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Interobserver Repeatability of Measurements on Computed Tomography Images of Lax Canine Hip Joints from Youth to Maturity

Authors

  • MANDI J. LOPEZ DVM, MS, PhD, Diplomate ACVS,

    1. Comparative Orthopaedic Research Laboratory, School of Veterinary Medicine, University of Wisconsin, Madison, WI
    2. Laboratory for Equine and Comparative Orthopedic Research, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA.
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  • KECHIA M. DAVIS DVM, Diplomate ACVS,

    1. Comparative Orthopaedic Research Laboratory, School of Veterinary Medicine, University of Wisconsin, Madison, WI
    2. Laboratory for Equine and Comparative Orthopedic Research, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA.
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  • SUSAN L. JEFFREY-BORGER BA, MS, DVM,

    1. Comparative Orthopaedic Research Laboratory, School of Veterinary Medicine, University of Wisconsin, Madison, WI
    2. Laboratory for Equine and Comparative Orthopedic Research, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA.
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  • MARK D. MARKEL DVM, PhD, Diplomate ACVS,

    1. Comparative Orthopaedic Research Laboratory, School of Veterinary Medicine, University of Wisconsin, Madison, WI
    2. Laboratory for Equine and Comparative Orthopedic Research, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA.
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  • CHRISTY RETTENMUND DVM

    1. Comparative Orthopaedic Research Laboratory, School of Veterinary Medicine, University of Wisconsin, Madison, WI
    2. Laboratory for Equine and Comparative Orthopedic Research, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA.
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  • Supported in part by the National Institutes of Health (grant no. K01 AR002174), the Arthritis Foundation, and the University of Wisconsin–Madison Companion Animal Fund.

  • Presented at the American College of Veterinary Surgeons Veterinary Symposium the Surgical Summit, Denver, CO, October 2004.

Corresponding author: Dr. Mandi J. Lopez, DVM, MS, PhD, Laboratory for Equine and Comparative Orthopedic Research, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803. E-mail: mlopez@vetmed.lsu.edu.

Abstract

Objectives— To determine interobserver repeatability of measurements on computed tomography (CT) images of lax canine hip joints at different ages and in the presence of degenerative joint disease at maturity.

Study Design— Longitudinal observational investigation.

Animals— Sibling crossbreed hounds.

Methods— Pelvic CT was performed at 20, 24, 32, 48, 68, and 104 weeks of age. Measures were performed on 3 contiguous two-dimensional (2D) transverse CT images of both hips at each time point by 3 investigators. Center-edge angle (CEA), horizontal toit externe angle (HTEA), ventral (VASA), dorsal (DASA), and horizontal (HASA) acetabular sector angles, acetabular index (AI), and percent femoral head coverage (CPC) were measured. Interobserver repeatability was quantified with the intraclass correlation coefficient (ICC). Satisfactory repeatability was considered when ICC≥0.75.

Results— DASA, CEA, and CPC were repeatable in all age groups. HASA and HTEA were repeatable for all but 1 time point. At 20 weeks of age, all measures but AI were repeatable, and at 104 weeks of age, DASA, CEA, CPC, and HASA were repeatable. Measures were repeatable in hips with and without degenerative changes with the exceptions of AI and HASA in normal hips and VASA and HTEA in osteoarthritic hips.

Conclusions— Most 2D CT measurements examined were repeatable regardless of age or joint disease.

Clinical Relevance— Two-dimensional CT measures may augment current techniques for assessing joint changes in lax canine hips.

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