Structural abnormalities (osteophytes, cartilage loss, bone marrow lesions (BMLs), subchondral cysts, meniscal abnormalities, effusion, Baker's cyst) at 9 patellofemoral and tibiofemoral locations ...

Radiographs of 77-year-old man, 11 years after primary total knee arthroplasty, who presented with asymptomatic effusion and minimal instability. (A) Preoperative anteroposterior radiograph.