A five-station hip joint simulator.
A five-station hip joint wear simulator was designed and built which featured simplified motion and loading. An elliptical wear path was produced using approximately sinusoidal motion in the flexion/extension and internal/external rotation axes and the dynamic loading approximated to a square wave. Five 28 mm diameter zirconia femoral heads articulated against ultra-high molecular weight polyethylene acetabular cups in 25 per cent bovine serum for 5 x 10(6) cycles. Gravimetric wear measurement was used with moisture absorption compensation using a dynamically loaded soak control. With motion of physiological magnitude, the mean acetabular cup wear rate was 52.2 mm3/10(6) cycles which is comparable with a number of clinical studies.
Smith
S L
SL
Centre for Biomedical Engineering, University of Durham, UK.
Unsworth
A
A
D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing; D009038:Motion; D015040:Zirconium
D015040:Zirconium