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Related Experiment Videos

Osteodensitometry after total hip replacement with uncemented taper-design stem.

Rainer Schmidt1, Tobias E Nowak, Lutz Mueller

  • 1Department of Orthopaedic Surgery, University of Erlangen-Nuremberg, Nuremberg, Germany.

International Orthopaedics
|June 30, 2004
PubMed
Summary

This study on uncemented total hip replacement found good clinical outcomes and radiological stability after 3 years. Femoral bone mineral density loss was lower than in comparable studies, suggesting improved bone preservation.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Radiology

Background:

  • Uncemented total hip replacement is a common procedure.
  • Assessing periprosthetic bone mineral density (BMD) is crucial for long-term implant survival.
  • Previous studies have indicated significant bone loss around uncemented femoral stems.

Purpose of the Study:

  • To evaluate femoral periprosthetic bone mineral density (BMD) in patients undergoing uncemented total hip replacement.
  • To assess the clinical and radiological outcomes at a minimum 3-year follow-up.
  • To compare the observed BMD changes with existing literature.

Main Methods:

  • Prospective follow-up of 24 patients (26 hips) with uncemented total hip replacement.
  • Quantitative computed tomography osteodensitometry used to measure femoral periprosthetic BMD.

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  • Clinical assessment using Harris hip score and radiological evaluation at 3 years.

    • Main Results:

    • High clinical success rate: 25 hips rated good or excellent.
    • Significant improvement in mean Harris hip score from 58 to 94.
    • Radiological stability observed in all hips.
    • Mean decrease in overall femoral metaphysis BMD was 14.3% and cortical BMD was 17.3%.
    • Mean decrease in overall diaphysis BMD was 5.5% and cortical BMD was 4.5%.
    • Observed bone loss was markedly lower than in comparable series.

    Conclusions:

    • Uncemented total hip replacement demonstrates favorable clinical and radiological outcomes at 3 years.
    • Femoral periprosthetic bone mineral density loss is present but appears lower compared to previous studies.
    • These findings suggest potential for improved bone preservation with modern uncemented femoral stems.