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Changes in strain distribution along the radius and ulna with loading and interosseous membrane section
Robert A Kaufmann1, Scott H Kozin, Arlian Barnes
1Department of Orthopaedic Surgery, Temple University School of Mechanical Engineering, Philadelphia, PA, USA.
The Journal of Hand Surgery
|January 26, 2002
Summary
Transecting the interosseous membrane (IOM) in the forearm increases tensile strain on the radius and ulna. This indicates greater bending forces on these bones after IOM section during loading.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- The forearm's stability relies on the radius, ulna, and interosseous membrane (IOM).
- Understanding strain distribution is crucial for forearm injury and treatment analysis.
Purpose of the Study:
- To analyze strain distribution in the radius and ulna under load.
- To evaluate the impact of interosseous membrane (IOM) transection on forearm bone strain.
Main Methods:
- Biomechanical analysis of four cadaveric upper extremities.
- Strain gauge application to radius and ulna.
- Forearm loading with a carpal implant in neutral rotation.
- Strain measurement before and after IOM transection.
Main Results:
- Under load, compressive strain increased on the ulna's ulnar border; tensile strain increased on the dorsal radius/ulna and radius's lateral border.
- After IOM transection, tensile strain increased on the radius's lateral border and ulna's ulnar border.
- No significant strain change occurred on the dorsal radius or ulna post-IOM transection.
Conclusions:
- The interosseous membrane (IOM) influences forearm bone strain distribution.
- IOM transection leads to increased bending moments on the radius and ulna.
- Findings have implications for understanding forearm biomechanics and injury.