Felis ISSN 2398-2950

Carpus: shearing injury

Contributor(s): James Cook, Noel Fitzpatrick

Introduction

  • Cause: HBC (RTA) most common form of trauma; limb abrasion against road surface.
  • Loss of variable amounts of soft tissue and bone usually affecting medial aspect of joint, ie may be large open wound, joint instability due to loss or rupture of supporting ligaments, and loss of bone stock (radial styloid process and medial aspect carpal bones).
  • Hyperextension often occurs, as well as valgus and/or varus instability and subluxation or luxation.
  • Treatment: complicated by open nature of injury: careful open wound management, surgical repair of torn ligaments where possible, external fixation, in some cases eventual arthrodesis.
  • Prognosis: generally good in the cat; chronic local osteomyelitis or septic arthritis may result, necessitating arthrodesis to salvage limb function, or amputation.

Pathogenesis

Etiology

  • Trauma, especially HBC (RTA).

Pathophysiology

  • Variable amounts of soft tissue/bone damage caused by shearing force of, for example, a HBC (RTA).
  • Limb is abraded along road surface causing loss of tissues.

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.
  • Earley T E, Dee J F (1980) Trauma to the carpus, tarsus and phalanges of dogs and cats. Vet Clin North Am Small Anim Pract 10 (3), 717-747 PubMed.

Other sources of information

  • Denny H R A Guide to Canine and Feline Orthopedic Surgery. 3rd edn. Blackwell Scientific Publications. pp 264-275.
  • The Carpus. In: Manual of Small Animal Arthrology. BSAVA. pp 211-233.


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