The knee joint is the largest and most frequently injured joint in the body, combining the tibiofemoral and patellofemoral articulations in a single synovial capsule. Its stability depends primarily on soft tissue restraints (cruciate and collateral ligaments, menisci, muscles) rather than bony architecture, making it inherently vulnerable to sports injuries. Total knee replacement for end-stage osteoarthritis is one of the most commonly performed elective surgical procedures.
The terrible triad of knee injury (ACL, MCL, and medial meniscus) from a valgus contact force is the classic combined knee ligament injury pattern described by O'Donoghue. Modern understanding recognises that lateral meniscus tears are actually more common than medial in acute ACL tears. Knee effusion from haemarthrosis after acute trauma indicates a significant intra-articular injury (ACL tear in 70 percent of cases).
Combined ACL, MCL, and meniscal injury from valgus contact producing acute haemarthrosis and multiligament instability requiring staged surgical management.
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