Hereditary Multiple Exostoses with Ulnar Hemimelia

Hereditary Multiple Exostoses is a skeletal dysplasia that is very rare and defined by formation of numerous cartilage capped benign tumours either pedunculated or sessile known as osteochondromas throughout skeleton especially around the growth plates of ribs, vertebrae, pelvis and long bones. Rarely it can present forearm problems such bowing deformity of radius, ulnar shortening and radiocapitellar dislocation or subluxation. We are presenting a case of 20 year old female who presented with left distal ulnar exostosis resulting in ulnar shortening and radial bowing with restricted supination and pronation range of movement. Other complaint was of multiple non tender bony hard lumps in both upper and lower limbs. Excision of distal ulnar exostosis was done which resulted in marked improvement in pronation and supination range of movement. Hereditary multiple exostoses with forearm deformities though very rare but can present and the treatment is conservative except if any bony swelling manifests any complications such as pain or associated deformity.