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Related Experiment Videos

Pelvic ring mobility: assessed by stress radiography.

A B Death, R L Kirby, C L MacMillan

    Archives of Physical Medicine and Rehabilitation
    |May 1, 1982
    PubMed
    Summary

    The thigh lever technique offers a sensitive measure for pelvic ring instability, potentially detecting different dimensions of sacroiliac motion than the Chamberlain technique. It serves as a valuable alternative when patients cannot perform the standard single-leg stance.

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    Area of Science:

    • Orthopedics
    • Radiology
    • Biomechanics

    Background:

    • The Chamberlain technique, measuring pubic symphysis motion during a single-leg stance, is a common method for assessing pelvic ring instability.
    • Static biomechanical analysis suggests that dynamic stress tests, like the thigh lever technique, might offer more sensitive indicators of pelvic instability.

    Purpose of the Study:

    • To compare the sensitivity and reliability of the thigh lever technique versus the Chamberlain technique in evaluating pelvic ring instability.
    • To investigate potential differences in the dimensions of sacroiliac motion measured by each technique.

    Main Methods:

    • Radiographic measurements of pubic symphysis motion were performed using both the thigh lever technique and the Chamberlain technique.
    • Thirty-two healthy subjects were evaluated with the thigh lever technique.

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  • Ten symptomatic patients underwent both the thigh lever and Chamberlain techniques.

    • Main Results:

    • In normal subjects, the thigh lever technique showed a mean superior pubic border asymmetry of 0.66 +/- 0.83 mm and symphyseal motion of 0.81 +/- 0.74 mm.
    • No significant correlation was found between symphyseal motion values obtained by the thigh lever and Chamberlain techniques.
    • High interobserver and intraobserver reliability (>=0.95) was observed for superior pubic border measures, with lower reliability for inferior border measures.

    Conclusions:

    • The thigh lever technique may measure different aspects of sacroiliac motion compared to the Chamberlain technique.
    • The Chamberlain technique remains preferred due to its simplicity, comfort, and reliability.
    • The thigh lever technique is a useful alternative for assessing pelvic instability when patients cannot perform the single-leg stance required for the Chamberlain technique.