Rohlmann A, Riley L H, Bergmann G, Graichen F
Biomechanics Laboratory, Orthopaedic Hospital, Free University of Berlin, Germany.
Med Eng Phys. 1996 Sep;18(6):485-8. doi: 10.1016/1350-4533(95)00087-9.
An AO spinal fixateur interne was modified to study the effects of a corpectomy on implant performance. A hermetically sealed cartridge containing strain gauges and an inductively powered telemetry unit was integrated into the threaded portion of the original implant. Five cadaveric spines were instrumented with the modified implant spanning a single lumbar vertebra. The spines were tested in axial compression, torsion, flexion, extension and lateral bending. Measurements of the three forces and moments within the implant were performed in the intact spine and repeated following a corpectomy and corpectomy plus complete posterior ligamentous injury. The bending moment, increased following corpectomy in all testing modes. The largest increase was in the flexion bending moment, which increased from 155 Nmm to 3328 Nmm following corpectomy.
对AO脊柱内固定器进行了改良，以研究椎体切除对植入物性能的影响。一个装有应变片和感应供电遥测单元的密封盒被集成到原始植入物的螺纹部分。五具尸体脊柱用改良后的植入物固定，跨越单个腰椎椎体。对脊柱进行轴向压缩、扭转、前屈、后伸和侧弯测试。在完整脊柱中测量植入物内的三种力和力矩，并在椎体切除以及椎体切除加完全后韧带损伤后重复测量。椎体切除后，所有测试模式下的弯矩均增加。最大的增加是在屈曲弯矩方面，椎体切除后从155 N·mm增加到3328 N·mm。
