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Glenoid cancellous bone strength and modulus.

C Anglin1, P Tolhurst, U P Wyss

  • 1Clinical Mechanics Group, Queen's University, Kingston, Canada. carolyn.anglin@sulzer.ch

Journal of Biomechanics
|September 7, 1999
PubMed
Summary
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This study measured the strength and modulus of glenoid cancellous bone, finding the postero-superior region to be strongest. These bone properties are crucial for designing better shoulder prostheses and understanding bone substitute suitability.

Area of Science:

  • Orthopedic biomechanics
  • Biomaterials science
  • Skeletal biology

Background:

  • Glenoid bone properties are critical for shoulder prosthesis longevity.
  • Understanding regional variations in glenoid bone mechanical properties is essential for implant design and failure analysis.
  • Age-related and disease-related changes in bone quality necessitate accurate mechanical data.

Purpose of the Study:

  • To determine the strength and elastic modulus of human glenoid cancellous bone.
  • To investigate regional variations in these mechanical properties.
  • To inform the selection of bone substitutes and guide finite element analysis for glenoid prostheses.

Main Methods:

  • In situ indentation testing was performed on ten glenoids from eight elderly cadavers.

Related Experiment Videos

  • Mechanical properties (strength and E modulus) were measured across different regions of the glenoid.
  • Data were analyzed to identify regional trends and overall mean values.

    • Main Results:

    • Overall mean bone strength was 10.3 MPa, with regional variations.
    • Overall mean E modulus was 99 MPa, showing regional differences.
    • The postero-superior region was the strongest; the central column was weaker but deeper. A significant drop in properties below the subchondral layer was observed.

    Conclusions:

    • The measured bone strength and modulus values, though potentially lower due to advanced age, are relevant for designing prostheses, especially for patients with reduced bone quality (e.g., rheumatoid arthritis).
    • The postero-superior region exhibits the highest mechanical integrity.
    • Preserving the subchondral bone layer is vital during prosthetic surgery due to the steep decline in mechanical properties beneath it.