Department of Veterinary Clinical Sciences, University of Copenhagen, Dyrlaegevej 16, Frederiksberg C, 1870, Denmark.
Current address: College of Veterinary Medicine, University of Florida, 2015 SW 16th Ave, Gainesville, FL, 32608, USA.
Vet Res Commun. 2024 Jun;48(3):1845-1851. doi: 10.1007/s11259-024-10314-2. Epub 2024 Jan 29.
Cranial cruciate ligament rupture is a common cause of femorotibial instability in dogs. Despite numerous techniques being described for achieving joint stabilization, no consensus exists on the optimal management strategy. This ex vivo study utilized the path of the instantaneous center of rotation (ICR) to compare normal, pathological and treated joints. Fluoroscopic recordings of seven limbs from a previous study of canine stifle joint stability following center of rotation of angulation-based levelling osteotomy (CBLO) with and without hamstring loading were analyzed using least-squares approximation of the ICR and estimation of percentage gliding (vs. rolling) to determine if alterations in ICR path and gliding caused by CCL transection and following meniscal release could be normalized by CBLO. In intact joints, the ICR path was located mid-condyle, but this shifted significantly proximally and caudally following CCL transection and medial meniscal release (p < 0.007, p < 0.04). Hamstring loading resulted in qualitative and some quantitative improvements in joint movement based on percentage gliding movement analysis. The ICR path after CBLO remained significantly different to the intact location with or without a hamstring load (p < 0.02, p < 0.04), potentially consistent with CBLO aims of mild residual instability. CBLO resulted in percentage gliding characteristics not significantly different to intact joints (p > 0.08). Qualitative improvements in ICR path and percentage gliding quantities and variability suggest that hamstring loading positively influences joint biomechanics and that further investigation of this role ex vivo and clinically is warranted.
十字韧带断裂是犬后肢股胫关节不稳定的常见原因。尽管有许多技术被描述用于实现关节稳定，但对于最佳的管理策略还没有共识。本体外研究利用瞬时旋转中心（ICR）的路径来比较正常、病理和治疗关节。利用以前关于基于旋转中心的角度校正截骨术（CBLO）后犬膝关节稳定性的研究中的 7 条肢体的荧光透视记录，分析了 ICR 的最小二乘逼近和估计滑动百分比（与滚动相比），以确定 ICR 路径的变化和由于前十字韧带切断和半月板释放引起的滑动是否可以通过 CBLO 正常化。在完整的关节中，ICR 路径位于中髁，但在前十字韧带切断和内侧半月板释放后，它明显向近侧和尾侧移位（p<0.007，p<0.04）。腘绳肌加载导致关节运动的定性和一些定量改善，基于滑动百分比运动分析。CBLO 后的 ICR 路径与有或没有腘绳肌负荷的完整位置仍然有显著差异（p<0.02，p<0.04），这可能与 CBLO 轻度残留不稳定的目标一致。CBLO 导致的滑动百分比特征与完整关节没有显著差异（p>0.08）。ICR 路径和滑动百分比的定性改善和可变性表明，腘绳肌加载对关节生物力学有积极影响，需要进一步在体外和临床中研究这种作用。
