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Related Experiment Videos

Risk factors for bipolar hemiarthroplasty dislocation: a retrospective cohort study.

Andreas Baranowski1,2, Céline Stahn3,4, Erik Wegner3

  • 1University Medical Center of the Johannes Gutenberg University, Mainz, Germany. dr.andreas.baranowski@gmail.com.

European Journal of Orthopaedic Surgery & Traumatology : Orthopedie Traumatologie
|July 6, 2026
PubMed
Summary

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This summary is machine-generated.

Dislocation after bipolar hemiarthroplasty (BHA) for femoral-neck fractures is linked to specific radiographic measures and nighttime surgery. Pre-operative center-edge angle (CEA) evaluation and surgical timing are key to identifying at-risk patients.

Area of Science:

  • Orthopedic surgery
  • Trauma surgery
  • Geriatric orthopedics

Background:

  • Bipolar hemiarthroplasty (BHA) is a common procedure for displaced femoral-neck fractures.
  • Postoperative dislocation is a significant complication following BHA, impacting patient outcomes.
  • Identifying risk factors for dislocation is crucial for improving surgical safety and patient care.

Purpose of the Study:

  • To investigate clinical, surgical, and radiographic parameters associated with dislocation after BHA for femoral-neck fractures.
  • To identify predictive factors for postoperative dislocation in patients undergoing BHA.
  • To inform strategies for reducing dislocation rates in BHA procedures.

Main Methods:

  • Retrospective single-center cohort study of 434 patients undergoing BHA for femoral-neck fractures.
Keywords:
Bipolar hemiarthroplastyDislocationFemoral‑neck fracturesMorphological parametersRisk factors

Related Experiment Videos

  • Analysis of demographics, comorbidities, surgical approach (timing, duration), and postoperative radiographs.
  • Univariate analyses, ROC analysis, and logistic regression, including a nested case-control subanalysis.

    • Main Results:

    • Dislocation occurred in 2.5% of patients; nighttime surgery was more frequent in dislocated cases (45% vs. 20%).
    • Smaller center-edge angle (CEA ≤ 25°), larger femoral neck-shaft angle (FNSA), reduced contralateral offset, and higher bipolar head extrusion index were associated with dislocation.
    • Logistic regression identified nighttime surgery as a potential predictor, while age, sex, comorbidities, time to surgery, and operative duration were not significant.

    Conclusions:

    • Pre-operative evaluation of CEA and consideration of operative timing may help identify patients at increased risk of dislocation.
    • Nighttime surgery may be an additional predictor for dislocation following BHA.
    • Prospective trials are needed to confirm these findings and develop preventive strategies.