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Midcarpal Structure Effect on Force Distribution through the Radiocarpal Joint.
Ronit Wollstein1, Aviv Kramer2, Scott Friedlander1
1Department of Orthopaedic Surgery, School of Medicine, New York University, New York, New York.
Journal of Wrist Surgery
|December 10, 2019
Summary
Wrist bone structure influences how forces are transferred to the radius and ulna. Different wrist types and lunate shapes affect this force distribution, impacting wrist function and pathology development.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- The wrist's complex anatomy presents distinct structural patterns.
- Previous research classified radiographic wrist types by lunate and capitate morphology.
- Hypothesized that these structural variations lead to differential force transmission within the wrist.
Purpose of the Study:
- To investigate the correlation between wrist morphology and the forces transferred to the distal radius and ulna.
- To quantify how anatomical variations influence wrist biomechanics under load.
Main Methods:
- Analysis of radiographs from 46 cadaver wrists previously subjected to force transfer testing.
- Measurement of compressive force percentage through the distal ulna using load cells.
- Application of 22.2 N tensile forces to tendons in neutral and deviated wrist positions.
Main Results:
- Significant association found between wrist type and lunate type with the percentage of force transmitted through the ulna (p=0.002, p=0.0003).
- Capitate circumference demonstrated a correlation with the percentage of force transfer (p=0.02, r=0.34).
Conclusions:
- Distinct patterns of force transfer exist across different morphological wrist types.
- Understanding these biomechanical differences is crucial for comprehending wrist function and pathology.
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