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Wrist circumduction reduced by finger constraints
Sebastian V Gehrmann1, Robert A Kaufmann, Zong-Ming Li
1Hand Research Laboratory, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.
The Journal of Hand Surgery
|October 22, 2008
Summary
Finger posture significantly impacts wrist mobility. Constraining fingers reduces wrist flexion and ulnar deviation, highlighting the need for standardized assessments in clinical practice.
Area of Science:
- Biomechanics
- Human motion analysis
- Orthopedics
Background:
- Assessing wrist motion is crucial for diagnosing and treating injuries.
- The influence of finger posture on wrist movement is not well understood.
Purpose of the Study:
- To investigate how finger constraints affect maximum wrist circumduction.
- To quantify the impact of different finger postures on wrist mobility.
Main Methods:
- Fifteen male subjects performed maximal wrist circumduction with unconstrained fingers and while holding cylinders (50mm and 25mm) or in a fist.
- A motion analysis system captured wrist movement.
- Circumduction envelopes were constructed to calculate ranges of motion (flexion-extension and radial-ulnar deviation) and envelope area.
Main Results:
- Finger constraints significantly reduced wrist flexion and ulnar deviation ranges.
- Flexion decreased by 13-27% and ulnar deviation by 10-11% compared to unconstrained fingers.
- Overall wrist mobility, measured by circumduction envelope area, decreased by 15-23%.
Conclusions:
- Synergistic motion between finger and wrist joints facilitates wrist mobility.
- Static finger flexion postures decrease wrist flexion and ulnar deviation.
- Standardized finger configurations are recommended for clinical wrist motion assessment.
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