title: Understanding wear in dual mobility total hip replacement: first generation explant wear patterns.
abstract: Dual mobility was introduced by Pr. G. Bousquet to improve the dislocation risk of total hip arthroplasty (THR). The wear mechanisms of this implant remain to be understood. Could enhanced explant wear analysis explain liner wear behaviour?
  
  
  
  Sixty-six explanted liners were selected. Non-destructive 3D scanning and heat colour treatment allowed reporting wear patterns on both convex and concave sides of the liners.
  
  
  
  For many liners, liner convexity wear was found to be homogeneous, and linked to a longer implantation time. A few liners had signs of blocking of the convexity, leading to excessive internal damage. Intra prosthetic dislocations were found to only have internal circular wear without liner penetration.
  
  
  
  Heat colour treatment showed its effectiveness for highlighting wear patterns. Optimal convexity mobility seemed to be leading to a longer implantation time, with decreased contact stresses on concavity. The retentive rim should have a distinct wear analysis.
authors.affiliation: Mines de Saint-Etienne, Unité SAINBIOSE, INSERM U1059, Université de Lyon-St Etienne, Lyon, France. bertrand.boyer@chu-st-etienne.fr.|Laboratoire de Physiologie de l'Exercice, Faculté de Médecine J. Lisfranc, Université Jean Monnet, 42055, Cedex 2, France. bertrand.boyer@chu-st-etienne.fr.
authors.forename: Bertrand
authors.identifier: 0000-0001-6427-9491
authors.initials: B
authors.lastname: Boyer
authors.affiliation: Laboratoire de Physiologie de l'Exercice, Faculté de Médecine J. Lisfranc, Université Jean Monnet, 42055, Cedex 2, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Neri
authors.affiliation: Mines de Saint-Etienne, Unité SAINBIOSE, INSERM U1059, Université de Lyon-St Etienne, Lyon, France.
authors.forename: Jean
authors.initials: J
authors.lastname: Geringer
authors.affiliation: Laboratoire de Physiologie de l'Exercice, Faculté de Médecine J. Lisfranc, Université Jean Monnet, 42055, Cedex 2, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Di Iorio
authors.affiliation: Laboratoire de Physiologie de l'Exercice, Faculté de Médecine J. Lisfranc, Université Jean Monnet, 42055, Cedex 2, France.
authors.forename: Remi
authors.initials: R
authors.lastname: Philippot
authors.affiliation: Laboratoire de Physiologie de l'Exercice, Faculté de Médecine J. Lisfranc, Université Jean Monnet, 42055, Cedex 2, France.
authors.forename: Frederic
authors.initials: F
authors.lastname: Farizon
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D004204:Joint Dislocations; D008297:Male; D011474:Prosthesis Design / Q000009:adverse effects*; D011475:Prosthesis Failure / Q000209:etiology*; D036301:Qualitative Research
keywords: Dual mobility; Implant retrieval; THR; Wear; Wear patterns