Objective- One of the most common orthopedic conditions encountered in dogs is patellar luxation. Most luxations are primarily a developmental condition, because they occur early in life and are not associated with trauma. These luxations are divided into the medial and lateral dislocation. Medial luxation is much more common than lateral luxation in all breeds (75-80%), and bilateral involvement seen in 20% to 25% of cases. The purpose of our study was to determine the frequency of age, sex, breed, concomitant disease, and surgical procedure in dogs with patellar luxation. Design- A case series study Animals- Twenty two dogs were presented to the Veterinary Teaching Hospital of Ferdowsi University of Mashhad during the last three years. Procedures-Details regarding breed, sex, age, kind of luxation, concomitant disease, and surgical procedure were obtained from the medical records. Results- Twenty two dogs (8 males and 14 females) were included. Age and weight average were 2.33 and 10.57 respectively. One case had unilateral lateral dislocation, seventeen cases had unilateral medial, and finally four cases had bilateral medial luxation. Based on the different grade of patellar luxation, three distincttechniques were chosen. Conclusion and Clinical Relevance- In the present study of patellar luxation in different breeds of dogs, terriers were over-represented (31.8%). In the study of Gibbons and co-workers in 2006 there were 97% medial luxations, as well asin our review the most luxation were medial (18.18% bilateral and 77.27% unilateral). In our study 27.27% of cases had a history of trauma, but in the other studies most of them were developmental. Patellar luxation occurs most often early in life.

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