Hip dislocation after modular unipolar hemiarthroplasty

J Arthroplasty. 2009 Aug;24(5):768-74. doi: 10.1016/j.arth.2008.02.019. Epub 2008 Jun 13.

Abstract

An institutional review board-approved retrospective review of hip fractures in elderly patients treated with a modular unipolar implant was carried out to identify factors predisposing to dislocation of a hemiarthroplasty. The main outcome measure evaluated was dislocation vs nondislocation. Two hundred seventeen patients underwent the surgery, and 174 were available for review at 6 weeks and 144 at 1 year. The incidence of dislocation was 6%. The average time of dislocation after surgery was 19.3 days. Clinical factors significant for dislocation were male sex and mental disease. Radiographic factors in dislocated hips included a smaller femoral neck and contralateral femoral neck offset. The center edge angle was also smaller in the dislocated patients. These patients had a higher mortality rate.

MeSH terms

  • Aged
  • Aged, 80 and over
  • Arthroplasty, Replacement, Hip / adverse effects*
  • Female
  • Femoral Neck Fractures / surgery*
  • Hip Dislocation / diagnostic imaging*
  • Hip Dislocation / etiology
  • Humans
  • Male
  • Middle Aged
  • Prosthesis Design
  • Prosthesis Failure
  • Radiography
  • Retrospective Studies