Orientation and wear of the acetabular component in third generation alumina-on-alumina ceramic bearings: an analysis of 33 retrievals

P. J. Lusty, A. Watson, M. A. Tuke, W. L. Walter, W. K. Walter, B. Zicat

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1158-1164
Number of pages7
JournalJournal of Bone and Joint Surgery - Series B
Volume89
Issue number9
DOIs
Publication statusPublished - Sep 2007
Externally publishedYes

Bibliographical note

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

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