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Compressive behavior of human bone-cement composites.

M H Jofe1, T Takeuchi, W C Hayes

  • 1Department of Orthopaedic Surgery, Charles A. Dana Research Institute, Beth Israel Hospital, Boston, MA 02215.

The Journal of Arthroplasty
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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The mechanical properties of bone-cement composites used in joint replacements are closer to bone than cement. Surgical outcomes may have lower mechanical properties than previously assumed.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Mechanical Engineering

Background:

  • Total joint arthroplasty often involves cementing with polymethylmethacrylate (PMMA).
  • This creates a bone-PMMA composite zone with variable properties.
  • Understanding this composite's mechanical behavior is crucial for implant longevity.

Purpose of the Study:

  • To characterize the compressive mechanical properties of the bone-PMMA composite.
  • To evaluate the influence of cement viscosity, introduction method, and timing on properties.
  • To compare in vitro findings with in vivo surgical conditions.

Main Methods:

  • Fabrication of bone-PMMA composite specimens under controlled in vitro conditions.
  • Testing of compressive mechanical properties (strength and modulus).

Related Experiment Videos

  • Analysis of cement volume fraction and correlation with bone porosity.

    • Main Results:

    • Bone-PMMA composite properties were closer to trabecular bone than PMMA.
    • Compressive strengths ranged from 29-50 MPa; moduli from 539-1,210 MPa.
    • No significant correlation found between properties and initial bone porosity.

    Conclusions:

    • In vitro bone-PMMA composites exhibit properties closer to bone, not cement.
    • Surgically created bone-cement regions likely have lower mechanical properties than ideal.
    • Current assumptions about in vivo bone-cement composite strength may be overestimated.