Knee Sprains and Meniscal Injuries (Anterior Cruciate Ligament Tear; Meniscus Injury; Medial Collateral Ligament Tear; Posterior Cruciate Ligament Tear) By Danielle Campagne, MD, University of California, San Francisco Reviewed / Revised Mar 2021 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Fibroconnective Tissues of... Ligaments of the knee How To Apply a Knee Immobilizer Sprains of the external (medial and lateral collateral) or internal (anterior and posterior cruciate) ligaments or injuries of the menisci may result from knee trauma.