title: Analysis of Dual Mobility Liner Rim Damage Using Retrieved Components and Cadaver Models.
abstract: The objective of this study was to assess the retentive rim of retrieved dual mobility liners for visible evidence of deformation from femoral neck contact and to use cadaver models to determine if anterior soft tissue impingement could contribute to such deformation.
  
  
  
  Fifteen surgically retrieved polyethylene liners were assessed for evidence of rim deformation. The average time in vivo was 31.4 months, and all patients were revised for reasons other than intraprosthetic dislocation. Liner interaction with the iliopsoas was studied visually and with fluoroscopy in cadaver specimens using a dual mobility system different than the retrieval study. For fluoroscopic visualization, a metal wire was sutured to the iliopsoas and wires were also embedded into grooves on the outer surface of the liner and the inner head.
  
  
  
  All retrievals showed evidence of femoral neck contact. The cadaver experiments showed that liner motion was impeded by impingement with the iliopsoas tendon in low flexion angles. When observing the hip during maximum hyperextension, 0°, 15°, and 30° of flexion, there was noticeable tenting of the iliopsoas caused by impingement with the liner.
  
  
  
  Liner rim deformation resulting from contact with the femoral neck likely begins during early in vivo function. The presence of deformation is indicative of a mechanism inhibiting mobility of the liner. The cadaver studies showed that liner motion could be impeded because of its impingement with the iliopsoas. Such soft tissue impingement may be one mechanism by which liner motion is routinely inhibited, which can result in load transfer from the neck to the rim.
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Audrey K
authors.initials: AK
authors.lastname: Nebergall
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Freiberg
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Meridith E
authors.initials: ME
authors.lastname: Greene
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Henrik
authors.initials: H
authors.lastname: Malchau
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Orhun
authors.initials: O
authors.lastname: Muratoglu
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Shannon
authors.initials: S
authors.lastname: Rowell
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Thomas
authors.initials: T
authors.lastname: Zumbrunn
authors.affiliation: Department of Orthopaedics, Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Kartik M
authors.initials: KM
authors.lastname: Varadarajan
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D002102:Cadaver; D005260:Female; D005272:Femur Neck; D005471:Fluoroscopy; D006622:Hip Prosthesis; D006801:Humans; D004204:Joint Dislocations; D008297:Male; D008670:Metals; D008875:Middle Aged; D020959:Polyethylene / Q000737:chemistry*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016059:Range of Motion, Articular
chemical_list: D008670:Metals; D020959:Polyethylene
keywords: cadavers; dual mobility; intraprosthetic dislocation; retrievals; total hip arthroplasty