Abstract
Purpose
Mid- and long-term follow-up of Charnley total hip arthroplasty (THA) demonstrated good functional results with 85 % survivorship at 25-year follow-up. However, dislocation still remains an unsolved problem. Dislocation may occur throughout the patient’s and implant’s life. The aim of this study is to answer the question: does a dual mobility cup (DMC) decrease the dislocation risk?
Methods
We report comparative results at ten years of follow-up of two groups of primary cemented Charnley-type THA, one with a standard polyethylene cup (group 1, n = 215) and the other one with a DMC (group 2, n = 105).
Results
In group 1, 26 dislocations (12.9 %) occurred. In group 2 only one dislocation (0.9 %) occurred. This dislocation was successfully reduced by closed reduction, without any recurrence. This difference was statistically significant (p = 0.0018). In group 1, the reason for revision was recurrent dislocation in 21 cases. Five patients were revised for other reasons. The global revision rate was 12.9 %. In group 2, two patients needed revision surgery for aseptic loosening. The global revision rate was 2.1 %. This difference was statistically significant (p = 0.054). The goal was reached for the patients of group 2 who had more risks factors for dislocation (age, aetiology, American Society of Anesthesiologists and Devane scores) than those of group 1.
Conclusions
When using a DMC, we observed a low rate of dislocation in primary THA (0.9 %). This surgical choice seems to be a safe and effective technique in Charnley-type THA, especially in a high-risk population.
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Disclosures
Jacques H. Caton, Jean-Louis Prudhon and André Ferreira are consultants of Groupe Lépine. Thierry Aslanian and Régis Verdier are employed by Groupe Lépine.
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Caton, J.H., Prudhon, J.L., Ferreira, A. et al. A comparative and retrospective study of three hundred and twenty primary Charnley type hip replacements with a minimum follow up of ten years to assess wether a dual mobility cup has a decreased dislocation risk. International Orthopaedics (SICOT) 38, 1125–1129 (2014). https://doi.org/10.1007/s00264-014-2313-2
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DOI: https://doi.org/10.1007/s00264-014-2313-2