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Related Experiment Videos

Thumb joint flexion. What is normal?

M Jenkins1, H B Bamberger, L Black

  • 1Ohio University College of Osteopathic Medicine, Dayton, USA.

Journal of Hand Surgery (Edinburgh, Scotland)
|January 15, 1999
PubMed
Summary
This summary is machine-generated.

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This study measured thumb joint active flexion in 119 subjects. Findings suggest current normal values for metacarpophalangeal (MP) and interphalangeal (IP) thumb flexion may need revision for impairment assessments.

Area of Science:

  • Orthopedics
  • Hand Therapy
  • Biomechanics

Background:

  • Accurate measurement of thumb joint range of motion is crucial for diagnosing and managing hand conditions.
  • Existing literature provides established normal values for thumb active flexion, but these may not reflect current populations.

Purpose of the Study:

  • To quantify active flexion in normal thumb metacarpophalangeal (MP) and interphalangeal (IP) joints.
  • To compare these measurements against previously reported normal values.
  • To inform potential revisions of accepted thumb flexion norms.

Main Methods:

  • A cohort of 119 healthy subjects (238 thumbs) participated.
  • Active flexion of the MP and IP joints was measured using a computerized Greenleaf goniometer.
  • Measurements were performed by a certified hand therapist.

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Main Results:

  • The mean active flexion for the metacarpophalangeal (MP) joint was 59 degrees.
  • The mean active flexion for the interphalangeal (IP) joint was 67 degrees.

Conclusions:

  • The measured thumb active flexion values differ from some previously accepted norms.
  • These findings indicate a need to reconsider current reference values for thumb flexion.
  • Revised norms could improve the accuracy of impairment evaluations in hand therapy.