Gudehus Timm, Sod Gary A, Riggs Laura M, Mitchell Colin F, Martin George S
Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
Vet Surg. 2011 Apr;40(3):261-5. doi: 10.1111/j.1532-950X.2011.00817.x. Epub 2011 Mar 1.
To compare the mean number of cycles to failure under axial compression of equine proximal interphalangeal (PIP) joint arthrodesis constructs created by 2 parallel transarticular Acutrak Plus screws (AP-TS) or 2 parallel transarticular 5.5 mm cortical screws inserted in lag fashion (AO-TLS).
Paired in vitro biomechanical testing of 2 methods of stabilizing cadaveric adult equine forelimb PIP joints.
Cadaveric adult equine forelimbs (n=5 pairs).
For each forelimb pair, 1 PIP joint was stabilized with AP-TS and 1 with AP-TLS. The 5 construct pairs were tested for cyclic fatigue under axial compression. Mean number of cycles to failure for each fixation method were compared by a paired t-test within each group with statistical significance set at P<.05.
The mean number of cycles to failure under axial compression for AO-TLS fixation and AP-TS fixation were 57,723±8488 and 35,322±4698, respectively.
The AO-TLS was superior to the AP-TS in resisting cyclic fatigue under axial compression.
比较由2枚平行经关节Acutrak Plus螺钉（AP-TS）或2枚以拉力方式插入的平行经关节5.5 mm皮质骨螺钉（AO-TLS）构建的马近端指间（PIP）关节融合结构在轴向压缩下失效前的平均循环次数。
对稳定成年马尸体前肢PIP关节的两种方法进行配对体外生物力学测试。
成年马尸体前肢（n = 5对）。
对于每对前肢，1个PIP关节用AP-TS固定，另1个用AO-TLS固定。对这5组构建物进行轴向压缩下的循环疲劳测试。通过每组内的配对t检验比较每种固定方法失效前的平均循环次数，设定统计学显著性为P <.05。
AO-TLS固定和AP-TS固定在轴向压缩下失效前的平均循环次数分别为57,723±8488和35,322±4698。
在抵抗轴向压缩下的循环疲劳方面，AO-TLS优于AP-TS。
