In briefMedial collateral ligament and brief lateral collateral ligament (LCL) tears are common sequelae of varus or valgus knee injuries. Assessment, focusing on the physical exam, requires a high degree of suspicion for associated cruciate ligament, meniscus, and posterolateral or posteromedial corner injuries. Nonoperative treatment consisting of RICE, pain modalities, activity modification, and protection with a hinged brace is standard for most injuries. Grade 3 LCL tears usually require surgery. Functional rehabilitation begins immediately. Return to play is generally allowed when the player has regained 90% of usual strength.