21-year-old female with a history of lupus and knee avascular necrosis. Fell down stairs on 9/15/2015 now with pain, swelling and limited mobility. MENISCI: Note is made of a discoid lateral meniscus. No definite increased signal abnormality is identified within the meniscus to suggest a tear. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is deformity of the weightbearing surface of the lateral femoral condyle. There are multiple ossicles identified along the lateral aspect and weight bearing surface of the lateral femoral condyle likely representing osteochondral defect/loose bodies within the joint space. The largest measures 2.3 cm in the AP dimension (image 7; series 8). There are multiple additional fragments along the weightbearing surface of the medial aspect of the lateral femoral condyle which also likely represent osteochondral fragments which are surrounded by fluid signal intensity measuring up to 15 mm in AP dimension (image 11; series 9). There is increased signal abnormality within the lateral femoral condyle and posterior aspect of the lateral tibial plateau.There is partial-thickness articular cartilage degeneration along the medial facet of the femoral trochlea. There is subjective thickening of the articular cartilage along the medial facet of the patella. The articular cartilage along the medial tibiofemoral compartment appears relatively spared.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Multiple osteochondral fragments/loose bodies along the lateral aspect and weightbearing surface of the lateral femoral condyle as described above. There is also deformity of the weightbearing surface of the lateral femoral condyle which presumably represents the sequela of the patient's stated history of avascular necrosis.2. Discoid lateral meniscus without convincing evidence of a meniscal tear.