Equis ISSN 2398-2977

Carpus: osteochondroma

Synonym(s): Supracarpal volar exostoses

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

Introduction

  • Cause: probably a hereditary skeletal disorder (dominant autosomal) - solitary exostosis occurs on the distal end of the radius; multiple exostoses can occur on long bones, ribs and pelvis.
  • Signs: carpal sheath swelling, forelimb lameness   Musculoskeletal: gait evaluation  , palpable bony lump on caudomedial aspect of radius; pain on palpation; reduced carpal flexion   Musculoskeletal: manipulative tests  .
  • Diagnosis: radiography.
  • Treatment: surgery - excision of osteochondroma.
  • Prognosis: good following surgery.

Pathogenesis

Etiology

  • Genetic fault interferes with fetal osteogenesis.

Pathophysiology

  • Abnormal periosteal growth   →   local metaplastic cartilage develops in metaphysis/diaphysis   →   endochrondral ossification   →   exostosis continuous with cortex and has a cartilage cap.

Diagnosis

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Treatment

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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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