title: Equivalent wear performance of dual mobility bearing compared with standard bearing in total hip arthroplasty: in vitro study.
abstract: 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.
  
  
  
  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.
  
  
  
  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.
  
  
  
  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.
authors.affiliation: Centre Albert Trillat, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France.
authors.forename: Gaël
authors.initials: G
authors.lastname: Gaudin
authors.affiliation: Clinique du Parc, 155 Ter Boulevard de Stalingrad, 69006, Lyon, France.
authors.forename: André
authors.initials: A
authors.lastname: Ferreira
authors.affiliation: Centre Albert Trillat, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Gaillard
authors.affiliation: Centre Ostéo-articulaire des Cèdres, 5 rue des tropiques, 38130, Echirolles, France.
authors.forename: Jean Louis
authors.initials: JL
authors.lastname: Prudhon
authors.affiliation: Institut d'orthopédie, 103 rue Coste, 69300, Caluire et Cuire, France.
authors.forename: Jacques H
authors.initials: JH
authors.lastname: Caton
authors.affiliation: Centre Albert Trillat, Hôpital de la Croix-Rousse, 103 Grande Rue de la Croix-Rousse, 69004, Lyon, France. sebastien.lustig@gmail.com.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Lustig
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001696:Biomechanical Phenomena; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D066298:In Vitro Techniques; D016014:Linear Models; D011095:Polyethylenes / Q000009:adverse effects* / Q000032:analysis; D011446:Prospective Studies; D011474:Prosthesis Design / Q000009:adverse effects* / Q000379:methods; D011475:Prosthesis Failure / Q000209:etiology
chemical_list: D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene
keywords: Dual mobility; Hip joint simulator; Total hip arthroplasty; Wear