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Updated: Jul 2, 2026
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
A modified PMMA cement (Sub-cement) for accelerated fatigue testing of cemented implant constructs using cadaveric
Amos Race1, Mark A Miller, Kenneth A Mann
1Musculoskeletal Science Research Center, Institute for Human Performance (3217), SUNY Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA. racea@upstate.edu
Journal of Biomechanics
|September 9, 2008
Summary
Researchers developed a modified bone cement (Sub-cement) to accelerate fatigue testing of implant systems. This new material significantly speeds up crack initiation and growth, improving pre-clinical screening of cemented implants.
Area of Science:
- Biomaterials Engineering
- Orthopedic Surgery
- Mechanical Engineering
Background:
- Pre-clinical screening of cemented implant systems requires accurate simulation of long-term cyclic loading effects.
- Current methods may not fully capture the complex fatigue behavior of the implant/cement/bone construct.
Purpose of the Study:
- To develop and evaluate a modified bone cement (Sub-cement) for accelerated fatigue testing of cemented implant systems.
- To simulate long-term fatigue responses in shorter cadaver tests.
Main Methods:
- Formulation of polymethylmethacrylate (PMMA) bone cement with a chain-transfer agent to create Sub-cement.
- Characterization of Sub-cement's molecular weight, reaction kinetics, handling, and static mechanical properties.
- Testing of Sub-cement's fatigue crack propagation rates and crack growth in simplified physical models.
Main Results:
- Sub-cement exhibited significantly higher fatigue crack propagation rates (25+/-19 times) compared to standard cement.
- In a 2 1/2-D physical model, Sub-cement accelerated crack growth from the implant stem by a factor of 100.
- Sub-cement effectively accelerated both crack initiation and growth rates.
Conclusions:
- Sub-cement provides a viable method for accelerating the fatigue testing of cemented implant systems.
- This approach enhances the efficiency of pre-clinical screening by simulating long-term wear in shorter test durations.
- Further evaluation in full stem/cement/femur models is underway.
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