Design rationale in early clinical trials with a hemispherical threaded acetabular component.
Ninety-eight cases of a titanium hemispherical screw cup were followed for 1-3 years (average, 2 years). To differentiate stem problems from acetabular problems, as and because the early results of the cemented stem are well known, the authors studied only those uncemented screw cups with a cemented stem. Of five cases with acetabular pain, one was definitely loose and two were probably loose and require revision. With increasing experience, the selection criteria for the use of an uncemented screw cup have become increasingly rigid; today, the loose cases would probably be handled with a bipolar implant. In most cases initial radiolucency decreased with time, and on clinical radiographs the vast majority showed no radiolucency. The overall Harris rating was 91% (excellent). The early results for this component are quite promising, but further longitudinal studies are required.
Cameron
H U
HU
Department of Surgery, University of Toronto, Ontario, Canada.
Bhimji
S
S
D000328:Adult; D000368:Aged; D005260:Female; D006621:Hip Joint / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011474:Prosthesis Design