medial collateral ligament
Also written as: MCL — Medial Collateral Ligament
Primary stabilizing ligament on the inner side of the knee that prevents excessive inward angulation.
Full Definition
A broad, flat ligament complex on the medial aspect of the knee consisting of superficial and deep layers that provide primary restraint against valgus stress and external rotation. The MCL originates from the medial femoral epicondyle and inserts on the proximal tibia, with the deep fibers attached to the joint capsule and medial meniscus. MCL injuries commonly occur in contact sports through valgus loading mechanisms, often in combination with ACL and meniscal tears (the "unhappy triad"). Unlike other knee ligaments, the MCL has excellent healing potential due to its rich blood supply.
Usage
Usage note: Commonly abbreviated as MCL; specify grade of injury and associated pathology in documentation.
In Context
- "MRI revealed a complete medial collateral ligament tear with associated bone marrow edema." — Radiology report
- "The football player's medial collateral ligament injury healed conservatively without surgical intervention." — Follow-up note