65-year-old male patient with medial sided knee pain for six weeks. No trauma. Evaluate for injury to account for pain. MENISCI: There is complex tearing of the posterior horn of the medial meniscus with radial and vertical components. The lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is generalized thinning of the weightbearing articular cartilage of the lateral femoral condyle and lateral tibial plateau. There is marked thinning of the articular cartilage of the weightbearing portion of the medial femoral condyle. There is a partial-thickness defect within the lateral facet of the patellar articular cartilage.There is a crescentic region of low signal intensity on T1 and T2-weighted images within the weightbearing portion of the medial femoral condyle with significant surrounding increased T2 signal compatible with bone edema (image 17, series 1101 and image 17, series 1201). These findings are consistent with an osteochondral fracture. No intervening T2 signal intensity is identified to suggest instability. The underlying cartilage is intact though markedly thinned.LIGAMENTS: The cruciate and collateral ligaments are intact. EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1. Osteochondral fracture of the medial femoral condyle without evidence of instability and surrounding bone edema.2. Complex tearing of the posterior horn of the medial meniscus.3. Chondromalacia.