This 69-year-old presents with knee pain post knee replacement. There is bone loss. Is it aggressive or non-aggressive?
No, this is not aggressive. Posterior zone of transition is too sharp and a little sclerotic (green arrows). There is osteolysis from metal prosthesis with dense material (orange arrow) in the suprapatellar pouch, e.g. particulate disease, metallosis and/or ALVAL aseptic lymphovascular associated lesion. MR often shows metallosis better than CT. For more knee case review, check out MRI Online.