title: Can Dual Mobility Cups prevent Dislocation in All Situations After Revision Total Hip Arthroplasty?
abstract: The outcome of a single design of dual mobility cup was prospectively evaluated in a continuous series of 994 revision THAs with respect to dislocation and intra-prosthetic dislocation (IPD). At a 7.3-year mean follow-up, the dislocation rate was 1.5% and the IPD rate was 0.2%. The 2 IPD occurred in acetabular-only revisions and were related to a poor head-to-neck ratio with early impingement and wear at the polyethylene mobile component chamfer. Dual mobility cups demonstrated a low dislocation rate in revision THA but did not compensate for potential perioperative technical errors. In addition, IPD did not appear to be a concern with respect to the benefit in term of instability prevention though caution is advised in acetabular-only revision associated with a poor head-to-neck ratio.
  
  
  METHODS
  Therapeutic study-Level IV.
authors.affiliation: Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France; INSERM UMR 1033, Université de Lyon, Lyon, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Wegrzyn
authors.affiliation: Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France.
authors.forename: Eloïse
authors.initials: E
authors.lastname: Tebaa
authors.affiliation: Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Jacquel
authors.affiliation: Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France.
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Carret
authors.affiliation: Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Béjui-Hugues
authors.affiliation: Department of Orthopedic Surgery-Pavillon T, Hôpital Edouard Herriot, Lyon, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Pibarot
mesh_terms: D000077:Acetabulum / Q000601:surgery; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D006617:Hip Dislocation / Q000517:prevention & control* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016059:Range of Motion, Articular; D012086:Reoperation / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D020959:Polyethylene
keywords: dislocation; dual mobility cup; intra-prosthetic dislocation; revision; total hip arthroplasty