Arthroscopic removal as an effective treatment option for intra-articular osteoid osteoma of the knee

Figure 1 Sequential arthroscopic views of the anteromedial part of the femur above the cartilage with the arthroscope in the anterolateral portal. A: synovial hyperplasia; B: Palpation of the elevated synovial tissue with a probe; C: Removal of the synovial tissue reveals the altered tissue; D and E: After partial removal, the extensiveness of the altered tissue is revealed; F: The remaining crater after complete removal of the lesion.