MCL Sprain or Tear !
An MCL sprain is an injury to the medial collateral ligament on the inner knee, usually from a blow to the outer knee or a twisting fall.
Updated 2026-10-23
Structures involved
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Why it happens
What it is
Injury to the medial collateral ligament from a blow to the outer side of the knee or a twisting fall.
Classification
- Grade 1 (mild)
- Grade 2 (partial)
- Grade 3 (complete)
Symptoms and signs
- Pain on the inner side of the knee
- Pain or laxity with valgus stress
Diagnosis
- Clinical
- Valgus stress test
- Imaging
- MRI if severe or other injuries suspected
Treatment
- Rehabilitation
- Most heal without surgery: hinged brace, rest, and physical therapy.
- Surgical
- Surgery is uncommon and mainly used for severe combined ligament injuries.
Educational information, not medical advice. For any symptom, see a health professional.
Sources: Medial Collateral Ligament Knee Injury (StatPearls (NCBI Bookshelf), 2024).
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Representative model, for educational purposes only.
