Small effusion. Laxity on Lachman. Evaluate ACL. MENISCI: The medial meniscus appears intact. There is mucoid degeneration of the root of the anterior horn of the lateral meniscus that is new when compared with the prior study additional increased signal intensity within the peripheral fibers of the anterior horn of the lateral meniscus extending to the femoral articular surface appears more extensive on the current study on the prior study, and may represent a partial-thickness longitudinal tear in the red zone. There is also undersurface shallow undersurface fraying/tearing of the posterior horn of the lateral meniscus. The body of the body of the lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is edema within the anterior aspect of the lateral femoral condyle and the inferomedial aspect of patella likely representing a recent transient lateral patellar dislocation. There is partial thickness degeneration of the articular cartilage of the patella, particularly along the median eminence, that appears to have progressed when compared with the prior study. The articular cartilage of the femoral trochlea appears relatively intact, but the trochlear groove itself appears shallow suggesting femoral trochlear dysplasia. There is a full-thickness cleft of the articular cartilage of the weightbearing surface of the lateral tibial plateau that appears similar to that seen on the prior study accounting for technical differences. The underlying marrow edema seen on the prior study has resolved. There is additional degeneration of the articular cartilage of the lateral tibial plateau beneath the posterior horn of the lateral meniscus. The articular cartilage of the medial compartment appears relatively intact.LIGAMENTS: The anterior cruciate ligament is intact. The posterior cruciate ligament is intact. The medial collateral ligament is intact, as is the lateral collateral ligament complex. There is edema along the medial retinacular structures including the medial patellofemoral ligament, the femoral attachment of which is poorly defined suggesting a tear. The patellar attachment of the medial retinacular structures is also poorly defined which may reflect additional tearing. The lateral retinacular structures appear normal. EXTENSOR MECHANISM: The quadriceps and patellar tendons appear normal. The tibial tuberosity to trochlear groove distances within normal limits. Insall-Salvati ratio is within normal limits.ADDITIONAL
1.Normal-appearing anterior cruciate ligament.2.Small to moderate-sized joint effusion.3.Imaging findings of recent transient patellar dislocation with injury to the medial supporting structures of the patella as described above.4.Progression of cartilage abnormalities as described above.5.Lateral meniscal degeneration/tearing as described above.