Fig. 1

Antero-posterior (AP) and lateral view of the right knee of a 68-year old patient who underwent a second-stage revision total knee arthroplasty. A non-progressive radiolucent line of 1–2 mm around the stem, the anterior part of the femoral sleeve and the tibial plate are seen in radiographs taken 7 years postoperatively. Clinically, the patient had no signs of loosening