Lee-Shee N K, Dickey J P, Hurtig M B
Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.
Vet Comp Orthop Traumatol. 2007;20(1):70-2.
Ovine stifle joint contact pressures and contact areas were measured in vitro using a six degree-of-freedom (DOF) robotic system. The robot generated static joint loads of 1.875 times body weight (BW) compression, 0.15 BW medial shear and 0.625 BW cranial shear at 6.5 degrees of flexion for four specimens, simulating the early stance phase of gait (walking). This condition represents a period of intense loading and was implemented as a worst-case loading scenario for the joint at this gait. We determined that the medial and lateral compartments bore 5.5 +/- 0.9 MPa and 4.4 +/- 1.1 MPa of mean pressure, respectively, on 107.7 +/- 28.7 mm(2) and 60.8 +/- 56.3 mm(2) of area, respectively. The unique contribution of this study is that stifle contact pressures and areas were determined during loading which simulated physiological levels (early stance phase of gait). This information is important to our understanding of the stresses that must be borne by repair tissues/constructs that are implanted into human and animal tibio-femoral joints.
使用六自由度（DOF）机器人系统在体外测量绵羊膝关节的接触压力和接触面积。对于四个样本，机器人在6.5度屈曲时产生相当于体重（BW）1.875倍的静态关节压缩载荷、0.15 BW的内侧剪切力和0.625 BW的前侧剪切力，模拟步态（行走）的早期站立阶段。这种情况代表了一个高强度加载时期，并被设定为该步态下关节的最坏情况加载场景。我们确定内侧和外侧关节腔分别承受平均压力5.5±0.9兆帕和4.4±1.1兆帕，接触面积分别为107.7±28.7平方毫米和60.8±56.3平方毫米。本研究的独特贡献在于，在模拟生理水平（步态早期站立阶段）的加载过程中确定了膝关节的接触压力和面积。这些信息对于我们理解植入人和动物胫股关节的修复组织/结构必须承受的应力非常重要。
