Evaluate for osteomyelitis. History of septic joint and knee pain/swelling. Several sequences are limited by patient motion artifact. There is a moderate sized joint effusion with thick rim enhancement consistent with septic arthritis. Multifocal subchondral bony erosions are present, most significant at the medial tibial plateau and medial femoral condyle. There is also edema within the distal femoral metadiaphysis and tibial metadiaphysis which likely represents a combination of reactive osteitis and osteomyelitis. We see no discrete intraosseous abscess. Small subchondral erosion of the patella with mild marrow edema is present. The bone marrow intensity within the fibula appears normal. There is also suggestion of periosteal reaction along the distal femur and proximal tibia. There is enhancement of soft tissues above the suprapatellar pouch, as well as the popliteus and quadriceps muscles, indicating inflammation. There is also a defect involving the distal quadriceps tendon, which may reflect a partial tear or prior surgery. The posterior horn of the medial meniscus along with much of the body is not visible, and the anterior horn of the medial meniscus is displaced anteriorly, indicating extensive tearing/destruction. The lateral meniscus appears intact. Cartilage loss most markedly affects the medial tibiofemoral compartment.The anterior cruciate and posterior cruciate ligaments are intact. There is edema and enhancement along the medial collateral ligament, but the ligament appears intact. The lateral collateral ligament complex appears intact.
Septic arthritis with bony erosion/osteomyelitis and other findings as described above.