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RESULTS For the young patient group, the follow-up ranged from 14 to 27 years. The HHS and the Merle D'Aubigne-Postel score significantly improved from preoperatively to a mean of 94.1 (range 48-10 and 15.9 (range 9-18), respectively. Taking stem revision for aseptic loosening as an endpoint, survivorship was 96.8% at 20 years (95% confidence interval, CI 95.1-98.5). For the DDH group, the follow-up ranged from 10 to 22 years. The mean HHS increased significantly from preoperative 49 ± 22 points to the most recent follow-up examination with 86 13 points a