Skeletal Manifestations of Heritable Disproportionate Dwarfism in Cats as Determined by Radiography and Magnetic Resonance Imaging

Lisa M. Anderson, Derek B. Fox, Kari L. Chesney, Joan R. Coates, Bryan T. Torres, Leslie A. Lyons

Research output: Contribution to journalArticlepeer-review

Abstract

Objective  The aim of this study was to characterize the radiographic alignment of thoracic and pelvic limbs and evaluate for intervertebral disc disease in cats with feline disproportionate dwarfism (FDD). Study Design  Observational cross-sectional study. Radiographic joint orientation angles were measured in 10 thoracic and pelvic limbs from 5 FDD cats and compared with those angles measured in 24 thoracic limbs and 100 pelvic limbs from skeletally normal cats. Magnetic resonance imaging of the spine was performed in 2 FDD cats for the evaluation of pathology of the intervertebral discs or vertebrae. Results  All limbs from FDD cats possessed deformities. FDD humeri demonstrated procurvatum proximally, and recurvatum distally in the sagittal plane, but showed no difference in the frontal plane. FDD radii possessed excessive recurvatum proximally, and procurvatum distally in the sagittal plane, and varus proximally and valgus distally in the frontal plane. Whereas no torsion was discernible in the humeri, all radii had external torsion. In the frontal plane, FDD femurs exhibited varus both proximally and distally whereas the tibia possessed proximal valgus and distal varus. No torsion in the pelvic limbs was observed. No spinal pathology was detected in the FDD cats included in the original study. Conclusion  Feline disproportionate dwarfism results in significant appendicular deformity in all limbs. The incidence of intervertebral disc degeneration in FDD cats is inconclusive.

Original languageEnglish (US)
JournalVeterinary and Comparative Orthopaedics and Traumatology
DOIs
StateAccepted/In press - 2021
Externally publishedYes

Keywords

  • angular limb deformities
  • chondrodysplasia
  • disproportionate dwarfism
  • joint orientation angles
  • Munchkin cat

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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