Survival analysis at 10 years of a cohort of 297 atlas total hip prostheses

Abstract

The purpose of this work is to study the survival curve of Atlas hip prostheses (acetabular insert) implanted by a single surgeon and with a minimum follow-up period of 10 years. Between January 1989 and December 1995, 297 ATLAS cups have been implanted at the Clinic Saint Andre in Reims, 171 ATLAS II non coated with hydroxyapatite and 126 ATLAS III which had a hydroxyapatite coating. Non-parametric survival curves have been calculated using the actuarial method. The survival rate of the global series of 297 cups ATLAS (coated or non coated with hydroxyapatite) only considering the revisions in relation to the acetabulum (polyethylen wear, malpositions...) was of 90% at 10 years and of 85.5% at 15 years. It was more satisfactory for the ATLAS III cups with a hydroxyapatite coating: 92.3% at 10 years and 88.4% at 14 years; which result confirms the merits of a surface treatment of the external wall. The revision rate for polyethylen wear was lower (3%). At a maximum follow-up time of 17 years, not any mobilization of the insert in the cup or any case of metallosis was reported.