Trevor's Disease: Management Difficulties and Proposed Classification.

Dysplasia epiphysealis hemimelica, also known as Trevor's disease, is a rare developmental disorder with osteocartilagenous overgrowth of the epiphysis or epiphyseal equivalent. The condition bears similarities to osteochondroma in terms of its radiographic appearance, but differs in its pathobiology and geographic occurrence. Unlike the metaphyseal occurrence of osteochondromata, it arises from the epiphysis. The clinical presentation is wide and varied, but mechanical symptoms and deformities predominate. Early reports of the condition suggested involvement of the lower limbs only. However, since then, numerous reports have indicated a more generalized distribution. Difficulties in management and recurrence rates seem to hinge on whether its origin is intra-articular or extra-articular. A new classification system to include these parameters is discussed. [Orthopedics.2016; 39(5):e967-e969.].