title: Dual mobility cup reduces dislocation rate after arthroplasty for femoral neck fracture.
abstract: BACKGROUND
  Hip dislocation after arthroplasty for femoral neck fractures remains a serious complication. The aim of our study was to investigate the dislocation rate in acute femoral neck fracture patients operated with a posterior approach with cemented conventional or dual articulation acetabular components.
  
  
  METHODS
  We compared the dislocation rate in 56 consecutive patients operated with conventional (single mobility) cemented acetabular components to that in 42 consecutive patients operated with dual articulation acetabular components. All the patients were operated via posterior approach and were followed up to one year postoperatively.
  
  
  RESULTS
  There were 8 dislocations in the 56 patients having conventional components as compared to no dislocations in those 42 having dual articulation components (p = 0.01). The groups were similar with respect to age and gender distribution.
  
  
  CONCLUSIONS
  We conclude that the use of a cemented dual articulation acetabular component significantly reduces the dislocation rates in femoral neck fracture patients operated via posterior approach.
authors.affiliation: Department of Orthopedics, Lund University Hospital, Getingevagen 4, Lund, Sweden. sarunas.tarasevicius@med.lu.se
authors.forename: Sarunas
authors.initials: S
authors.lastname: Tarasevicius
authors.forename: Mantas
authors.initials: M
authors.lastname: Busevicius
authors.forename: Otto
authors.initials: O
authors.lastname: Robertsson
authors.forename: Hans
authors.initials: H
authors.lastname: Wingstrand
mesh_terms: D000077:Acetabulum / Q000503:physiopathology / Q000601:surgery; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000295:instrumentation* / Q000379:methods; D019544:Equipment Failure Analysis / Q000379:methods; D005260:Female; D005265:Femoral Neck Fractures / Q000601:surgery*; D005500:Follow-Up Studies; D006621:Hip Joint / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D006622:Hip Prosthesis / Q000009:adverse effects / Q000592:standards; D006801:Humans; D004204:Joint Dislocations / Q000209:etiology* / Q000503:physiopathology / Q000517:prevention & control; D008097:Lithuania / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology / Q000503:physiopathology / Q000517:prevention & control; D011474:Prosthesis Design / Q000379:methods*; D011475:Prosthesis Failure; D019919:Prosthesis Implantation / Q000379:methods; D016059:Range of Motion, Articular / Q000502:physiology; D013997:Time Factors