Evaluation of a hip joint simulator.
To evaluate the functioning of the Durham hip joint wear simulator, the wear rates of ultra high molecular weight polyethylene (UHMWPE) and polytetrafluoroethylene (PTFE) acetabular cups articulating against 22 mm diameter cobalt-chromium-molybdenum (CoCrMo) femoral heads were studied. A wear test was conducted in a lubricant of distilled water at 37 degrees C for a duration of 4.8 million cycles. The average penetration rate for the CoCrMo femoral heads against UHMWPE acetabular cups was 0.03 mm/10(6) cycles, while penetration rate for PTFE cups was some twenty times greater. These results are of a similar order of magnitude to other simulator studies in distilled water and are in a similar ratio to clinical data.
Smith
S L
SL
Centre for Biomedical Engineering, University of Durham, UK.
Burgess
I C
IC
Unsworth
A
A
D000077:Acetabulum; D001696:Biomechanical Phenomena; D005270:Femur Head; D006621:Hip Joint / Q000502:physiology; D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing; D011095:Polyethylenes; D011138:Polytetrafluoroethylene; D011474:Prosthesis Design; D017755:Prosthesis Fitting; D014800:Vitallium
D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D014800:Vitallium; D011138:Polytetrafluoroethylene