Canis ISSN: 2398-2942

Arthritis: synovial osteochondromatosis

Synonym(s): Synovial chondrometaplasia

Contributor(s): John Innes

Introduction

  • Chondroma/osteochondroma formation within synovium +/- detachment → loose bodies in joint.
  • Uncommon; benign; especially hip, shoulder.
  • Signs: pain, stiffness, joint swelling, limited range of joint movement, 'fixing' of joint.
  • Diagnosis: radiography.
  • Treatment: partial synovectomy +/- removal of loose bodies.
  • Prognosis: fair.

Pathogenesis

Etiology

  • Unknown.

Pathophysiology

  • Formation of multiple cartilagenous/osteocartilagenous nodules of synovium.
  • ?Synovial metaplasia → villous proliferation, islands of cartilage and calcification within synovia, detachment of affected villi → loose bodies within joint → joint swelling, pain, lameness +/- joint 'fixing' when loose body lodges in joint space preventing normal movement.
  • Secondary arthritic changes usually develop - difficult to decide whether chondrometaplasia is primary or secondary.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers


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