Abstract
AbstractThis report describes a clinical case of a press fit biological fixation femoral implant neck fracture (fatigue failure) and its revisions in a dog. A total hip arthroplasty revision was performed. The stem was replaced with a bigger one through a V-shape osteotomy of the proximal–lateral aspect of the femur. Stabilization was accomplished using a locking plate and two over-the-plate cerclage wires. Subsidence of the femoral stem occurred following revision and was revised with a second revision in which a collared stem was used. Two revision surgeries were necessary to have a stable functional prosthesis with successful bone integration at 7 months postoperative revaluation. Major errors encountered in this case were placement of an undersized stem and an inadequate femoral canal stability/press-fit. Fracture of a BFX femoral stem neck has not been previously reported.
Highlights
Total hip replacement (THR) is a surgical procedure performed to manage coxofemoral pathology.[1]
Total hip replacement eliminates peripheral pain and central sensitization resulting from hip dysplasia.[2,3]
At the time of the initial THR surgery performed on this patient, a size chart correlating recommended implant size and patient body weight were not yet available from the manufacturer
Summary
Total hip replacement (THR) is a surgical procedure performed to manage coxofemoral pathology.[1]. Complications encountered after canine THR include luxation, infection, implant failure, granuloma formation, aseptic loosening, femoral fracture, stem subsidence, sciatic neurapraxia, pulmonary embolism, femoral medullary infarction and osteosarcoma.[1]. Cementless THR systems have been introduced to avoid cement-related complications, such as aseptic loosening and irreversible infection.[15,16] The biological fixation system (BFX) is a cementless hip prosthesis in which the cup and stem are designed to achieve initial press-fit stability and, later on, long-term stability through porous bone ingrowth.[17] This report describes a clinical case of a BFX femoral stem neck fracture (fatigue failure) and its revisions
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