Ronsky J L, Herzog W, Brown T D, Pedersen D R, Grood E S, Butler D L
Department of Mechanical Engineering, University of Calgary, Alberta, Canada.
J Biomech. 1995 Aug;28(8):977-83. doi: 10.1016/0021-9290(94)00153-u.
A new method for in vivo measurement of patellofemoral joint contact areas, stresses, and patellar displacements, with joint loading approximating physiologic conditions was developed. Joint contact measurements were obtained using pressure sensitive film inserted directly between articular joint surfaces. Two-dimensional joint kinematics were measured using a high-speed video based motion analysis system. Joint loading, provided by quadriceps muscle stimulation, was measured with an implantable force transducer (IFT). Variations in joint mechanics as a function of joint flexion angle, joint loading and joint stability (anterior cruciate ligament intact or transected) were determined for four adult male cats. The contact measurements obtained with the pressure sensitive film displayed high repeatability with a standard error of +/- 6.8% of the mean value of the median pressure and +/- 4.4% of the mean contact area value. Substantial differences in joint mechanics were reliably detected with the new technique. The influence of experimental procedures, such as incisions in the joint capsule and insertion of pressure sensitive film between the articular surfaces, produced minimal changes in the joint kinematics during muscular contraction.
开发了一种新方法，用于在体内测量髌股关节的接触面积、应力和髌骨位移，且关节负荷接近生理条件。使用直接插入关节面之间的压敏膜获得关节接触测量值。使用基于高速视频的运动分析系统测量二维关节运动学。通过可植入力传感器（IFT）测量由股四头肌刺激提供的关节负荷。确定了四只成年雄性猫的关节力学随关节屈曲角度、关节负荷和关节稳定性（前交叉韧带完整或横断）的变化。用压敏膜获得的接触测量值显示出高重复性，中位压力平均值的标准误差为+/-6.8%，平均接触面积值的标准误差为+/-4.4%。新技术可靠地检测到了关节力学的显著差异。诸如关节囊切开和在关节面之间插入压敏膜等实验程序对肌肉收缩期间的关节运动学产生的变化极小。
