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Related Experiment Videos

The relationship between elbow flexor volume and angular stiffness at the elbow.

Gary S. Chleboun1, John N Howell, Robert R Conatser

  • 1Ohio University School of Physical Therapy, Athens, OH, USA.

Clinical Biomechanics (Bristol, Avon)
|June 21, 2001
PubMed
Summary

Elbow flexor muscle volume predicts initial joint stiffness. Shoulder position significantly impacts elbow joint stiffness, highlighting the role of bi-articular muscles in passive properties.

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Area of Science:

  • Biomechanics
  • Musculoskeletal physiology

Background:

  • Previous studies linked arm volume to joint stiffness, but lacked specificity.
  • Bi-articular muscle pre-positioning can alter joint range of motion and stiffness.

Purpose of the Study:

  • Correlate elbow flexor muscle volume with elbow angular stiffness.
  • Determine the contribution of biceps brachii and brachialis to stiffness.
  • Investigate the effect of shoulder position on elbow joint stiffness.

Main Methods:

  • Measured elbow angular stiffness in 29 healthy adults.
  • Calculated elbow flexor muscle volume using ultrasound imaging.
  • Manipulated shoulder position (flexion vs. extension) to alter biceps brachii length.

Main Results:

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  • Significant linear correlation found between elbow flexor volume and phase 1 stiffness (r=0.92 in flexion, r=0.79 in extension).
  • Phase 2 stiffness showed no linear relationship with muscle volume.
  • Shoulder extension resulted in significantly greater phase 1 and phase 2 stiffness compared to shoulder flexion.

Conclusions:

  • Elbow flexor muscle volume is a reliable predictor of early-phase elbow joint stiffness.
  • A model suggests additive contributions of biceps and brachialis to stiffness, influenced by shoulder position.
  • Understanding these relationships aids clinical assessment of muscle stiffness in various patient populations.