posterior cruciate ligament
Also written as: PCL — posterior cruciate ligament
The stronger of the two cruciate ligaments in the knee, primarily preventing posterior translation of the tibia relative to the femur.
Full Definition
The posterior cruciate ligament (PCL) is a robust intra-articular structure that serves as the primary restraint against posterior tibial translation. PCL injuries are less common than ACL injuries but occur frequently in contact sports, particularly football and soccer, often resulting from direct trauma to the anterior tibia with the knee flexed. Unlike ACL injuries, PCL tears may be less functionally limiting initially, leading to potential underdiagnosis. The ligament has better healing potential than the ACL due to its superior blood supply. Clinical diagnosis involves the posterior drawer test and posterior sag sign. Management ranges from conservative treatment with bracing and rehabilitation to surgical reconstruction, depending on the degree of injury and functional demands.
Usage
Usage note: Less dramatic presentation than ACL injuries; maintain high suspicion in dashboard-type mechanisms.
In Context
- "MRI demonstrated a complete tear of the posterior cruciate ligament with associated bone bruising." — Radiology report
- "The football player sustained a posterior cruciate ligament injury during a helmet-to-knee collision." — Injury report