common load limit (8Nm) and compared using a one-way ANOVA and SNK test (P<0.05). Compared to pedicle screw fixation, all three disc prostheses remained stable and provided improved lumbar mobility.