A comparison between gravimetric and volumetric techniques of wear measurement of UHMWPE acetabular cups against zirconia and cobalt-chromium-molybdenum femoral heads in a hip simulator
Sl. Smith et A. Unsworth, A comparison between gravimetric and volumetric techniques of wear measurement of UHMWPE acetabular cups against zirconia and cobalt-chromium-molybdenum femoral heads in a hip simulator, P I MEC E H, 213(H6), 1999, pp. 475-483
Citations number
29
Categorie Soggetti
Mechanical Engineering
Journal title
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
Five cobalt-chromium-molybdenum (CoCrMo) and five zirconia femoral head com
ponents have been wear tested against 28 mm diameter ultra high molecular w
eight polyethylene (UHMWPE) acetabular cups for 5 million cycles in the Dur
ham hip joint wear simulator using bovine serum as a lubricant. Wear measur
ements used gravimetric and volumetric techniques and no statistically sign
ificant difference was found between the measurement methods. The wear rate
s of the acetabular cups against both femoral heads are presented for both
measurement methods. The UHMWPE acetabular cups showed a statistically sign
ificant higher linear wear rate for the first 2 million cycles than the low
er linear wear rate from 2 million cycles to the end of the test, against b
oth femoral head materials. Over the full duration of the wear test, the we
ar rates of acetabular cups articulating against zirconia femoral heads wer
e lower than against CoCrMo femoral heads. The wear rates up to 2 million c
ycles and from 2 to 5 million cycles for both femoral head materials were c
onsistent with other studies.