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Effect of formaldehyde fixation on some mechanical properties of bovine bone
J D Currey1, K Brear, P Zioupos
1Department of Biology, University of York, UK.
Abstract:
The risk of infection of investigators working on the biomechanics of human bone from a variety of modern pathogens including the human immunodeficiency virus or the hepatitis B virus has increased recently. New safety procedures are needed to reduce that risk. The procedure we follow in our laboratory employs brief (< 3 h) fixation in formaldehyde, and we report here the effects it has on some mechanical properties of bovine bone. Results in quasistatic loading tests were almost unaffected by our fixation protocol, but a significant decrease in impact strength was found. These results indicate that there may be some interaction between fixation and strain rate dependent effects and, therefore, some caution is needed when using common biomechanical measurement methods on fixed bone material.
Insights
Formaldehyde fixation of human bone for biomechanical studies minimally impacts quasistatic strength but significantly reduces impact resistance. Researchers must exercise caution with fixation methods due to potential effects on strain rate-dependent properties.
Area of Science:
- Biomedical Engineering
- Orthopedic Research
- Infectious Disease Safety
Background:
- Increased risk of infection for researchers studying human bone biomechanics from pathogens like HIV and Hepatitis B.
- Need for enhanced safety protocols in bone biomechanics research.
- Formaldehyde fixation as a potential safety measure.
Purpose of the Study:
- To evaluate the effects of formaldehyde fixation on the mechanical properties of bovine bone.
- To determine if formaldehyde fixation impacts bone's response to mechanical testing.
- To inform safety procedures in bone biomechanics laboratories.
Main Methods:
- Bovine bone samples subjected to brief formaldehyde fixation (< 3 hours).
- Quasistatic loading tests performed on fixed and unfixed bone samples.
- Impact strength tests conducted to assess material toughness.
Main Results:
- Quasistatic mechanical properties of bone showed minimal changes after formaldehyde fixation.
- A significant reduction in impact strength was observed in formaldehyde-fixed bone samples.
- Potential interaction between fixation and strain rate-dependent mechanical behavior.
Conclusions:
- Formaldehyde fixation protocols may alter critical mechanical properties of bone, particularly impact strength.
- Caution is advised when utilizing biomechanical measurement methods on formaldehyde-fixed bone.
- Further research is needed to understand fixation effects on strain rate-dependent properties.