Knee pain and effusion Tendons and ligaments: The anterior cruciate ligament and the posterior cruciate ligaments are intact.The medial collateral ligament is intact. The lateral collateral ligament, the biceps femoris tendon, the popliteus tendon and the iliotibial band are intact. The quadriceps tendon and the patellar tendon are intact.Menisci: There is maceration of the medial meniscus body and posterior horn. There is mild anterior extrusion of the anterior horn of the medial meniscus. There is an obliquely oriented tear of the posterior horn of the lateral meniscus.Joints:There is extensive cartilage loss of the medial femoral condyle with a small amount of reactive marrow edema along the posterior aspect. Similar although less severe cartilage loss is also identified in the lateral compartment. Again noted are apparent erosions of the medial cortex of the femur.The patellofemoral articulation is intact and without evidence of subluxation and articular cartilage defect.Joint effusion and soft tissues: There is a trace amount of joint fluid with thickened enhancing synovium. Additionally, a small focus of signal void is seen in the anterior joint space which demonstrates some associated artifact. A mild amount of subcutaneous edema is present.Osseous structures: No focal marrow replacing lesions are identified. There is no fracture.
1. Diffuse synovitis with apparent erosions of the medial joint space. Additionally, there is extensive cartilage loss particularly of the medial compartment with a mild amount of reactive marrow change in the posterior aspect of the medial femoral condyle. These findings are again nonspecific and may be inflammatory in nature however the possibility of infection cannot be excluded.2. Maceration of the posterior horn of the medial meniscus with oblique tear of the posterior horn of the lateral meniscus.3. Small focus of signal abnormality within the joint may represent either a small focus of gas or small metallic artifact possibly from instrumentation of the knee such as scope or aspiration