[Initial stability and pelvic deformation in cemented and non-cemented acetabular components].

Periacetabular surface deformation of the pelvis and micromotion between implant and bone were measured in three cementless acetabular components. Pelvic deformation was greater in cementless implants than in cemented ones-independent of the stiffness of the implant. The results of micromotion measurements confirmed the function of certain of anchorage concepts, but they also illustrated the limitations of such measurements in single locations.