In an 89-year-old female with a displaced intracapsular fracture of the right proximal femur scheduled for bipolar hemiarthroplasty, what does the procedure involve and what are the recommended postoperative management steps?

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Bipolar Hip Hemiarthroplasty for Displaced Proximal Femur Fracture

For your 89-year-old patient with a displaced proximal femur fracture, bipolar hemiarthroplasty is the replacement of the femoral head and neck with a prosthetic implant that has two articulating surfaces—one between the inner head and outer shell, and another between the outer shell and the native acetabulum—and you should use a cemented femoral stem with surgery performed within 24-48 hours of admission. 1

What the Procedure Involves

Bipolar hemiarthroplasty replaces only the femoral side of the hip joint, leaving the acetabulum intact. The prosthesis consists of:

  • A femoral stem inserted into the femur
  • An inner femoral head that articulates within an outer polyethylene shell
  • The outer shell that moves against the patient's natural acetabulum

The dual-bearing design theoretically reduces acetabular wear compared to unipolar designs, though evidence shows both may be equally beneficial. 1

Surgical Specifications Based on Guidelines

Use a cemented femoral stem (strong evidence, strong recommendation) 1. The choice between unipolar versus bipolar is equivalent in terms of outcomes 1, though bipolar is commonly selected for more active patients.

Either anterolateral or posterior approach is acceptable—no preferred approach exists based on current evidence 1. Recent data from 1001 patients shows the posterior approach remains viable even in high-risk patients, with only 1.5% dislocation rate requiring revision 2.

Administer tranexamic acid at the start of surgery to reduce blood loss and transfusion requirements (strong evidence, strong recommendation) 1.

Either spinal or general anesthesia is appropriate 1.

Postoperative Management Algorithm

Immediate Postoperative Period (0-48 hours)

Allow full weight-bearing mobilization within the first 48 hours postoperatively 1, 3. This is critical—early mobilization significantly decreases complications from prolonged immobilization 4.

Provide interdisciplinary care through an orthogeriatrics team (strong evidence, strong recommendation) to decrease complications and improve outcomes 1. This should include:

  • Hospitalist or geriatrician involvement
  • Physical therapy consultation
  • Pain management
  • Delirium prevention protocols

Key Monitoring Points

Watch for postoperative delirium—this is an independent predictor of higher mortality (adjusted HR 1.29) 2. Implement delirium prevention strategies immediately.

Monitor for early complications:

  • Dislocation (1.5% rate) 2
  • Periprosthetic fracture (0.5% rate) 2
  • Infection (1.7% rate) 2

Mobilization Protocol

  • Day 1-2: Begin full weight-bearing with walker assistance 3, 4
  • Average mobilization time: 4 days to independent walking with assistive device 4
  • Week 6: Many patients can ambulate without walker 5

Expected Functional Outcomes

Based on the Harris Hip Score trajectory from a prospective study 4:

  • 1 month: Score ~42 (poor function)
  • 3 months: Score ~64 (fair function)
  • 6 months: Score ~82 (good function)
  • 12 months: Score ~84 (good function)

Approximately 73% of patients achieve good results at one year 4.

Critical Caveats and Pitfalls

Age matters significantly: Patients over 80 years have higher mortality (adjusted HR 1.86) and those with ASA III-IV have even higher mortality (adjusted HR 2.11) 2. The 4-year mortality rate is 51% in this population 2, so realistic goals of care discussions are essential.

Pre-fracture mobility predicts outcomes: Patients who could walk 1 mile before fracture regain pre-fracture mobility significantly better than those who could only walk 500 yards 6. Set expectations accordingly.

Timing is crucial: Surgery should occur between 24-48 hours after admission (moderate evidence, moderate recommendation) 1. However, timing (day versus night surgery) does not affect revision rates 2, so don't delay for scheduling convenience alone.

Acetabular erosion risk: While rare (0.3% requiring revision) 2, this is a long-term concern unique to hemiarthroplasty. For very active patients, total hip replacement provides better function at one year without increasing complications 7, but at 89 years old with typical comorbidities, hemiarthroplasty remains appropriate.

Revision rate is low: Only 3.9% require revision surgery within 4 years 2, making this a durable solution for elderly patients.

Hospital Discharge Planning

Average hospital stay: 12-15 days 8, 4

Discharge requirements:

  • Mobilizing with walker or assistive device
  • Adequate pain control (expect no pain or mild pain in 90% of patients by 6 months) 8
  • Home safety assessment completed
  • Outpatient physical therapy arranged
  • Follow-up scheduled at 1,3,6, and 12 months

References

1
Guideline

aaos management of hip fractures in older adults evidence-based clinical practice guideline.

The Journal of the American Academy of Orthopaedic Surgeons, 2022

3
Research

Early clinical results of cementless, bipolar hemiarthroplasty in intracapsular femur neck fractures.

Eklem hastaliklari ve cerrahisi = Joint diseases & related surgery, 2011

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