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A fatigue damage model for the cement-bone interface.

Do-Gyoon Kim1, Mark A Miller, Kenneth A Mann

  • 1Department of Orthopaedic Surgery, Institute for Human Performance, SUNY Upstate Medical University, Syracuse, NY 13210, USA. kim@bjc.hfh.edu

Journal of Biomechanics
|September 1, 2004
PubMed
Summary
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Fatigue damage in cemented hip replacements occurs via creep deformation, not stiffness loss. A new model predicts failure time based on creep strain rate, aiding implant assessment.

Area of Science:

  • Biomaterials Science
  • Orthopedic Biomechanics
  • Medical Device Engineering

Background:

  • Cemented total hip replacements can loosen due to fixation loss at the cement-bone interface.
  • Understanding fatigue damage mechanisms is crucial for improving implant longevity.

Purpose of the Study:

  • To determine the fatigue damage response of cement-bone constructs under shear loading.
  • To develop a general damage model for the cement-bone interface under fatigue loading.

Main Methods:

  • Subjecting cement-bone constructs to shear fatigue loading.
  • Observing and analyzing the three-phase fatigue response (early damage, constant rate, fracture).
  • Developing a damage model using a Von Mises equivalent stress/strain concept.

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Main Results:

  • Fatigue damage resulted solely from creep (permanent) deformation, with no loss in cyclic stiffness.
  • Time to failure strongly correlated with equivalent creep strain rate (r2=0.971).
  • Equivalent creep strain at failure was independent of applied equivalent stress.

Conclusions:

  • A general creep damage model can describe the fatigue response of the cement-bone interface.
  • This model, combined with a constant final equivalent strain criterion, can assess cement-bone failure in implant systems.
  • Findings offer insights into improving the durability of cemented hip implants.