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Vet Comp Orthop Traumatol. 2010;23(5):306-17. doi: 10.3415/VCOT-09-04-0045. Epub 2010 Aug 25.

Canine hip dysplasia treated by juvenile pubic symphysiodesis. Part I: two year results of computed tomography and distraction index.

Author information

1
Department of Surgical Sciences, University of Wisconsin, Madison, Wisconsin, USA. duelandt@svm.vetmed.wisc.edu

Erratum in

  • Vet Comp Orthop Traumatol. 2010;23(6):472.

Abstract

OBJECTIVES:

To measure one and two year effects of juvenile pubic symphysiodesis (JPS) in puppies defined as 'at-risk' for canine hip dysplasia (CHD) using the following objective hip conformation criteria: Acetabular angle (AA), dorsal acetabular rim angle (DARA) and hip laxity (PennHIP© distraction index (DI).

DESIGN:

Controlled clinical case study.

ANIMALS:

Thirty-nine dysplastic puppies (six controls).

PROCEDURES:

The dogs were anaesthetised and acetabular angle, DARA, and DI values were obtained by computed tomography and radiography preoperatively. Electro-cautery fusion of the pubic symphysis was performed between 12 - 24 weeks of age. The imaging was repeated at one and two years of age.

RESULTS:

Significant hip improvements were seen at the two-year follow-up appointments for: AA (JPS dogs 31% increase, control 3%), DARA (JPS 38% decrease, control 15%) and DI (JPS 41% decrease in laxity, controls 20%) for all postoperative versus preoperative values. Pubic fusion occurred with minor morbidity.

CONCLUSION:

Juvenile pubic symphysiodesis resulted in significant improvements in hip conformation (AA and DARA), especially in mild to moderately lax hips (DI = 0.40-0.69). Most dogs with DI≥0.70 increased in osteoarthritis grade by two years of age.

CLINICAL RELEVANCE:

Juvenile pubic symphysiodesis surgery at 12-24 weeks of age significantly improved hip conformation and decreased laxity in at-risk CHD dogs. Early-age (12 to 16 week) recognition of hip laxity offered greater JPS benefits than surgery performed at 19- to 24-weeks-old. Dogs with severe laxity (DI≥0.70) continued to increase in osteoarthritis. An early (12-16 weeks) positive laxity test (Ortolani) should alert one to obtain objective laxity determinations (PennHIP© DI).

PMID:
20740258
DOI:
10.3415/VCOT-09-04-0045
[Indexed for MEDLINE]

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