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Posted on: 29 March, 2026

Source: Verywell Health

The medial collateral ligament (MCL) is an important structure that provides stability to the inside of your knee. Running from the thigh bone (the femur) to the lower leg bone (the tibia), this ligament prevents the knee from buckling inward into a knock-kneed (valgus) position.

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  • American Shoulder and Elbow Surgeons
  • Mid-Atlantic Shoulder and Elbow Society
  • American Orthopaedic Society for Sports Medicine
  • American Academy of Orthopaedic Surgeons
  • Indian American Shoulder and Elbow Surgeons