26-year-old male with recurrent dislocation of the patella. Evaluate for loose ligaments of the patella or internal derangement. MENISCI: There is linear signal abnormality which extends to the femoral articular surface within the posterior horn of the lateral meniscus which may reflect a small vertical tear. The anterior horn appears intact. There is linear increased signal abnormality within the blunted posterior horn of the medial meniscus which extends to the femoral articular surface consistent with a complex tear. The anterior horn appears intact.ARTICULAR CARTILAGE AND BONE: Note is made of full-thickness articular cartilage defects along the lateral aspect of the weightbearing portion of the medial femoral condyle. There are also full-thickness articular cartilage defects along the weightbearing surface of the lateral femoral condyle above the anterior horn of the meniscus with underlying subchondral signal abnormality. There is a suggestion of mild dysplasia of the medial facet of the femoral trochlea.LIGAMENTS: There is complete rupture of the ACL. There is a curvilinear focus of low signal intensity along the anterior aspect of the expected location of the ACL which may represent ligamentous fragments. The PCL appears intact. The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact. The Insall-Salvati ratio measures 1.5 consistent with patella alta. The medial retinaculum appears intact. ADDITIONAL
1. Complete rupture of the ACL.2. Tearing of the medial and lateral meniscus.3. Findings consistent with patellofemoral instability with a probable loose body within the joint space.4. Full-thickness articular cartilage defects as described above.