Pain and instability. Check for meniscal injury and possible patellar tendon rupture MENISCI: The lateral meniscus appears intact, however marked destruction of the medial meniscus is observed throughout with only the posterior and anterior anchoring components moderately well preserved.ARTICULAR CARTILAGE AND BONE: Diffuse cartilaginous thinning is observed without discrete focal abnormality along articular surfaces. Mild degenerative changes, however please see subsequent description below concerning marrow signal and bone contusionsLIGAMENTS: Marked thinning and signal at valley throughout the MCL is also observed compatible with thinning as well as severe high-grade strain and partial tearing. The LCL appears grossly intact yet thinned.The ACL isn't intact, however the PCL demonstrates associated marked similar thinning and redundancy. Although fibers can be traced from origin to insertion, the appearance with abnormal draping around the ligament of Humphries is concerning for chronic change and injury. Correlation with physical exam would be helpful.EXTENSOR MECHANISM: Abnormally high riding patella with associated underlying contusion within the lateral femoral condyle. The underlying patellar tendon however appears elongated yet intact. Marked soft tissue stranding and changes are observed throughout the anterior knee with associated tearing of the retinaculum which is not visualized. Concern for acute or subacute rupture. Associated medial to lateral displacement is also observed of the patella without associated significant abnormality of the patellar body other than minimal to signal change in the patellar cartilage.ADDITIONAL
1. Patellar alta with associated underlying osseous changes yet grossly intact patellar tendon is observed. Retinacular tearing and associated additional acute and subacute changes described, along with an abnormal appearing PCL and MCL.2. Marked destruction of the medial meniscus.