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The Journal of Bone and Joint Surgery, Vol 57, Issue 2 226-230, Copyright © 1975 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

"Stiction-friction" of total hip prostheses and its relationship to loosening

SR Simon, IL Paul, RM Rose and EL Radin

The static friction, or "stiction-friction", in McKee-Farrar and Charnley-Muller prostheses in a hip joint simulator was compared with dynamic friction determined while the prostheses were oscillated. Under physiological conditions stiction-friction differed little from dynamic friction in both metal-on-metal and metal-on-plastic prostheses, and was affected very little by the lubricant as long as some fluid was present. Stiction-friction increased significantly only after relatively long stationary periods and high loads. However, the frictional forces generated in total hip-replacement prostheses were at least forty times higher than those generated in normal joints and may well be enough to cause late loosening of acetabular components by fatigue failure.
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