Early Results of Total Cementless Hip Joint Arthroplasty with the Anatomical Stem.

BACKGROUND

The aim of this study is to present the early results of hip joint arthroplasty with the EXCEPTION anatomical stem (BIOMET).

MATERIALS AND METHODS

The study enrolled 173 patients (110 women and 63 men) who underwent a total of 190 hip joint arthroplasties with the EXCEPTION anatomical stem. The mean age of the patients at surgery was 58.2 years (range: 28-82 years). The mean follow-up period was 7.3 years (range: 5-10.1 years).

RESULTS

Pre-operative Merle d'Aubigne-Postel scores (modified by Charnley) of the study group were poor in all patients. Mean post-operative improvement was 6.7 points. The outcomes were classified as excellent in 131 cases, good in 39, satisfactory in 13 and poor in 7 cases. Poor results were always associated with implant loosening. Heterotopic ossification was noted in 14 cases (7.4%). According to the Kaplan-Meier estimator, 5 years' survival probability was 96.31% for the whole implant and 99.47% for the stem alone.

CONCLUSIONS

1. Our follow-up data (from a mean follow-up period of more than 7 years) indicate that the EXCEPTION anatomical stem affords excellent clinical and functional results. 2. With good surgical technique and in the absence of complications, the risk of aseptic loosening is minimal. 3. Due to the relatively short duration of follow-up, there may be more cases of loosening (mainly of the acetabular cup) over time, requiring regular long-term follow-up.