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Primary intention-to-treat outcomes shown with 95% confidence interval (CI) by grouped and individual intervention group: mean femoral head penetration with 95% CI into the polyethylene liner. a) Head penetration by liner material. b) Head penetration by head size. c) Head penetration according to individual intervention groups. vE-PE, vitamin E-doped cross-linked polyethylene liners; XLPE, cross-linked polyethylene liners; 32 mm, 32 mm CoCr femoral head; 36, 36 mm CoCr femoral head.
