Figure 4.

Dot chart showing the pooled 2-year proximal migration ranked by the pooled 10-year revision rate for each PF: combination of prosthesis type and fixation method. The unacceptable PFs (based on their migration pattern) have been abandoned, with the Wagner cup having the worst recorded survival in the Swedish Register (Ahnfelt et al. 1990). A detailed description of each PF is given in Table 1. R10(%) is the pooled revision rate at 10-year follow-up, in percent; NA: not available.

*This a best-case scenario for the Wagner cup, since the reference scene was not made directly postoperatively. Thus, the actual 2-year proximal migration is more than the observed value presented here.

** The Birmingham Hip Resurface (BHR) prostheses of the RSA study were implanted by the developer, so the migration results (and “acceptable” classification) may not apply to non-developers.