Objective: To report radiographic findings and complications after fracture repair with a new polyaxial locking plate system (PLS polyaxial locking system; Aesculap/B Braun, Tuttlingen, Germany) in dogs and cats. Study design: Retrospective case review from four veterinary practices. Sample population: Twenty-six dogs and 14 cats (40 long bone fractures). Methods: Medical and radiographic records of dogs and cats with long bone fractures treated with the PLS were reviewed. Cases were included when operative records were complete and included documentation of radiographic union or complications. Phone interviews of owners were performed for longterm follow-up. Ancillary methods of fracture fixation and associated complications were recorded. Results: Only two complications were recorded, one of which required a revision surgery. Radiographic follow-up was performed for all fractures. Radiographic union without complications was achieved in 38 of 40 (95%) fractures. Radiographic union was documented before 60 days in 19 of 40 (47.5%) fractures, between 61 and 90 days in 15 of 40 (37.5%) fractures, and after 90 days in six of 40 (15%) fractures. A functional union was observed at a mean time ± SD of 70.8 ± 38.9 days (range, 32-182). One or more ancillary fixation methods were used in 27 of 40 (67.5%) fractures. Conclusion: The PLS polyaxial locking system was often used with adjunct fixation in this series, and radiographically confirmed healing without complications was documented in most cases. Clinical significance: Use of the PLS can result in high success rates for fracture repair in dogs and cats, but ancillary fixation should be strongly considered.

The preliminary results of this study support the use of TPLO in cats, but larger case numbers are needed to evaluate its practicability, as well as long-term outcome (>1 year), especially evaluating the development and the clinical relevance of osteoarthritis.