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Component motion in bipolar cemented hemiarthroplasty
S Eiskjaer1, K Boll, J Gelineck
1Department of Orthopaedic Surgery, Arhus Kommunehospital, University of Arhus, Denmark.
Journal of Orthopaedic Trauma
|January 1, 1989
Summary
Bipolar hip prostheses showed minimal intraprosthetic motion in patients with femoral neck fractures. Success is likely due to patient selection, bone cement, and the polyethylene liner, not the biarticular design.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Displaced femoral neck fractures often require hip arthroplasty.
- Bipolar hemiarthroplasty is a common surgical option.
- Understanding prosthetic motion is crucial for long-term outcomes.
Purpose of the Study:
- To evaluate intraprosthetic motion in cemented bipolar Hastings hemiarthroplasty.
- To correlate intraprosthetic motion with functional outcomes.
- To identify factors contributing to the short-term success of this prosthesis.
Main Methods:
- Clinical and radiological examination of 17 patients 1-3 years post-surgery.
- Assessment of weightbearing intraprosthetic motion.
- Analysis of correlation between motion and functional results.
Main Results:
- Minor intraprosthetic motion observed; often absent or due to impingement.
- Intraprosthetic motion did not decrease with weightbearing.
- No correlation found between intraprosthetic motion and functional outcomes.
Conclusions:
- Short-term success of bipolar prostheses is likely multifactorial.
- Factors include patient selection (elderly, low activity), bone cement use, and polyethylene liner shock absorption.
- The biarticular design's role in reducing extraprosthetic motion may be limited.