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

Figure 2 Sequential arthroscopic views of posterior part of lateral femoral condyle with the arthroscope positioned in the posteromedial portal. A: Trans-septal approach; B: Palpation of the altered tissue with a probe from the posterolateral portal; C: Removal of the altered tissue with a cochlea; D: Visualization of the sclerotic bone after removal of altered tissue; E: Removal of the nidus and surrounding sclerosis with a motorized instrument; F: The remaining crater after complete removal of the lesion.