Based on positive clinical experience with the taper lock of ceramic heads in total hip replacement, the conical fixation was also chosen for modular cup inlay made of alumina ceramic and polyethylene. For a comparative assessment of inlay fixation, new ceramic and polyethylene inlays with a taper lock were biomachanically tested and compared with clinically proven system with a snap lock mechanism. With regard to the prevention of dislocation and relative movements the same level of safety was found. Measurements of the damping characteristic of the acetabulum replacement showed that there is no considerable shock-absorption for a metal backed polyethylene inlay and there are no differences in this respect between ceramic and polyethylene inlays.
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