Arthroscopic Excision of an Intra-articular Osteoid Osteoma in the Trochlear Notch of Ulna - A Case Report.

Introduction: Osteoid osteoma (OO) is a benign osteoblastic skeletal lesion commonly affecting the diaphysis of long bones. Intra-articular lesions, which present with atypical symptoms, are uncommon and elbow joint involvement is only rarely reported. Conservative treatment is ineffective and surgical excision or ablation is the therapeutic goal in symptomatic patients.