Relevance of a press-fit dual mobility cup to deal with recurrent dislocation of conventional total hip arthroplasty: a 29-case series.

UNLABELLED: The aim of this paper was to assess the impact on stability of revision of 29 standard acetabular cups to press-fit uncemented dual mobility (DM) cups in THAs with recurrent dislocation. This series was composed of 17 women and 12 men aged on average 75.6 ± 8.1 years (55-88), operated on between November 2000 and July 2010. The average number of dislocations before revision surgery was 3.87 ± 1.79 (2-10), and the average time from primary procedure to revision was 6.6 ± 4.3 years (45-15 years). 9 patients (31.03 %) had already undergone one or more procedures for instability prior to revision to DM cup. All patients were reviewed at an average time of 46 ± 28 months (range: 17 months-11 years). Only one patient had redislocated in this time (3.4 %). This patient underwent a simple closed reduction and did not dislocate again. LEVEL OF EVIDENCE: IV retrospective cohort study.