Introduction

A 5-year-old boy presented with multiple bony swellings around his knees, wrists, shoulders, and rib cage. He was in good general health and there was no history of trauma, but his father was concerned about increasing deformity of the child's knees and the gradual increase in size of the swellings around his wrists, chest and knees. On examination, there were bilateral multiple fixed bony outgrowths from the distal radius, medial side of lower femur, upper end of humerus and costochondral junctions. The child had mild genu valgum on the left side. There was no deformity or swelling of the fingers. Movements at the shoulder, hip and knee were within normal limits and there was no neurovascular problem. The father had similar bony swellings around his knees and shoulder but was not bothered about these because they were not growing and he had no functional problems. Plain X-rays of the knees, . . . [Full text of this article]