| Popis: |
Coxofemoral luxation in cattle is a common cause of severe lameness or inability to rise referred to the hip and results in decreased growth, production, and long-term survival of the animal. Numerous techniques have been utilized to stabilize the coxofemoral joint after luxation but are often ineffective due to chronicity of the injury or are not biomechanically strong enough to resist normal biomechanical forces acting on the coxofemoral joint of mature cattle. The aim of this study was to develop a toggle-pin implant to achieve coxofemoral stabilization in mature cattle. Ultimate tensile strength and elongation at failure was measured on the bovine ligament of the head of the femur to determine if the optimum implant had comparable biomechanical properties. 316 Stainless-steel cable and nylon leader line (800 Ib test) were used to create the flexible ligament portion of the implant and this was attached to a custom 316 stainless-steel pin and toggle. These configurations were distracted to failure to compare their biomechanical properties with the ligament of the head of the femur. Additionally, cadaver specimens of eight adult bovine femurs and two coxofemoral joints of calves were evaluated to determine the ideal placement of a prosthetic without significant dissection. The Stainless-steel and nylon prosthetics tested in this study were not biomechanically similar to the native ligament of the head of the femur and thus, not optimal for coxofemoral joint stabilization post luxation. Ideal placement of a prosthetic is distal to the greater trochanter with the hindlimb in slight adduction. |
