马近端指间关节融合术技术的体外生物力学比较：轴向定位动力加压钢板与两枚以拉力方式插入的远轴跨关节皮质骨螺钉对比三枚以拉力方式插入的平行跨关节皮质骨螺钉。

An in vitro biomechanical comparison of equine proximal interphalangeal joint arthrodesis techniques: an axial positioned dynamic compression plate and two abaxial transarticular cortical screws inserted in lag fashion versus three parallel transarticular cortical screws inserted in lag fashion.

作者信息

Sod Gary A, Riggs Laura M, Mitchell Colin F, Hubert Jeremy D, Martin George S

机构信息

Equine Health Studies Program, Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.

出版信息

Vet Surg. 2010 Jan;39(1):83-90. doi: 10.1111/j.1532-950X.2009.00615.x.

DOI:10.1111/j.1532-950X.2009.00615.x

PMID:20210950

Abstract

OBJECTIVES

To compare in vitro monotonic biomechanical properties of an axial 3-hole, 4.5 mm narrow dynamic compression plate (DCP) using 5.5 mm cortical screws in conjunction with 2 abaxial transarticular 5.5 mm cortical screws inserted in lag fashion (DCP-TLS) with 3 parallel transarticular 5.5 mm cortical screws inserted in lag fashion (3-TLS) for the equine proximal interphalangeal (PIP) joint arthrodesis.

STUDY DESIGN

Paired in vitro biomechanical testing of 2 methods of stabilizing cadaveric adult equine forelimb PIP joints.

SAMPLE POPULATION

Cadaveric adult equine forelimbs (n=15 pairs).

METHODS

For each forelimb pair, 1 PIP joint was stabilized with an axial 3-hole narrow DCP (4.5 mm) using 5.5 mm cortical screws in conjunction with 2 abaxial transarticular 5.5 mm cortical screws inserted in lag fashion and 1 with 3 parallel transarticular 5.5 mm cortical screws inserted in lag fashion. Five matching pairs of constructs were tested in single cycle to failure under axial compression, 5 construct pairs were tested for cyclic fatigue under axial compression, and 5 construct pairs were tested in single cycle to failure under torsional loading. Mean values for each fixation method were compared using a paired t-test within each group with statistical significance set at P<.05.

RESULTS

Mean yield load, yield stiffness, and failure load under axial compression and torsion, single cycle to failure, of the DCP-TLS fixation were significantly greater than those of the 3-TLS fixation. Mean cycles to failure in axial compression of the DCP-TLS fixation was significantly greater than that of the 3-TLS fixation.

CONCLUSION

The DCP-TLS was superior to the 3-TLS in resisting the static overload forces and in resisting cyclic fatigue.

CLINICAL RELEVANCE

The results of this in vitro study may provide information to aid in the selection of a treatment modality for arthrodesis of the equine PIP joint.

摘要

目的

比较轴向三孔、4.5毫米窄动力加压钢板（DCP）结合两枚以拉力方式植入的5.5毫米皮质骨螺钉，以及三枚以拉力方式平行植入的5.5毫米皮质骨螺钉（3-TLS），用于马近端指间关节（PIP）融合时的体外单调生物力学性能。

研究设计

对两种稳定成年马尸体前肢PIP关节方法进行配对体外生物力学测试。

样本群体

成年马尸体前肢（n = 15对）。

方法

对于每对前肢，一个PIP关节用轴向三孔窄DCP（4.5毫米）结合两枚以拉力方式植入的5.5毫米皮质骨螺钉进行固定，另一个用三枚以拉力方式平行植入的5.5毫米皮质骨螺钉进行固定。五对匹配的固定结构在轴向压缩下单次循环至失效进行测试，五对结构在轴向压缩下进行循环疲劳测试，五对结构在扭转载荷下单次循环至失效进行测试。每组内使用配对t检验比较每种固定方法的平均值，统计学显著性设定为P <.05。