Abstract
Purpose
Dual mobility THA implantations are increasing. THA survival of more than 15 years is considered long-term survival based on the Charnley prosthesis, which has a median wear rate of 39 to 98 mm3/year. What is the median wear rate of dual mobility THA cups and its repartition on the liner volume? What are the factors influencing dual mobility wear?
Methods
Thirty-five explants were analysed. The liners were entirely mapped with a fully automatic stripe light scanner that uses green LED light.
Results
The liners had a median wear rate of 38 mm3/year. The distribution of the wear between the two bearings varied greatly. No factor was found influencing wear volumes.
Conclusions
The median annual wear of dual mobility liners is at least as low as the wear of cemented polyethylene liners and lower than equivalent cementless liners. The two articulations of the dual mobility THA do not cause more wear.
Level of evidence
Level IV - case series.
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Acknowledgements
We thank SERF (Décines, France) for giving us complete data on the implants used in this study (blueprints, 3D models, manufacturing tolerances).
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Bertrand Boyer and Thomas Neri are consultants for SERF (Décines, France).
Rémi Philippot and Frédéric Farizon receive royalties from SERF (Décines, France).
Alexandre Di Iorio and Jean Geringer had no conflict of interest concerning this study.
Ethical review committee statement
As this study involves only implant retrieval, anonymously collected, the Ethical Review Committee Approval was not required for this study, according to the Ethical Review Committee from our institution.
Funding
No funding was necessary for this study.
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Boyer, B., Neri, T., Geringer, J. et al. Long-term wear of dual mobility total hip replacement cups: explant study. International Orthopaedics (SICOT) 42, 41–47 (2018). https://doi.org/10.1007/s00264-017-3525-z
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DOI: https://doi.org/10.1007/s00264-017-3525-z