Felis ISSN 2398-2950

Arthritis: synovial osteochondromatosis

Synonym(s): Synovial chondrometaplasia

Contributor(s): John Innes, Eithne Comerford

Introduction

  • Chondroma/osteochondroma formation within synovium +/- detachment    →    loose bodies in joint or can be found extra-articularly around any synovial joint.
  • Uncommon; benign; has been reported in the stifle joint in cats.
  • Signs: may be found incidentally on radiographs, pain, stiffness, joint swelling, limited range of joint movement, 'fixing' of joint.
  • Diagnosis: radiography.
  • Treatment: partial synovectomy +/- removal of loose bodies if seriously affected.
  • 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

  • Recent references from PubMed and VetMedResource.
  • Allan G S (2000) Radiographic features of feline joint diseases. Vet Clin North Am Small Anim Pract 30 (2), 281-302 PubMed.


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