TY - JOUR
T1 - Orientation and wear of the acetabular component in third generation alumina-on-alumina ceramic bearings
T2 - an analysis of 33 retrievals
AU - Lusty, P. J.
AU - Watson, A.
AU - Tuke, M. A.
AU - Walter, W. L.
AU - Walter, W. K.
AU - Zicat, B.
N1 - Corrigendum can be found in Journal of Bone and Joint Surgery - Series B, Volume 90(4), 543, http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.01.022
PY - 2007/9
Y1 - 2007/9
N2 - We studied 33 third generation, alumina ceramic-on-ceramic bearings retrieved from cementless total hip replacements after more than six months in situ. Wear volume was measured with a Roundtest machine, and acetabular orientation from the anteroposterior pelvic radiograph. The overall median early wear rate was 0.1 mm3/yr for the femoral heads, and 0.04 mm 3/yr for the acetabular liners. We then excluded hips where the components had migrated. In this stable subgroup of 22 bearings, those with an acetabular anteversion of < 15° (seven femoral heads) had a median femoral head wear rate of 1.2 mm3/yr, compared with 0 mm 3/yr for those with an anteversion of ≥ 15° (15 femoral heads, p < 0.001). Even under edge loading, wear volumes with ceramic-on-ceramic bearings are small in comparison to other bearing materials. Low acetabular anteversion is associated with greater wear.
AB - We studied 33 third generation, alumina ceramic-on-ceramic bearings retrieved from cementless total hip replacements after more than six months in situ. Wear volume was measured with a Roundtest machine, and acetabular orientation from the anteroposterior pelvic radiograph. The overall median early wear rate was 0.1 mm3/yr for the femoral heads, and 0.04 mm 3/yr for the acetabular liners. We then excluded hips where the components had migrated. In this stable subgroup of 22 bearings, those with an acetabular anteversion of < 15° (seven femoral heads) had a median femoral head wear rate of 1.2 mm3/yr, compared with 0 mm 3/yr for those with an anteversion of ≥ 15° (15 femoral heads, p < 0.001). Even under edge loading, wear volumes with ceramic-on-ceramic bearings are small in comparison to other bearing materials. Low acetabular anteversion is associated with greater wear.
UR - http://www.scopus.com/inward/record.url?scp=35848961039&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/record.url?scp=42149125522&partnerID=8YFLogxK
U2 - 10.1302/0301-620X.89B9.19282
DO - 10.1302/0301-620X.89B9.19282
M3 - Article
C2 - 17905951
AN - SCOPUS:35848961039
SN - 0301-620X
VL - 89
SP - 1158
EP - 1164
JO - Journal of Bone and Joint Surgery - Series B
JF - Journal of Bone and Joint Surgery - Series B
IS - 9
ER -