Patellar Morphology in Small Breed Dogs With Medial Patellar Luxation

Document Type : Original Article

Author

Department of Veterinary Surgery, Faculty of Veterinary Medicine, Trakia University – Stara Zagora, Bulgaria

Abstract

The aim of the present study was to assess the morphology of patella on tangential radiographs in healthy dogs and dogs affected with grade II and III medial patellar luxation (MPL). The study was done on 57 dogs (42 with MPL and 15 healthy) from Mini-Pinscher, Pomeranian, Yorkshire Terrier, and Chihuahua breeds. Seven morphometric parameters associated with patellar shape were measured – retropatellar angle of Wiberg, lateral and medial patellar facet angles, lateral and medial facet lengths, horizontal patellar diameter and patellar thickness. The results demonstrated altered shape and thickness of the patella in stifle joints affected with MPL, which were more pronounced in grade III. Medial patellar luxation resulted in statistically significantly increased values of Wiberg angles and substantial reduction of lateral facet angle and patellar thickness. Altered shape of the patella was manifested with hypoplasia of patellar apex, lower patellar thickness and concave aspect of its lateral facet. These changes in patellar morphology in small breed dogs with grade II and III MPL suggested that the altered shape and thickness of the kneecap occurred consequently to the condition.

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History

  • Receive Date: 11 February 2022
  • Revise Date: 20 May 2022
  • Accept Date: 12 June 2022

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