title: Case report: Painless chronic liner dissociation of a total hip arthroplasty.
abstract: BACKGROUND
  Dislocation or liner dissociation of a total hip prosthesis usually results in pain and discomfort. Although several reports describe chronic dislocation and its treatment, chronic liner dissociation is an unreported complication.
  
  
  METHODS
  We report an unrecognized dissociation and displacement of the liner of a total hip prosthesis after revision THA. The patient had virtually no pain or functional restrictions. The patient's only complaint was pain on the contralateral side, associated with a leg-length discrepancy. Since the patient had no complaints relative to the liner dissociation we elected not to pursue further treatment. The contralateral pain was treated successfully with a shoe lift.
  
  
  METHODS
  Chronic dislocation of a THA is a rare complication and we found reports of only seven cases in the literature. We found no reports of chronic liner dissociation.
  
  
  CONCLUSIONS
  Orthopaedic surgeons should be aware of the possibility of this rare complication. Our case and the literature suggest treatment can be nonsurgical or surgical.
authors: Department of Orthopedics, Spaarne Hospital, Spaarne Ziekenhuis, Spaarnepoort 1, 2134 TM, Hoofddorp, the Netherlands. jmnellensteijn@hotmail.com
authors: Jorm M
authors: JM
authors: Nellensteijn
authors: David R
authors: DR
authors: Nellensteijn
authors: Tjitte
authors: T
authors: De Jong
mesh_terms: D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D002908:Chronic Disease; D005260:Female; D006617:Hip Dislocation / Q000209:etiology*; D006621:Hip Joint; D006801:Humans; D011475:Prosthesis Failure / Q000209:etiology*; D016059:Range of Motion, Articular; D012086:Reoperation