Epiphyseal Osteochondroma

Epiphyseal Osteochondroma, imaging of dysplasia epiphysealis hemimelica (trevor disease) of the ankle
Imaging of dysplasia epiphysealis hemimelica (Trevor disease) of the ankle. Image by Kgokkus, Wikimedia Commons, CC BY-SA 3.0.

Also Known As

  • dysplasia epiphysealis hemimelica
  • Trevor’s disease

Epidemiology

  • Very rare

Aetiology

  • Non familial developmental disorder
  • Benign

Presentation

  • Manifests in young children
  • Unilateral enlargement of an epiphysis
  • Most commonly affects lower femur, upper tibia & talus
  • If affecting the proximal femoral epiphysis can be confused with Perthes disease
  • Can cause varus or valgus deformity

Histology

Histology of an osteochondroma, which epiphyseal osteochondroma resembles
Histology of an osteochondroma, which epiphyseal osteochondroma resembles. Image by Atsi79, Wikimedia Commons, CC BY-SA 3.0.
  • resembles an osteochondroma, with a cartilage cap of disorganised cartilage

Treatment

  • surgical excision

Reviewed by Professor Phong Tran, Head of Orthopaedic Surgery, Western Health. Last updated 10 October 2026.