Outcomes of controlled tibial tuberosity surgery for dog kneecap

Abstract

OBJECTIVES: The aim of this study was to evaluate the efficacy and outcomes of the tibial tuberosity transposition technique modified using a slow and controlled translation device (mTTT), in dogs with patellar luxation. The technique seeks to realign the quadriceps extensor mechanism using a dedicated device for tibial tuberosity transposition. MATERIALS AND METHODS: Fourteen dogs with grade II medial patellar luxation were included in the study, and 15 stifles were treated using this technique. A partial osteotomy of the tibial tuberosity was performed, followed by its transposition using a dedicated device. Finally, the transposition was stabilized with a pin spacer inserted between the tibial tubercle and the medial cortex of the tibia. Realignment of the quadriceps extensor mechanism was visually evaluated at the end of the surgical procedure and in post-operative radiographic images. The animals were evaluated for the degree of post-operative lameness, quality and time of consolidation of the osteotomy. RESULTS: No animal experienced patellar reluxation after the procedure. Two complications (13.33%) were recorded: one minor (6.66%), represented by a fracture of the osteotomized fragment during tuberosity translation, and one major (6.66%), involving implant migration observed in the post-operative period. One patient (6.66%) showed grade I lameness at 30 days, but the others did not present lameness (grade 0). At 60 days, no lameness was observed in any animal. Bone consolidation was considered excellent in 12 cases (80%), good in one case (6.66%) and reasonable in two cases (13.33%) at 30 days after the surgery and excellent in all cases at 60 days. CLINICAL SIGNIFICANCE: The results confirm that the mTTT technique is an effective alternative with excellent results and low complication rates in treating dogs with grade II medial patellar luxation.