Treatment of Periprosthetic Nonunions of the Lower Extremity.

Multiple studies have reported nonunion rates of 3% to 17% following peri-prosthetic fractures. Determining management strategies based on the available literature is difficult because existing studies are small and involve heterogeneous treatments and multiple surgeons. The purpose of this study was to describe a consecutive series of patients who presented to the authors' clinic with a periprosthetic nonunion of the lower extremity and to report the methods used to achieve limb salvage and the associated complications. Patients were included if they were indicated for surgery for a nonunion of a periprosthetic fracture of the lower extremity that had previously undergone either closed or open intervention. A total of 26 patients were included in this study. Average follow-up was 58 months. Average age was 69 years, and 77% of the patients were female. Twenty-three patients had periprosthetic nonunions of the femur, with 6 being associated with total hip arthroplasty, 15 with total knee arthroplasty, and 2 with both a total hip arthroplasty and a total knee arthroplasty. Three patients had a periprosthetic nonunion of the tibia associated with a total knee arthroplasty. Limb salvage was successful in 25 of 26 cases. This was achieved by either healing of the nonunion using exuberant fixation with prosthesis revision when necessary (n=20) or resection of the nonunion with placement of a tumor prosthesis (n=5). Four of the 26 patients (15%) incurred at least 1 complication during treatment. Exuberant fixation of the nonunion (with prosthesis revision when necessary) or nonunion resection with placement of a tumor prosthesis was successful in 96% of cases. [Orthopedics. 2020;43(4):209-214.].