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A new methodology to measure load transfer through the forearm using multiple universal force sensors
H J Pfaeffle1, K J Fischer, T T Manson
1Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, PA 15213, USA.
Journal of Biomechanics
|November 24, 1999
Summary
This study introduces a new 3-D method to measure forearm forces, revealing the interosseous ligament (IOL) relieves radius load. This improves understanding of forearm biomechanics and injury mechanisms.
Area of Science:
- Biomechanics
- Orthopedic Biomechanics
- Musculoskeletal Research
Background:
- Previous forearm force measurement assumed uniaxial forces in radius and ulna.
- Accurate 3-D force vector determination in forearm structures, including the interosseous ligament (IOL), was lacking.
Purpose of the Study:
- To develop and validate a novel methodology for quantitatively determining 3-D force vectors in forearm structures under compressive load.
- To analyze the load distribution in the radius, ulna, and IOL.
Main Methods:
- Utilized a materials testing machine with a 6-DOF universal force-moment sensor (UFS) to apply uniaxial compressive force to cadaveric forearms.
- Implanted miniature UFSs into the distal radius and proximal ulna.
- Employed a 3-D digitizing device and CT-generated models for coordinate system transformations and 3-D force vector visualization.
Main Results:
- The developed method demonstrated repeatability within 3 N and accuracy within 2 N for force magnitudes.
- The radius carries the majority of the load at the wrist.
- The IOL was found to relieve load in the radius at the mid-forearm, with a force of 36 ± 21 N for a 136 N applied hand force.
Conclusions:
- The novel methodology accurately determines 3-D force vectors in forearm structures, including the IOL.
- This approach provides crucial insights into forearm load sharing and biomechanics.
- 3-D visualization aids in understanding complex force transmission within the forearm.