An osteoid osteoma in an open distal femoral epiphysis. A case report.

An osteoid osteoma occurred in the distal femoral epiphysis of an 11-year-old boy. Only eight other cases of this tumor in an open epiphysis have been reported. An image intensifier was used to place the tip of a wire in the center lesion. Removal through a small incision with a bone trephine placed over a guiding Kirschner wire was curative. Bone peripheral to the lesion was replaced, allowing early mobilization without support.