Fig. 1.

Kaplan–Meier survivorship of the five resurfacing designs used by the senior author since 1975. Although the follow-up time of the recent designs is limited, the improvement over time is substantial. For the Conserve®Plus design, the effects of the second generation surgical changes were essentially felt on hips with risk factors (femoral component size ≤46 mm and/or femoral head defects >1 cm) because the 10-year survivorship of hip without these risk factors has been 99.7%, even with the early surgical technique