26-year-old male with recurrent dislocation of the patella. Evaluate for loose ligaments of the patella or internal derangement. MENISCI: There is branching linear signal abnormality within the posterior horn of the medial meniscus which extends to the tibial and femoral articular surface consistent with a complex tear with both the vertical and horizontal component which extends into the body of the meniscus. The anterior horn appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is a near full-thickness articular cartilage fissure along the knee medial facet of the patella, centrally. There is also a near full-thickness to full-thickness articular cartilage fissure along the lateral facet of the femoral trochlea, centrally. There is increased signal abnormality within the medial aspect of the patella consistent with the stated history of transient patellar dislocation. The medial retinaculum appears intact. Findings suggestive of mild femoral trochlear dysplasia. There are medial and lateral compartment osteophytes.LIGAMENTS: There is complete rupture of the ACL. The PCL appears intact. The MCL and LCL appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact. The Insall-Salvati ratio is 1.5 consistent with patella alta. ADDITIONAL
1. Rupture of the ACL.2. Complex tear of the medial meniscus.3. Findings suggestive of patellofemoral instability as described above.4. Articular cartilage fissures as described above.