Guerrero Tomás G, Pozzi Antonio, Dunbar Nicholas, Kipfer Nicolas, Haessig Michael, Beth Horodyski Mary, Montavon Pierre M
Clinic for Small Animal Surgery, Vetsuisse-Faculty University of Zurich, Zurich, Switzerland.
Vet Surg. 2011 Oct;40(7):839-48. doi: 10.1111/j.1532-950X.2011.00866.x. Epub 2011 Aug 16.
To evaluate the effect of tibial tuberosity advancement (TTA) on patellofemoral (PF) contact mechanics, and alignment of the PF and femorotibial (FT) joints in cranial cruciate ligament (CrCL)-deficient stifles of dogs.
Ex vivo biomechanical study.
Unpaired cadaveric hind limbs (n=9).
Digital pressure sensors placed in the PF joint were used to measure contact force, contact area, peak and mean contact pressure, and peak pressure location with the limb under an axial load of 30% body weight and a stifle angle of 135°. The FT and PF poses were obtained using a 2-dimensional computer digitization technique. Each specimen was tested under normal, CrCL-deficient, and TTA-treated conditions. Data was normalized and analyzed, after testing for normality by Wilk-Shapiro, using 1 sample T-test, paired T-test, and ANOVA; P≤.05 was considered significant. Bonferroni's correction was used when needed.
A significant cranioproximal tibial displacement and increase in patellar tilt were found in the CrCL-deficient joints. Both FT and PF alignments were restored after TTA. Contact areas and peak pressure did not vary between conditions. Peak pressure location displaced proximally from intact to CrCL-deficient condition and returned to normal after TTA. Total force measured in the CrCL-deficient stifle and TTA conditions were significantly lower than in the control.
TTA restored the normal FT and PF alignment, and reduced the retropatellar force by about 20%.
评估胫骨结节前移（TTA）对犬颅侧十字韧带（CrCL）缺失 stifle 关节中髌股（PF）接触力学以及 PF 和股胫（FT）关节对线的影响。
体外生物力学研究。
未配对的尸体后肢（n = 9）。
在 PF 关节中放置数字压力传感器，用于在 30%体重的轴向载荷和 135° stifle 角下测量肢体的接触力、接触面积、峰值和平均接触压力以及峰值压力位置。使用二维计算机数字化技术获取 FT 和 PF 位姿。每个标本在正常、CrCL 缺失和 TTA 治疗条件下进行测试。数据经 Wilk-Shapiro 检验正态性后进行归一化和分析，使用单样本 T 检验、配对 T 检验和方差分析；P≤0.05 被认为具有显著性。必要时使用 Bonferroni 校正。
在 CrCL 缺失的关节中发现胫骨明显向颅近端移位且髌骨倾斜增加。TTA 后 FT 和 PF 对线均恢复。不同条件下接触面积和峰值压力无变化。峰值压力位置从完整状态到 CrCL 缺失状态向近端移位，TTA 后恢复正常。在 CrCL 缺失的 stifle 和 TTA 条件下测量的总力显著低于对照组。
TTA 恢复了正常的 FT 和 PF 对线，并使髌后力降低了约 20%。
