Male, 42 years old. Reason: knee pain, locking. History: knee pain with sprain of lateral collateral ligament on left knee. MENISCI: The medial and lateral menisci appear intact.ARTICULAR CARTILAGE AND BONE: Markedly thinning and irregularity of the articular cartilage of the medial femoral condyle. The articular cartilage of the lateral femoral condyle is also thin. There is a partial-thickness cleft within the cartilage along the apex of the patella. There is bone marrow edema along the lateral femoral condyle and the medial tibial plateau likely related to direct contusion.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Marked thinning and irregularity of the articular cartilage of the medial femoral condyle with scattered areas of less severe thinning. Subcentimeter loose body within the popliteal cyst2. Cruciate and collateral ligaments appear intact. 3. Menisci appear intact. 