Li G, Most E, DeFrate L E, Suggs J F, Gill T J, Rubash H E
Orthopaedic Biomechanics Laboratory, Harvard Medical School, Massachusetts General Hospital and Beth Israel Deaconess Medical Center, Boston, MA, USA.
J Biomech. 2004 May;37(5):779-83. doi: 10.1016/j.jbiomech.2003.09.031.
Most biomechanical studies of the knee have focused on knee flexion angles between 0 degrees and 120 degrees. The posterior cruciate ligament (PCL) has been shown to constrain posterior laxity of the knee in this range of flexion. However, little is known about PCL function in higher flexion angles (greater than 120 degrees ). This in vitro study examined knee kinematics before and after cutting the PCL at high flexion under a posterior tibial load and various muscle loads. The results demonstrated that although the PCL plays an important role in constraining posterior tibial translation at low flexion angles, the PCL had little effect in constraining tibial translation at 150 degrees of flexion under the applied loads.
大多数关于膝关节的生物力学研究都集中在0度至120度的膝关节屈曲角度。在这个屈曲范围内，后交叉韧带（PCL）已被证明可限制膝关节的后向松弛。然而，对于PCL在更高屈曲角度（大于120度）时的功能知之甚少。这项体外研究在胫骨后负荷和各种肌肉负荷下，检测了在高屈曲状态下切断PCL前后的膝关节运动学。结果表明，尽管PCL在低屈曲角度时对限制胫骨后向平移起重要作用，但在所施加的负荷下，PCL在150度屈曲时对限制胫骨平移几乎没有作用。
