Equivalent wear performance of dual mobility bearing compared with standard bearing in total hip arthroplasty: in vitro study

Purpose Osteolysis in total hip arthroplasty (THA) depends on polyethylene wear and dictates the survival of the prosthesis. Dual mobility in THAs, which is claimed to reduce dislocation risk, has very good long-term clinical results. However, little is known about how the liner wears in this design...

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Veröffentlicht in:International orthopaedics 2017-03, Vol.41 (3), p.521-527
Hauptverfasser: Gaudin, Gaël, Ferreira, André, Gaillard, Romain, Prudhon, Jean Louis, Caton, Jacques H., Lustig, Sébastien
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container_end_page 527
container_issue 3
container_start_page 521
container_title International orthopaedics
container_volume 41
creator Gaudin, Gaël
Ferreira, André
Gaillard, Romain
Prudhon, Jean Louis
Caton, Jacques H.
Lustig, Sébastien
description Purpose Osteolysis in total hip arthroplasty (THA) depends on polyethylene wear and dictates the survival of the prosthesis. Dual mobility in THAs, which is claimed to reduce dislocation risk, has very good long-term clinical results. However, little is known about how the liner wears in this design, compared to the standard single mobility model. Methods A comparative study looking at wear of a conventional ultra-high-molecular-weight polyethylene liner, using gravimetric measurement, between dual mobility implants and standard implants, was performed on a simulator in accordance with a normed protocol based on the same dimensions, environmental conditions and stresses. A linear regression test was employed. Results Under the same conditions (loading, cycles, sterilization, material and surface roughness), the gravimetric wear (for conventional polyethylene) is comparable between a standard and a dual mobility cup. This correlates to ten year follow-up results of dual mobility cup. Discussion - Conclusion This in vitro equivalent wear serves to confirm the very good long-term clinical results observed with dual mobility bearing, whose use should not be restricted by concerns about increased polyethylene wear.
doi_str_mv 10.1007/s00264-016-3346-5
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Dual mobility in THAs, which is claimed to reduce dislocation risk, has very good long-term clinical results. However, little is known about how the liner wears in this design, compared to the standard single mobility model. Methods A comparative study looking at wear of a conventional ultra-high-molecular-weight polyethylene liner, using gravimetric measurement, between dual mobility implants and standard implants, was performed on a simulator in accordance with a normed protocol based on the same dimensions, environmental conditions and stresses. A linear regression test was employed. Results Under the same conditions (loading, cycles, sterilization, material and surface roughness), the gravimetric wear (for conventional polyethylene) is comparable between a standard and a dual mobility cup. This correlates to ten year follow-up results of dual mobility cup. 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Dual mobility in THAs, which is claimed to reduce dislocation risk, has very good long-term clinical results. However, little is known about how the liner wears in this design, compared to the standard single mobility model. Methods A comparative study looking at wear of a conventional ultra-high-molecular-weight polyethylene liner, using gravimetric measurement, between dual mobility implants and standard implants, was performed on a simulator in accordance with a normed protocol based on the same dimensions, environmental conditions and stresses. A linear regression test was employed. Results Under the same conditions (loading, cycles, sterilization, material and surface roughness), the gravimetric wear (for conventional polyethylene) is comparable between a standard and a dual mobility cup. This correlates to ten year follow-up results of dual mobility cup. 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subjects Arthroplasty, Replacement, Hip - adverse effects
Biomechanical Phenomena
Biomechanics
Engineering Sciences
Hip Prosthesis - adverse effects
Humans
In Vitro Techniques
Linear Models
Mechanics
Medicine
Medicine & Public Health
Original Paper
Orthopedics
Polyethylenes - adverse effects
Polyethylenes - analysis
Prospective Studies
Prosthesis Design - adverse effects
Prosthesis Design - methods
Prosthesis Failure - etiology
title Equivalent wear performance of dual mobility bearing compared with standard bearing in total hip arthroplasty: in vitro study
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