Equis ISSN 2398-2977

Common digital extensor tendon: rupture

Contributor(s): Larry Booth, Prof Derek Knottenbelt, Chris Whitton, Graham Munroe

Introduction

  • Cause: occurs in foals. Primary: rare but may be heritable; excessive running with mare. Secondary: to flexural deformities of carpus/metacarpophalangeal joint.
  • Signs: fluctuant swelling on dorsolateral aspect of distal carpus; slight flexion at carpus; abnormal gait.
  • Diagnosis: palpation, radiography, ultrasound.
  • Treatment: rest and supportive/protective bandaging (surgery with debridement +/- suture tendon unnecessary).
  • Prognosis: good.
Print off the Owner factsheet on Tendon injuries to give to your clients.

Pathogenesis

Etiology

Predisposing factors

  • Young foals.

Pathophysiology

  • Primary rupture is less common than secondary and may be due to excessive exercise and overstrain of the tendon.
  • Usually secondary to a flexural deformity Musculoskeletal: flexural deformity/inherited weakness → increased tension in common digital extensor tendon.
  • Ruptured CDET causes secondary tenosynovitis of the extensor tendon sheath. The ends of the tendon may subsequently proliferate and cause further swelling.

Timecourse

  • May be present at birth.
  • May develop within first few weeks of life.

Diagnosis

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Treatment

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Prevention

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Outcomes

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Further Reading

Publications

Refereed papers

Other sources of information

  • Boswell J C & Schramme M C (2011) Rupture of the Common Digital Extensor Tendon. In: Diagnosis and Management of Lameness in the Horse. 2nd edn. Eds: M Ross & S Dyson. Saunders, USA. pp 787-788.

 


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