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Both groups had the same cementless acetabular component and the same articulation, which consisted of a conventional polyethylene liner and a 28 mm alumina head. The mean follow-up was 14.5 years (13 to 15), at which point there were significant differences in the mean total Harris hip score (modular\/non-modular: 98.6 (64 to 100)\/93.8 (68 to 100)), the mean range of abduction (32\u00b0 (15\u00b0 to 40\u00b0)\/28 (0\u00b0 to 40\u00b0)), use of a 10\u00b0 elevated liner (31%\/100%), the incidence of osteolysis (27%\/79.7%) and the incidence of equal leg lengths (\u2265 6 mm, 92%\/61%). There was no disassociation or fracture of the modular neck. <\/jats:p><jats:p> The modular system reduces the need for an elevated liner, thereby reducing the incidence of osteolysis. 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