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The hand as a concept: digital differences and their importance

D Ranney1

  • 1School of Anatomy, Department of Kinesiology, University of Waterloo, Ontario, Canada.

Clinical Anatomy (New York, N.Y.)
|January 1, 1995
PubMed
Summary

The hand

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Area of Science:

  • Anatomy
  • Biomechanics
  • Kinesiology

Background:

  • Hand digits exhibit unique bone, joint, muscle, and tendon architectures.
  • The hand's structure includes a central framework and mobile segments for grasp and pinch.
  • Sophisticated hand movements rely on multijointed distal appendages.

Purpose of the Study:

  • To analyze the unique anatomical and mechanical characteristics of each hand digit.
  • To investigate the functional role of lumbricals in hand biomechanics.
  • To highlight the necessity of individual digit modeling for accurate hand simulations.

Main Methods:

  • Comparative anatomical analysis of hand digits.
  • Mechanical function assessment of lumbrical muscles.
  • Review of existing hand modeling principles.

Main Results:

  • The thumb's unique structure, lacking a proximal interphalangeal (PIP) joint, negates the mechanical need for a lumbrical.
  • Lumbricals act as PIP joint deflexors and, due to muscle spindles, may influence finger and wrist extensor activity.
  • Individual digit uniqueness is critical for precise mathematical and computer hand models.

Conclusions:

  • Lumbrical function extends beyond simple finger coordination, potentially involving proprioception and synergistic muscle control.
  • Accurate biomechanical modeling of the hand requires accounting for the distinct characteristics of each digit.
  • Understanding digit-specific mechanics is crucial for advancing hand function research and therapeutic interventions.

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