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Related Experiment Videos

Mechanical characteristics of the stem-cement interface.

K A Mann1, D L Bartel, T M Wright

  • 1Cornell-Hospital for Special Surgery Program, Cornell University, Ithaca, New York 14853.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|November 1, 1991
PubMed
Summary

The mechanical behavior of metallic stem and bone cement interfaces is primarily governed by friction and residual stress, not chemical bonding. This finding aids in understanding implant stability and performance.

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Area of Science:

  • Biomaterials Science
  • Mechanical Engineering
  • Orthopedic Surgery

Background:

  • The interface between metallic orthopedic implants and bone cement is critical for load transfer and long-term stability.
  • Understanding the mechanical behavior of this interface is essential for predicting implant performance and longevity.

Purpose of the Study:

  • To investigate and quantify the mechanical characteristics of the interface between metallic stems and poly(methyl methacrylate) bone cement.
  • To determine the influence of friction and residual stresses on the load-displacement behavior of the stem-cement composite.

Main Methods:

  • Experimental push-through-stem tests were conducted on titanium alloy stems within poly(methyl methacrylate) cement columns.
  • Nonlinear, axisymmetric finite element analyses were employed, incorporating Coulomb friction elements and modeling residual stresses via thermal contraction.

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  • Load-displacement behavior and surface strain distributions were measured and compared between experimental and computational models.

    • Main Results:

    • A coefficient of friction of 0.3 at the titanium alloy-cement interface provided good agreement between experimental and finite element analysis predictions.
    • The study demonstrated that load-displacement behavior is accurately described by interface friction and normal residual stresses, in the absence of chemical adhesion.
    • Finite element models successfully predicted experimental load-displacement curves and surface strains.

    Conclusions:

    • The mechanical interface behavior between metallic stems and bone cement is predominantly dictated by frictional forces and normal residual stresses.
    • Chemical adhesion plays a negligible role in the load-displacement characteristics of this composite system.
    • Accurate modeling of friction and residual stress is crucial for predicting the mechanical performance of cemented orthopedic implants.