Determinação radiográfica dos ângulos da tíbia proximal de cães e gatos com e sem ruptura do ligamento cruzado cranial

Abstract

The influence of conformation of the proximal tibia in the rupture of the cranial cruciate ligament (CCL) is still controversial. In dogs, the breed that displays the highest prevalence of CCL rupture is the Labrador Retriever. Conversely, cats are characterized by low rupture frequency of the ligament. Two main studies were done. The first study was performed comparing the proximal tibial angles between Labrador Retriever dogs and other dog breeds with and without a CCL rupture. The second study was conducted comparing the proximal tibial angles between dogs and cats with and without a CCL rupture. In both studies, the radiographic images of the stifle joint were evaluated for the angles of the tibial plateau, the angles between the patellar ligament and the tibial plateau, the angles between the patellar ligament and the common tangent at the tibiofemoral contact point, and the angles between the insertion of the patellar ligament and tibiofemoral contact point. In the first study, it was concluded that the predisposition of Labrador Retriever breed for CCL rupture is not justified by the conformation of the angles of the proximal tibia. In the second study, it was concluded that there is a possible influence of the tibial plateau angle and the angle of insertion of the patellar ligament in the etiology of the CCL rupture in dogs. The angle of the patellar ligament with the common tangent at the tibiofemoral contact point can influence the low incidence of the CCL rupture in cats.