Arkansas Specialty Orthopaedics, Little Rock, AR 72205, USA.
J Arthroplasty. 2012 Sep;27(8):1460-1468.e1. doi: 10.1016/j.arth.2012.02.008.
A total knee has been designed to mimic less-compliant medial and more-compliant lateral behavior. In vivo testing compared open-kinematic chain behaviors of cadaver knees in their normal state and after implantation of the knee prosthesis. Specimen's limbs were computed tomography scanned, and infrared arrays on tibia and femur were registered to bone markers. Motion of the joint and quadriceps force were reported from 90° flexion to full extension. Less medial and more lateral anterior-posterior motion was seen in both the intact and the implanted knees. Tibiofemoral rotation and translation were similar in direction but were reduced in magnitude for the prosthetic knees. Quadriceps force, defined as that applied force required to extend the knee, required after implantation was variable between specimens but not statistically different from the intact condition. The prosthesis tested exhibits kinematic behavior similar to that in their normal state, with no difference in quadriceps force required for extension.
全膝关节的设计旨在模拟顺应性较低的内侧和顺应性较高的外侧行为。对尸体膝关节在正常状态和植入膝关节假体后的开链运动行为进行了体内测试。对标本的四肢进行了计算机断层扫描，并将胫骨和股骨上的红外阵列注册到骨标记物上。报告了从 90°弯曲到完全伸展的关节运动和股四头肌力。在完整的和植入的膝关节中，都可以看到较小的内侧和更大的外侧前后运动。胫骨股骨旋转和平移的方向相似，但对于假体膝关节，其幅度减小。股四头肌力定义为伸展膝关节所需的施加力，植入后所需的股四头肌力在标本之间是可变的，但与完整状态没有统计学差异。所测试的假体表现出与正常状态相似的运动行为，伸展所需的股四头肌力没有差异。
