Equis ISSN 2398-2977

Bone: physitis

Contributor(s): Prof Gary M Baxter, Vetstream Ltd, Chris Whitton

Introduction

  • Cause: a developmental orthopedic disease due to overloading of the metaphyseal growth plate; may be associated with osteochondrosis   Bone: osteochondrosis  .
  • Signs: lameness, pain and swelling in the region of a growth plate; may respond to confinement (reduced activity) or dietary change. May be unilateral, bilateral or affect all four limbs.
  • Diagnosis: radiography - retained cartilage cores, periosteal new bone, irregularly thickened growth plate, metaphyseal sclerosis, abnormal trabecular patterns.
  • Treatment: reduce exercise, reduce weight, evaluate diet, correct excess or deficiency; treat osteochondrosis and limb deformities; NSAIDs, eg phenylbutazone   Phenylbutazone  as necessary.
  • Prognosis: resolves spontaneously; depends on degree of articular damage or limb deformity at time of diagnosis.
  • See also:

Pathogenesis

Etiology

  • May include nutrition, growth rate, heredity, trauma.
    Diet
  • Low calcium, high phosphorus.
  • High grain, low roughage.
  • Low copper.
    Trauma
  • Heavy bodyweight.
  • Active foals, yearlings.
  • Contralateral lameness   →   increased weight bearing on affected limb.
  • Angular limb deformity   →   increased loading on one side of the growth plate.

Pathophysiology

  • Increased loading of physeal cartilage +/- susceptible cartilage   →   altered endochondral ossification.

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.
  • Jackson M A, Kummer M, Auer J A, Ossent P & Paar M (2011) Severe bilateral physitis with instability and Salter-Harris type 1 fractures in two foals. Equine Vet Educ 23 (11), 543-547 VetMedResource.
  • Bramlage L R (2011) Physitis in the horse. Equine Vet Educ 23 (11), 548-552 Wiley Online Library.
  • Kelmer G & Hayes M E (2009) Regional limb perfusion with erythromycin for treatment of septic physitis and arthritis caused by Rhodococcus equiVet Rec 165 (10), 291-292 PubMed.
  • Munsterman A S, Alexander K, Samii V F & Latimer F G (2007) Computed tomography in the diagnosis of septic physitis in two foals. Equine Vet Educ 19 (4), 200-206 VetMedResource.


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