Clinical Orthopaedics and Related Research®

, Volume 470, Issue 4, pp 1158–1164

Is the Dislocation Rate Higher after Bipolar Hemiarthroplasty in Patients with Neuromuscular Diseases?

  • Kuen Tak Suh
  • Dae Woong Kim
  • Hong Seok Lee
  • Yoon Jae Seong
  • Jung Sub Lee
Clinical Research



Patients with neuromuscular disease reportedly have a higher incidence of postoperative dislocation after bipolar hemiarthroplasty. Although the literature has focused on a high prevalence of preoperative neurologic conditions in patients who had dislocations after bipolar hemiarthroplasties, the relative incidence of dislocation in patients with neuromuscular disease and without is unclear.


We therefore (1) asked whether the incidence of postoperative dislocation after bipolar hemiarthroplasty was greater in patients with neuromuscular disease than for those without, and (2) whether function differed between the two groups, and (3) explored potential risk factors for dislocation in two groups.


We retrospectively reviewed 190 patients who underwent bipolar hemiarthroplasties for fracture of the femoral neck between 1996 and 2008. Of the 190 patients, 42 had various neuromuscular diseases and 148 had no history of neuromuscular disease. Intraoperative stability was tested and posterior soft tissue repair was performed in all patients. We determined the incidence of dislocation, postoperative leg length discrepancy, and femoral offset in patients with or without neuromuscular disease.


The incidence of dislocation was 2.6% in all patients. We observed similar rates of dislocation in the two groups: 4.8% (two of 42 hips) in patients with neuromuscular disease and 2.0% (three of 148 hips) in patients without neuromuscular disease.


In femoral neck fractures in patients with neuromuscular disease, careful preoperative management and operative technique such as a posterior soft tissue repair might decrease the risk of postoperative dislocation; therefore, we consider the bipolar hemiarthroplasty a reasonable treatment option.

Level of Evidence

Level III, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.


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Copyright information

© The Association of Bone and Joint Surgeons® 2011

Authors and Affiliations

  • Kuen Tak Suh
    • 1
  • Dae Woong Kim
    • 1
  • Hong Seok Lee
    • 1
  • Yoon Jae Seong
    • 1
  • Jung Sub Lee
    • 1
  1. 1.Department of Orthopaedic SurgeryPusan National University School of MedicineYangsanKorea

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