Long-term results of the threaded Weill cup in primary total hip arthroplasty |
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Authors: | Michael Clarius Alexander W Jung Patric Raiss Marcus R Streit Christian Merle Peter R Aldinger |
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Institution: | Stiftung Orthopädische Universitätsklinik Heidelberg, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany |
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Abstract: | Uncemented, threaded acetabular components with smooth surface treatment were widely used in continental Europe in the 1970s
and 1980s for primary total hip arthroplasty (THA). Previously published studies showed high failure rates in the mid-term.
In a consecutive series of 116 patients, 127 threaded cups with smooth surface treatment (Weill cup; Zimmer, Winterthur, Switzerland)
were implanted in combination with one type of uncemented stem. Patients were followed up clinically and radiographically.
Mean time of follow-up was 17 years (range 15–20). At the time of follow-up, the acetabular component had been revised or
was awaiting revision in 30 hips (24%). Two hips were revised for infection and 23 for aseptic loosening. Four polyethylene
liners were exchanged because of excessive wear. One hip was awaiting revision. The survival rate for all acetabular revisions
including one hip awaiting revision was 75% (95%CI: 65–85%) at 17 years. These results support the view that smooth, threaded
acetabular components do not provide satisfactory long-term fixation and should be abandoned. It is important to closely monitor
patients with these components as the failure rate remains high in the long-term. |
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