Reason: locking of the left knee. R/o internal derangement History: locking; had fraying cartilage seen on earlier MRI MENISCI: The medial and lateral menisci appear intact.ARTICULAR CARTILAGE AND BONE: The lateral compartment articular cartilage appears intact. The medial compartment articular cartilage appears intact. There is superficial fraying of the articular cartilage of the lateral facet of the patella comparable to that seen on the prior study. The femoral trochlea appears shallow, superiorly, suggesting mild femoral trochlear dysplasia.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The assessment as there appears intact.ADDITIONAL
1. Mild superficial fraying of the articular cartilage of the lateral facet of the patella appearing similar to the prior study.2. Additional findings suggestive of mild patellofemoral instability as described above.