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Can Dual Mobility Cups prevent Dislocation in All Situations After Revision Total Hip Arthroplasty?
Julien Wegrzyn1, Eloïse Tebaa2, Alexandre Jacquel2
1Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France; INSERM UMR 1033, Université de Lyon, Lyon, France.
Unlabelled:
The outcome of a single design of dual mobility cup was prospectively evaluated in a continuous series of 994 revision THAs with respect to dislocation and intra-prosthetic dislocation (IPD). At a 7.3-year mean follow-up, the dislocation rate was 1.5% and the IPD rate was 0.2%. The 2 IPD occurred in acetabular-only revisions and were related to a poor head-to-neck ratio with early impingement and wear at the polyethylene mobile component chamfer. Dual mobility cups demonstrated a low dislocation rate in revision THA but did not compensate for potential perioperative technical errors. In addition, IPD did not appear to be a concern with respect to the benefit in term of instability prevention though caution is advised in acetabular-only revision associated with a poor head-to-neck ratio.
Level Of Evidence:
Therapeutic study-Level IV.
