Revision of a Press Fit Biological Fixation Stem Fracture in a Dog

This 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.