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Related Experiment Videos

Wrist kinematics. Row, column or both?

M A Craigen1, J K Stanley

  • 1Department of Upper Limb Surgery, Wrightington Hospital, Wigan, UK.

Journal of Hand Surgery (Edinburgh, Scotland)
|April 1, 1995
PubMed
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Wrist carpal kinematics vary, with scaphoid shortening and ulnar translation inversely correlated. This study proposes a "CR index" to quantify wrist type, potentially predicting treatment outcomes for scapholunate dissociation.

Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanics

Background:

  • Carpal kinematics describe wrist bone movement.
  • Understanding variations in carpal motion is crucial for diagnosing and treating wrist injuries.
  • The relationship between scaphoid motion and overall wrist mechanics requires further elucidation.

Purpose of the Study:

  • To analyze the relationship between scaphoid shortening and ulnar translation during wrist deviation.
  • To investigate potential sex-based differences in carpal kinematics.
  • To propose a quantifiable index for categorizing wrist mechanics and its implications for treating scapholunate dissociation.

Main Methods:

  • Radiographic analysis of 52 wrists.
  • Measurement of scaphoid shortening and ulnar translation across the range of ulnar to radial deviation.

Related Experiment Videos

  • Statistical correlation analysis between scaphoid shortening and ulnar translation.
  • Comparison of kinematic patterns between sexes.

    • Main Results:

    • Scaphoid shortening and ulnar translation exhibited a normal distribution across wrist deviation.
    • A significant inverse correlation was found: increased scaphoid shortening correlated with decreased ulnar translation, and vice versa.
    • Female subjects demonstrated a tendency towards greater scaphoid shortening and less ulnar translation.
    • These findings suggest carpal kinematics exist on a spectrum from "row" to "column" theories, with women more frequently exhibiting a "column" type wrist.

    Conclusions:

    • Carpal kinematics display a spectrum of motion, quantifiable by the proposed "CR index".
    • Observed variations in scaphoid motion may influence the efficacy of surgical treatments for scapholunate dissociation.
    • The "CR index" may serve as a predictive tool for surgical outcomes in scapholunate dissociation.