Faculty of Veterinary Medicine, Division of Veterinary Surgery, Department of Veterinary Science, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan.
Biomechanics Laboratory, Faculty of System Design, Tokyo Metropolitan University, Hachioji-shi, Tokyo, Japan.
Vet Med Sci. 2022 Sep;8(5):1904-1914. doi: 10.1002/vms3.889. Epub 2022 Aug 10.
Tibial plateau levelling osteotomy (TPLO) changes the anatomical tibial conformation and might alter the positional relationship of the ligaments comprising the stifle joint. As a result, it is expected to affect the tensile force of the ligaments. However, studies analyzing the details of the effect of osteotomy are limited.
To evaluate the influence of TPLO on the tensile force on the stifle ligaments in the intact canine stifle using a six-degree-of-freedom (6-DOF) robotic testing system.
Eight stifles were categorised into the reference group and nine stifles into the TPLO group. The stifles were then analysed using a 6-DOF robotic joint biomechanical testing system. The stifles were applied 30 N at cranial, caudal, and compression loads and 1 Nm at the internal and external torque loads (the load applied to the tibia relative to the femur) on extension, at 135° and 120°, respectively. The tensile force placed on the cranial cruciate ligament (CrCL), the caudal cruciate ligament, the medial collateral ligament, lateral collateral ligament and the total tensile force placed on the four ligaments was calculated under each load.
For the caudal load applied to the tibia relative to the femur, the CrCL tensile force in the TPLO group was lower than that in the reference group at 120° (p = 0.02). The CrCL tensile force in the TPLO group was lower than that in the reference group at 120° (p < 0.01) for the compression load. Regarding the cranial, internal, and external load, the CrCL tensile force remains unchanged between both groups at each angle.
TPLO reduces CrCL tensile force during compression and caudal force application. TPLO may reduce tensile forces contributing to CrCL rupture.
胫骨平台平整截骨术（TPLO）改变了胫骨的解剖形态，可能改变了构成膝关节的韧带的位置关系。因此，预计会影响韧带的拉伸力。然而，分析截骨术细节影响的研究有限。
使用六自由度（6-DOF）机器人测试系统评估 TPLO 对完整犬膝关节韧带拉伸力的影响。
将 8 个膝关节分为对照组和 9 个 TPLO 组。然后使用 6-DOF 机器人关节生物力学测试系统对膝关节进行分析。在伸展时，膝关节分别施加 30 N 的额状、尾状和压缩载荷以及 1 Nm 的内、外扭矩载荷（相对于股骨施加到胫骨上的载荷），分别为 135°和 120°。在每个载荷下，计算前交叉韧带（CrCL）、后交叉韧带、内侧副韧带、外侧副韧带和四条韧带的总拉伸力所施加的拉伸力。
对于相对于股骨施加到胫骨的尾状载荷，在 120°时 TPLO 组的 CrCL 拉伸力低于对照组（p = 0.02）。在 120°时，TPLO 组的 CrCL 拉伸力低于对照组（p < 0.01）对于压缩载荷。对于额状、内、外载荷，在每个角度，两组之间的 CrCL 拉伸力保持不变。
TPLO 降低了压缩和尾状力应用时的 CrCL 拉伸力。TPLO 可能会降低导致 CrCL 断裂的拉伸力。
