Abstract
Introduction and Aims: Differing methods of cup fixation in total hip replacement are recommended. This prospective randomised study aims to show whether one method is superior to another.
Method: A prospective randomised double blind study was started in 1995, with Ethics Committee approval. Four different methods of cup fixation were used viz. a cemented Ogee cup, a press fit metal-backed cup with pegs, a press fit cup without pegs and a truncated screw in cup. Patient selection was confined to unilateral osteoarthritis of the hip and all other components used were standard viz cemented Elite Plus stem, 28mm ceramic head and Enduron polyethylene.
Results: One hundred and thirty-nine patients have been entered into the study, 23 were lost to follow-up leaving 116 for analysis. The cups have been radiologically assessed for acetabular orientation and the presence or absence of radiolucent lines or acetabular loosening. Follow-up ranges between one and nine years, and as the study is ongoing, updated data will be presented. Currently there are radiolucent lines appearing in zones 1, 2 and 3 of the Ogee cups, but none in the metal-backed cups. To date no cup has come loose.
Conclusion: Early results show that no method of cup fixation is superior to the other, although the radiolucent lines with the Ogee cups (cemented cups) is a cause for concern in the future.
These abstracts were prepared by Editorial Secretary, George Sikorski. Correspondence should be addressed to Australian Orthopaedic Association, Ground Floor, The William Bland Centre, 229 Macquarie Street, Sydney, NSW 2000, Australia.
At least one of the authors is receiving or has received material benefits or support from a commercial source.
