Intracapsular metaphyseal osteoid osteoma of the femoral neck.

The authors discuss the 20 cases of intracapsular metaphyseal osteoid osteoma of the neck of the femur found among the total 186 cases of osteoid osteoma on the files of the Tumour Centre of the Rizzoli Orthopaedic Institute. They assess the diagnostic methods that can be used to determine the precise position of the "nidus" with reference to the surgical route to be used. The operation must expose the osteoid osteoma directly by opening the joint.