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Related Experiment Video

Updated: Sep 30, 2025

Measurement of Spatial Stability in Precision Grip
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Finger stability in precision grips.

Neelima Sharma1, Madhusudhan Venkadesan1

  • 1Department of Mechanical Engineering & Materials Science, Yale University, New Haven, CT 06520.

Proceedings of the National Academy of Sciences of the United States of America
|March 16, 2022
PubMed
Summary

Human finger dexterity relies on muscle stiffness to prevent buckling during precision grips. Adding external stiffness allows for greater fingertip force without compromising stability, revealing a balance between stability and compliance in hand function.

Keywords:
cocontractionhuman handmuscle elasticityprecision gripstability

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human motor control

Background:

  • Stable precision grips are essential for hand dexterity.
  • Fingers can become unstable and hyperextend due to buckling of the multi-link mechanism under tip forces.
  • The neuromuscular mechanism for suppressing finger instability is not well understood.

Purpose of the Study:

  • To investigate the role of muscle-induced stiffness in maintaining finger stability during precision grips.
  • To determine how the neuromuscular system achieves finger stability under load.
  • To explore the trade-offs between finger stability and compliance.

Main Methods:

  • Measured buckling time constants during maximal index finger force application.
  • Utilized a biomechanical model of the finger to predict stability limits.
  • Tested the effect of adding external joint stiffness on maximal force and muscle activity in 38 volunteers.
  • Recorded muscle electromyography (EMG) to assess muscle cocontraction and force generation.

Main Results:

  • Buckling time constants were rapid (≤50 ms), suggesting a role for muscle stiffness.
  • Adding external stiffness increased maximal force by 34% and finger flexor EMG by 21%.
  • Mathematical modeling and muscle recordings indicated that added stiffness reduces the need for muscle cocontraction, enabling higher fingertip forces.

Conclusions:

  • Neurally tuned muscle stiffness is crucial for maintaining finger stability and enabling high fingertip forces.
  • Individuals limit maximal voluntary force unless external stabilizing stiffness is present.
  • Optimal hand function involves a balance between muscle stiffness for stability and compliance for adaptability and precise force regulation.