A PROSPECTIVE STUDY ON 321 PERIPROSTHETIC FEMUR FRACTURES REPORTED TO THE SWEDISH NATIONAL TOTAL HIP ARTHROPLASTY REGISTER.

Abstract

INTRODUCTION: The postoperative periprosthetic femoral fracture is a severe complication after total hip surgery. It has become the third most common reason for revision. Three-hundred and twenty one fractures operated during 1999–2000, were followed in a prospective nationwide study. The study focused on the failure rate, patient satisfaction, treatment and radiographic evaluation.

PATIENTS AND METHODS: During 1999–2000, 230 fractures after a primary THR and 91 after a revision THR were reported to the Swedish National Hip Arthroplasty Register. All hospital records were collected. At follow-up the Harris hip score, a health-related quality of life measure (EQ-5D) and patient satisfaction were used as outcome measurement. A radiologist performed the radiographic evaluation.

RESULTS: A high number of patients had a loose implant at fracture time (66% in the primary group and 51% in the revision group). Eighty-eight percent of the fractures were classified as Vancouver type B fractures. A major finding was the association between the type of implant and the risk of a periprosthetic fracture. The Charnley and the Exeter prostheses were significantly over represented among patients with fractures and the Lubinus prosthesis significantly under represented. The surgeons grading of the Vancouver type B1 fracture was not in agreement with the study radiologist in more than 34% of the cases. Patient’s satisfaction concerning mobility, self-care, normal activities, pain and anxiety compared to an age matched population with a THR were poor. There was a high failure rate and by December 31, 2004, 22% had been reoperated.

DISCUSSION: A recommendation is to follow all THR patients with regularly radiographic monitoring and to intervene before the fracture. Implant related factors have to be considered when choosing implant for routine use. Difficulty in evaluating the x-rays concerning the stability of the prostheses might lead to sub optimal treatment. We recommend exploration of the implant for all patients with a Vancouver type B fracture if there is any doubt about the fixation status.