The patient is a six-year-old boy who developped pain in his right knee after minor trauma to the right knee. He was seen by us 2 months later with the chief complaints of limp and extension block of the right knee with atrophy of the Quadriceps muscle. Plain roentogenograms of the knee showed no abnormalities of the bone. Arthrogram and arthroscopy revealed no intra-articular abnormalities such as discoid meniscus.
The patient was followed at outpatient clinic with the medication of aspirin which relieved pain trasiently. Repeated roentgenographic examination, performed 2 months later, revealed rudiolucent lesion to the posterior aspect of proximal metaphysis of the tibia. Tomogram and bone scan confirmed the Nidus in the lesion which suggested Osteoid Osteoma.
The lesion was completely removed surgically. Histological diagnosis was Osteoid Osteoma. The patient has been completely asymptomatic postopertively with full range of motion of the knee.
