Posterior cruciate ligament injury

Injury of posterior cruciate ligament of knee is caused by strong violence. Posterior cruciate ligament injury accounts for 3% to 20% of all knee ligament injuries. Among them, 30% were isolated injuries and 70% were combined with other ligament injuries. Because of the knee ligament structure, PCL is the most powerful. Biomechanical experiments have proven that the strength of PCL against external forces is equivalent to twice that of ACL. It is the main stable structure for knee flexion and extension and rotation, and is equivalent to the knee rotation axis. Therefore, PCL injury not only causes vertical instability of the joint, but also can cause knee rotation instability. The degree of loss of function after cruciate ligament injury can occur from hardly affecting lifestyles to severely restricted daily activities. Posterior cruciate ligament injury can lead to further relaxation of the knee's secondary stability factors, causing local pain, swelling and instability. It has been demonstrated that in the medial and patellofemoral space, the result of this injury is degenerative osteoarthritis. Clinically, proper treatment must be performed.

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