MCL/LCL Sprain

Understanding MCL/LCL Sprain

Also known as: Medial Collateral Ligament Sprain, Lateral Collateral Ligament Sprain, Collateral Ligament Injury The medial collateral ligament (MCL) on the inside of the knee and the lateral collateral ligament (LCL) on the outside act as side-to-side stabilizers. A force that pushes the knee inward (valgus) can strain or tear the MCL; an outward force (varus) can injure the LCL. Sprains are graded I (mild stretch), II (partial tear), or III (complete tear). Isolated MCL injuries — especially grade I and II — heal remarkably well with structured conservative care, which is why surgery is rarely the first step.

Immediate pain on the inside or outside of the knee after a tackle, awkward landing, or cutting move, with possible instability, mild swelling, and pain on stress testing are typical. Contact sports, cutting and pivoting activities, and slips on uneven terrain are common culprits. We follow the modern PEACE & LOVE framework (Protection, Elevation, Avoid anti-inflammatories acutely, Compression, Education — then Load, Optimism, Vascularization, Exercise) that favors active recovery. We mobilize the knee to prevent stiffness, use Class IV laser to support healing, apply functional taping or bracing, and progress rehab from isometrics to closed-chain strengthening to sport-specific cutting and plyometrics.

Grade I typically heals in two to four weeks, grade II in four to eight. Grade III — particularly LCL tears — usually warrants orthopedic referral. We may recommend: mobilization, extremity adjustments, Class IV laser, kinesio taping, corrective exercise, PEMF, eccentric loading protocol Seek immediate care if: The knee feels grossly unstable, you cannot bear weight, or there is rapid significant swelling suggesting multi-ligament or combined injury.