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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
Shear fatigue micromechanics of the cement-bone interface: An in vitro study using digital image correlation
Kenneth A Mann1, Mark A Miller, Amos Race
1Department of Orthopedic Surgery, SUNY Upstate Medical University, 3216 Institute for Human Performance, 750 East Adams Street, Syracuse, New York 13210, USA. mannk@upstate.edu
Summary
Cement-bone interface damage from shear fatigue loading was studied. Damage progression and stiffness changes were measured, revealing insights to minimize aseptic loosening in orthopedic implants.
Area of Science:
- Biomaterials Science
- Orthopedic Biomechanics
- Materials Science
Background:
- Aseptic loosening is a major cause of orthopedic implant failure.
- The mechanical behavior of the cement-bone interface under fatigue is not well understood.
- Understanding interface damage is crucial for improving implant longevity.
Purpose of the Study:
- To investigate the mechanical damage response of the cement-bone interface under shear fatigue loading.
- To quantify stiffness changes and creep damage progression at the interface.
- To identify factors influencing interface damage and propose mitigation strategies.
Main Methods:
- In vitro study using cement-bone specimens subjected to shear fatigue loading.
- Digital image correlation techniques to measure stiffness changes and creep damage.
- Analysis of damage localization and microcrack formation in cement and bone.
Main Results:
- Stiffness changes and creep damage were localized to the cement-bone interface.
- Interface creep damage exhibited a three-phase response: rapid, steady-state, and final rapid increase.
- Initial creep phase showed increased interface stiffness (locking-in effect), followed by decreased stiffness as damage progressed.
- Power law models effectively described creep and stiffness damage based on loading magnitude, cycles, and contact area.
- More microcrack damage was observed in cement than in bone, localized along the interface.
Conclusions:
- Damage to the cement-bone interface is a key factor in aseptic loosening.
- Improving cement-bone contact and enhancing cement fatigue resistance can minimize interface damage.
- The findings provide critical data for designing more durable orthopedic implants.
