36 patients who had undergone total hip arthroplasty and completed a 2-year follow-up of a previous randomized controlled trial were invited and included in this follow-up extension. Patients had received a press-fit, all-polyethylene acetabular cup, and had been randomized to placement with or without additional screw fixation. Radiostereometric analysis was performed to assess component migration and wear over 6.5-year follow-up, and the Harris Hip Score and Oxford Hip Score were used to assess clinical outcome. No significant differences were observed between groups in total 3-dimensional translation or rotation of the acetabular component. There were also no significant differences between groups in the total overall and corrected 3-dimensional wear or overall & corrected wear rates.