Equis ISSN 2398-2977

SDFT: luxation

Contributor(s): Larry Booth, Patrick Colahan, Vetstream Ltd, Chris Whitton, Jarred Williams

Introduction

Print off the Owner factsheet on Tendon injuries to give to your clients.

Pathogenesis

Etiology

  • Trauma.

Predisposing factors

General

  • Excessive tension, particularly during flexion.

Pathophysiology

  • Trauma, eg impact or sudden stopping with hock flexed → rupture of medial retinacular band (possibly lateral band) → lateral (or medial) displacement of tendon → mechanical instability → gait deficit.
  • Additionally, the SDFT can split longitudinally in the middle and a portion of the tendon can displace to either side of the calcaneus.

Timecourse

  • Acutely, swelling and immediate gait abnormality can be observed.
  • Chronically, a permanent luxation can occur, in which the SDFT is maintained in a straighter position because it is no longer along the back of the calcaneus. The end result of this scenario is hyperextension of the fetlock due to the increased length of tendon.

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.
  • Wright I M & Minshall G J (2012) Injuries of the calcanean insertions of the superficial digital flexor tendon in 19 horses. Equine Vet J 44 (2), 136-142 PubMed.
  • Dik K J & Leitch M (1995) Soft tissue injuries of the tarsus. Vet Clin North Am Equine Pract. 11 (2), 235-247 PubMed.
  • Meagher D M & Aldrete A V (1989) Lateral luxation of the superficial digital flexor tendon from the calcaneal tuber in two horses. J Am Vet Med Assoc 195 (4), 495-498 PubMed.
  • Scott E A (1983) Surgical repair of a dislocated superficial digital flexor tendon and fractured fibular tarsal bone in a horse. J Am Vet Med Assoc 183 (3), 332-333 PubMed.
  • Scott E A & Breuhaus B (1982) Surgical repair of a dislocated superficial digital flexor tendon in a horse. J Am Vet Med Assoc 181 (2), 171-172 PubMed.

Other sources of information


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