Pain/swelling after basketball injury. MENISCI: We see no meniscal tear.ARTICULAR CARTILAGE AND BONE: There is edema within the anterolateral aspect of the distal femur suggesting transient patellar dislocation. There is extensive full thickness cartilage loss along the patella centrally, most severely affecting the inferior aspect of the patella, with fissuring and delamination of the adjacent articular cartilage. This has progressed compared to the prior study. There is edema of the underlying bone with mild depression of the articular surface. There is mild deformity of the inferior pole of the patella which may represent an old healed fracture. There is superficial fraying of the articular cartilage of the lateral facet of the femoral trochlea. There is also edema within the posterior aspect of the medial tibial plateau which may represent a contusion.LIGAMENTS: The collateral and cruciate ligaments are intact. EXTENSOR MECHANISM: The quadriceps and patellar tendons appear intact. Thickening of the medial retinaculum likely represents chronic injury with a likely chronic tear of the medial patellofemoral ligament at its attachment.ADDITIONAL
1. Large cartilage defect along the patella, progressed from the prior study, is likely post-traumatic in etiology related to prior transient patellar dislocations with mild underlying subchondral bone changes in the patella and edema in the lateral femur.2. Femoral trochlear dysplasia and lateralization of the tibial tuberosity as described above.3. Joint effusion with probable intra-articular loose bodies.