ISSN 2398-2950      

Carpus: hyperextension

ffelis
Contributor(s):

Sorrel Langley-Hobbs


Introduction

  • Rare injury.
  • Cause: fall from a height, or during exercise.
  • Hyperextension may occur secondary to polyarthropathy or systemic disease.
  • Signs: a) acute injury - pain, non-weight-bearing lameness, soft tissue swelling; b) chronic or degenerative injuries - often relatively painless, abnormal hyperextended joint posture when weight-bearing.
  • Diagnosis: hyperextended stance, imaging to rule out other causes.
  • Treatment: arthrodesis - panarthrodesis if antebrachiocarpal joint affected.
  • Prognosis: guarded without treatment.

Pathogenesis

Etiology

Pathophysiology

  • Carpal joint hyperextension caused by disruption of palmar soft tissue supporting elements, resulting in subluxation or luxation of carpal joint (any articulation(s)).
  • Most commonly affects the antebrachiocarpal joint (50%).

Acute traumatic

  • Disruption of palmar soft tissue supporting elements of carpus cause subluxation or luxation of joint at any articulation(s).

Inflammatory polyarthropathy

  • Insidious onset joint laxity.

Degenerative

  • May occur secondary to diabetes mellitus.

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.
  • Greeff D R, Owen M, Bush M (2014) Management of carpal hyperextension injury in a cat using combined temporary transarticular internal and external skeletal fixation. J Feline Med Surg 16 (10), 842-845 PubMed.
  • Nakladal B, vom Hagen F, Brunnberg M et al (2013) Carpal joint injuries in cats - an epidemiological study. Vet Comp Orthop Traumatol 26 (5), 333-339 PubMed.

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