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Related Experiment Videos

Proximal interphalangeal joint stiffness: measurement and analysis.

Emil Dionysian1, J Michael Kabo, Frederick J Dorey

  • 1Department of Orthopaedic Surgery, University of California Los Angeles School of Medicine, Los Angeles, CA, USA.

The Journal of Hand Surgery
|June 1, 2005
PubMed
Summary

Human finger proximal interphalangeal (PIP) joint stiffness was quantified, revealing greater stiffness in men and larger fingers. This data may aid objective treatment outcome assessments for PIP joint stiffness.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Human Anatomy

Background:

  • The proximal interphalangeal (PIP) joint is crucial for hand function.
  • Quantifying PIP joint stiffness is essential for understanding normal mechanics and assessing pathology.
  • Limited data exists on the quantitative stiffness of the normal human PIP joint across a diverse population.

Purpose of the Study:

  • To quantitatively measure the stiffness of the human finger PIP joint.
  • To investigate the relationship between PIP joint stiffness and various clinical parameters.

Main Methods:

  • Eighty-nine healthy adult subjects participated in the study.
  • A computer-controlled moment-angle plotter was utilized to measure PIP joint stiffness and energy absorption during passive motion.

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  • Measurements were taken for the index, middle, and ring fingers.

    • Main Results:

    • The average overall PIP joint stiffness was 0.05 N-cm/degree.
    • Finger stiffness and energy absorption positively correlated with finger size.
    • Men exhibited stiffer fingers and greater energy absorption compared to women.
    • No significant associations were found with age, time of day, occupation, hobbies, or hand dominance.
    • Heavier individuals demonstrated increased stiffness and energy absorption.

    Conclusions:

    • PIP joint stiffness has been quantitatively defined in a broad normal population.
    • Findings indicate greater stiffness in men and individuals with larger fingers.
    • This quantitative data may facilitate objective outcome assessments for PIP joint stiffness treatments.