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Normal digital contribution to grip strength assessed by a computerized digital dynamometer

J S Talsania1, S H Kozin

  • 1Department of Orthopaedic Surgery, Temple University School of Medicine, Philadelphia, PA 19140, USA.

Journal of Hand Surgery (Edinburgh, Scotland)
|June 2, 1998
PubMed
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This study measured individual finger contributions to grip strength using a digital dynamometer. The index, long, ring, and small fingers consistently contributed approximately 25%, 35%, 26%, and 15% to overall grip force, respectively.

Area of Science:

  • Biomechanics
  • Human Physiology
  • Hand Strength Analysis

Background:

  • Grip strength is a crucial indicator of overall health and functional capacity.
  • Understanding individual finger contributions to grip is essential for rehabilitation and ergonomic design.

Purpose of the Study:

  • To quantify the percentage contribution of each finger (index, long, ring, small) to total grip strength.
  • To determine if these contributions vary with handle size or hand dominance.

Main Methods:

  • Utilized a computerized digital dynamometer to record force data from individual digits and total grip.
  • Assessed 100 hands from 50 healthy subjects, measuring contributions at three handle sizes.
  • Calculated the percentage contribution of each finger to the total grip force.

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Main Results:

  • Individual finger contributions to grip strength were consistently observed: index (approx. 25%), long (approx. 35%), ring (approx. 26%), and small (approx. 15%).
  • This proportional contribution pattern remained stable across different handle sizes.
  • Hand dominance and overall grip strength did not significantly alter the relative force exerted by each finger.

Conclusions:

  • The long finger plays the most significant role in overall grip strength, followed by the index and ring fingers.
  • The distribution of force among fingers is a stable characteristic of healthy hand function, independent of external factors like handle size or hand dominance.