Acetabular reconstruction with the Kerboull-type plate at mid-term follow-up: survivorship analysis and prognostic factors for loosening.

INTRODUCTION

Successful reconstruction during total hip arthroplasty for acetabular bone defects remains challenging. The purpose of our study was to evaluate clinical and radiographic results and performed a survivorship analysis for patients with acetabular bone loss undergoing total hip arthroplasty (THA) or revision THA using Kerboull-type acetabular reinforcement device(KT plate). Additionally, some independent prognostic factors for radiographic failure were identified.

METHODS

A retrospective cohort study was conducted. Thirty patients (36 hips) were available for follow-up examination between 1997 and 2012, with a mean follow-up period of 10 years. We evaluated clinical and radiographic results. The mean patient age at the time of the operation was 66 years.

RESULTS

Failure occurred in 6 cases, and further revisions were required for 2 hips. With failure for any reason as an endpoint, the cumulative survival at 10 years was 85%. Survival analysis at 10 years with failure as the endpoint revealed that the inclination angle of the KT plate ≤ 45° group showed higher survivorship than the inclination angle > 45° group (95.8 vs. 63.6%, P = 0.0047).

CONCLUSIONS

With a mean follow-up of 10 years, the clinical and radiographic outcomes were satisfactory. While this study group was small, the results suggest that prosthesis longevity may be improved by setting the inclination angle of this reinforcement device at ≤ 45°.