Division of Veterinary Surgery, Department of Veterinary Science, Faculty of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan.
The Biomechanics Laboratory, Faculty of System Design, Tokyo Metropolitan University, Asahigaoka, Hino-shi, Tokyo, Japan.
Vet Comp Orthop Traumatol. 2020 Sep;33(5):301-307. doi: 10.1055/s-0040-1709505. Epub 2020 Apr 13.
The aim of the study was to determine the changes in biomechanical characteristics following tibial plateau levelling osteotomy (TPLO) using simulated manual tests.
Twenty-one stifles from healthy Beagle dogs that had undergone TPLO or had not (control) were first tested in the intact form, and then the cranial cruciate ligament (CrCL) was transected in each to provide four test situations: control-intact, control-CrCL-transected, TPLO-intact and TPLO-CrCL-transected. The stifles were then analysed using a robotic joint biomechanical testing system. The craniocaudal drawer, axial rotation and proximal compression tests were applied.
The craniocaudal displacement during the drawer test was not significantly different between the control-intact and TPLO-intact. However, the displacement was significantly greater in the TPLO-CrCL-transected than in the control-intact. In the axial rotation test, the internal-external (IE) rotation was significantly greater in the TPLO-intact than in the control-intact. Similarly, the IE rotation was significantly greater in the TPLO-CrCL-transected than in the control-CrCL-transected. In the proximal compression test, craniocaudal displacement was not significantly different among the control-intact, TPLO-intact and TPLO-CrCL-transected.
These findings suggest that TPLO influences the tension of the collateral ligaments and might generate laxity of the tibiofemoral joint. Instability after the osteotomy might be associated with the progression of osteoarthritis.
本研究旨在通过模拟手动测试，确定胫骨平台水平截骨术（TPLO）后生物力学特性的变化。
21 个来自健康比格犬的膝关节，其中 11 个进行了 TPLO，另外 10 个未进行（对照组），首先在完整状态下进行测试，然后在每个膝关节中切断前十字韧带（CrCL），以提供四种测试情况：对照组完整、对照组 CrCL 切断、TPLO 完整和 TPLO-CrCL 切断。然后使用机器人关节生物力学测试系统对膝关节进行分析。进行了距骨后抽屉、轴向旋转和近端压缩测试。
在抽屉试验中，对照组完整和 TPLO 完整时，距骨后抽屉位移没有显著差异。然而，在 TPLO-CrCL 切断时，位移明显大于对照组完整时。在轴向旋转试验中，TPLO 完整时的内-外（IE）旋转明显大于对照组完整时。同样，在 TPLO-CrCL 切断时，IE 旋转明显大于对照组 CrCL 切断时。在近端压缩试验中，对照组完整、TPLO 完整和 TPLO-CrCL 切断时，距骨后抽屉位移没有显著差异。
这些发现表明，TPLO 影响了侧副韧带的张力，可能导致了胫股关节的松弛。手术后的不稳定可能与骨关节炎的进展有关。
