Equis ISSN 2398-2977

Carpus: osteochondroma

Synonym(s): Supracarpal volar exostoses

Contributor(s): Prof Derek Knottenbelt, Vetstream Ltd, Chris Whitton, Anna Hollis

Introduction

  • Rare, benign, cartilage-capped tumor attached to bone, usually by a bony stalk.
  • Cause: solitary exostoses occurs on the distal end of the radius; no breed or hereditary predisposition is known for the solitary form of the disease.
  • Multiple exostises can occur on long bones, ribs and pelvis in the hereditary form of the disease, which is osteochondromatosis.
  • Signs: carpal sheath swelling, forelimb lameness, palpable bony lump on caudomedial aspect of radius; pain on palpation; reduced carpal flexion.
  • Diagnosis: radiography.
  • Treatment: surgery - excision of osteochondroma.
  • Prognosis: good following surgery.

Pathogenesis

Etiology

  • Unknown, likely to be due to the dysplastic physeal growth rather than a true neoplasm.

Pathophysiology

  • May result from separation of a portion of the metaphyseal growth plate margin leading to an island of chondrogenic tissue that is capable of endochondral ossification, carried into the metaphysis during growth of the bone.
  • This leads to a cartilage-capped mushroom or sessile exostosis that projects from the metaphyseal surface.
  • Growth stops at skeletal maturity.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Newman J C (2014) Surgical treatment of synovial osteochondromatosis in the middle carpal joint of a pony. Equine Vet Educ 26 (8), 395-399 WileyBlackwell.


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