<prompt> A college football player repos knee pain along the medial joint line with intermittent locking and inability to fully extend the knee after a twisting injury to his right knee. He has a negative Lachman test and a positive McMurray test. What is the most likely diagnosisACL injuryPCL injuryBucket-handle medial meniscus tearLongitudinal veical lateral meniscus tear  <response>: The patient has a bucket-handle medial meniscus tear after an acute injury. Such tears are associated with knee locking and a block to full extension. These tears are more common in young patients, often associated with ACL tears, and are the most commonly missed meniscal tear on MRI. 