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Bone remodelling around a cemented polyethylene cup. A longitudinal densitometry study.

N R Shetty1, A J Hamer, R M Kerry

  • 1Academic Department of Bone Metabolism, University of Sheffield Northern General Hospital, UK.

The Journal of Bone and Joint Surgery. British Volume
|March 29, 2006
PubMed
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This study shows bone mineral density (BMD) around cemented acetabular components is repeatable with dual-energy x-ray absorptiometry. Bone loss is minimal and temporary, returning to baseline within two years.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Biomedical Engineering

Background:

  • Cemented acetabular components are widely used in hip replacements.
  • Understanding bone mineral density (BMD) changes around these components is crucial for assessing implant stability and longevity.
  • Dual-energy X-ray absorptiometry (DXA) is a common tool for BMD assessment.

Purpose of the Study:

  • To assess the repeatability of BMD measurements around cemented Charnley acetabular components using DXA.
  • To determine the longitudinal changes in BMD in the first 24 months post-surgery.
  • To characterize the pattern and extent of bone loss and recovery.

Main Methods:

  • Repeatability study involving 19 subjects with cemented acetabular components.
  • Longitudinal study of 27 patients followed for 24 months post-surgery.

Related Experiment Videos

  • BMD measurements using dual-energy X-ray absorptiometry (DXA) with a four-region-of-interest model.

    • Main Results:

    • Measurement precision for BMD ranged from 7.7% to 10.8% across different regions.
    • A transient decrease in net pelvic BMD was observed within the first 12 months.
    • Significant bone loss (7-10%) occurred medially within three months, recovering to baseline by 24 months.

    Conclusions:

    • DXA is a reliable method for measuring BMD changes around cemented acetabular components.
    • Bone loss following cemented Charnley acetabular component insertion is small and transient.
    • Pelvic bone mass returns to baseline by two years, suggesting uniform load transmission to the acetabulum.