Fig. 5

A revision surgery case. A Standing anteroposterior and lateral radiographs of the right knee demonstrate narrowing of the joint space, consistent with osteoarthritic (OA) changes. B Post-TKA anteroposterior and lateral radiographs of the right knee show a prosthesis in satisfactory position with normal alignment. C Anteroposterior and lateral radiographs of the right knee 15 years after the primary TKA. D CT scan of the right knee 15 years post-TKA. E MRI of the right knee 15 years post-TKA. F Triple-phase bone scan reveals radioactive concentration in the right knee joint. G SPECT/CT imaging identifies focal radionuclide concentration in the lateral tibia. H Intraoperative exploration discloses impingement between the lateral articular surface of the left patella and the lateral condyle of the femoral prosthesis, with cartilage defects and metal debris attachment. I Standing anteroposterior and lateral radiographs following revision surgery. J Standing anteroposterior and lateral radiographs at a one-year follow-up post-revision