Ex vivo postimplantation biomechanical properties of a press-fit cementless femoral stem with transfixation pin for canine total hip replacement

T otal hip replacement (THR) is the surgical treatment of choice for large adult dogs with hip osteoarthritis when medical treatment is no longer effective, with THR leading to recovery of hip joint function in 85% to 95% of cases. 1,2 Implant stability is essential during the early postoperative period and depends on factors such as the shape and material of the implant, and properties of the surrounding bone. 3,4 Historically, cemented prostheses for THR were the first prostheses released on the veterinary market. With these protheses, the femoral stem is fixed in the bone by adhesion with polymethyl methacrylate cement (PMMA). After polymerization of the cement, the primary stability is excellent, 5 and short-term clinical outcomes are generally good to excellent in 84% of cases, with middle-and long-term ; 18 cadaveric femurs from 9 dogs.