Background:Constrained acetabular components have been used to treat hips that experience recurrent or intra-operative instability after a total hip replacement. We previously reported the results of cementing tripolar constrained acetabular liners into secure, well-positioned acetabular shells in patients with preoperative or intraoperative hip instability at an average 3.9 years of follow-up. In this study, we report the results at an average of 15.4 years of follow-up to determine the long-term durability of the construct.
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