Haste intramedular bloqueada na estabilização de osteotomia intertrocantérica varizante em cães – estudo ex vivo

Abstract

Intertrochanteric varus osteotomy (IVO) aims to decrease the angle of head and femoral neck, commonly increased in dysplastic animals. It can be stabilized by different methods, and the compression plate and screws is the most commonly applied. The application of locked intramedullary nail (IN) in femoral fractures has been more efficient and faster than the compressive plates. However, is not known if the IN would be effective in stabilization post IVO. Thus, this study aimed to compare the application of the IN post IVO with compression plate. For this, were used ten canine cadavers weighing more than 15 kg, with both intact femurs. In the left femur were performed IVO, with bone wedge removal of 20o on the medial side and fixation with IN. The contralateral femurs were used as control and, after performing the same surgical technique, the bone segments were fixed with compression plates and screws. The hip joints were radiographed in Ventrodorsal projection, and compared the angles of Norberg and inclination of the head and femoral neck (IHF), obtained before and after surgery. The time spent for the placement of implants as compared too. IHF between the fixing methods before and after surgery. Finally, there was an increase of Norberg angle (from 106.84 ± 5.55o to 111.22o ± 3.89) only in the IN group; Similar results between the two groups were obtained with regard to reducing the IHF angle and the implant placement time compared to the compression plate. Thus, the use of IN post IVO stabilization was feasible in cadavers, producing similar results to the plate in relation to the execution time and reducing the angle IHF, and increasing the Norberg angle.