Choate Christina J, Lewis Daniel D, Conrad Bryan P, Horodyski Mary Beth, Pozzi Antonio
Comparative Orthopaedics Biomechanics Laboratory, University of Florida, Gainesville, FL.
Vet Surg. 2013 Oct;42(7):853-9. doi: 10.1111/j.1532-950X.2013.12049.x. Epub 2013 Aug 29.
To (1) compare the effect of cyclic loading on craniocaudal tibial translation in cranial cruciate ligament (CrCL)-deficient stifles after extracapsular stabilization, and (2) evaluate the effect of peak force during cyclic loading on the rate of development of craniocaudal laxity.
Biomechanical cadaveric study.
Cadaveric pelvic limbs (n = 24 pairs) from skeletally mature dogs.
Twenty-four pairs of stifles were randomly assigned to 4 stabilization groups: nylon leader lateral circumfabellar-tibial suture (NLS); FiberTape lateral circumfabellar-tibial suture (FTLS); TightRope (TR); or bone anchor (BA). Contralateral limbs were cyclically loaded to produce cranial tibial translation at peak forces of either 80 or 160 N. Craniocaudal displacement of the tibia was measured with a mechanical testing machine during cyclic loading with the CrCL intact, after CrCL transection, and after extracapsular stabilization. The number of cycles each construct underwent before reaching 200% and 300% of the mean craniocaudal displacement present during cyclic loading of the CrCL-intact stifles was calculated. Number of cycles among treatment groups was compared with a Kruskal-Wallis test. P < .05 was considered significant.
Mean ± SD translation before and after CrCL transection were 3.9 ± 0.6 and 14.6 ± 1.7 mm, respectively. TR constructs resisted significantly more cycles than NLS constructs before reaching 7.8 mm (200%) and 11.7 mm (300%) of translation when loaded to 80 N. No other differences between constructs were significant at a peak load of 80 N. All constructs reached 7.8 and 11.7 mm of translation in fewer cycles when loaded to 160 N than at 80 N.
TR constructs were most resistant to elongation during cyclic loading. Doubling the peak force during cyclic loading significantly decreased the number of cycles constructs withstood, supporting recommendations for restricting postoperative activity after extracapsular stabilization of the CrCL-deficient stifle.
（1）比较关节囊外稳定术后，循环加载对颅后十字韧带（CrCL）缺失的 stifle 中胫骨干骺端前后移位的影响，以及（2）评估循环加载过程中的峰值力对胫骨干骺端松弛发展速率的影响。
生物力学尸体研究。
骨骼成熟犬的尸体骨盆肢体（n = 24 对）。
将 24 对 stifle 随机分为 4 个稳定组：尼龙引导外侧环腓骨 - 胫骨缝合（NLS）；纤维带外侧环腓骨 - 胫骨缝合（FTLS）；TightRope（TR）；或骨锚（BA）。对侧肢体进行循环加载，以 80 或 160 N 的峰值力产生胫骨前移位。在 CrCL 完整、CrCL 横断后以及关节囊外稳定后，使用机械测试机在循环加载过程中测量胫骨的前后移位。计算每个结构在达到 CrCL 完整的 stifle 循环加载期间出现的平均前后移位的 200%和 300%之前所经历的循环次数。治疗组之间的循环次数通过 Kruskal - Wallis 检验进行比较。P <.05 被认为具有统计学意义。
CrCL 横断前后的平均±标准差移位分别为 3.9±0.6 和 14.6±[此处原文可能有误，推测应为 1.7]1.7 mm。当加载至 80 N 时，在达到 7.8 mm（200%）和 11.7 mm（300%）的移位之前，TR 结构比 NLS 结构抵抗的循环次数显著更多。在峰值载荷为 80 N 时，各结构之间的其他差异均无统计学意义。当加载至 160 N 时，所有结构达到 7.8 和 11.7 mm 移位的循环次数均比加载至 80 N 时少。
TR 结构在循环加载过程中对伸长的抵抗力最强。循环加载过程中峰值力加倍显著减少了结构承受的循环次数，支持了对 CrCL 缺失 stifle 关节囊外稳定术后限制术后活动的建议。
