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Kendall's Tau Test01:16

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Kendall's tau test, also known as the Kendall rank coefficient test, is a nonparametric method for assessing association between two variables. This test is particularly useful for identifying significant correlations when the distributions of the sample and population are unknown. Developed in 1938 by the British statistician Sir Maurice George Kendall, the tau coefficient (denoted as τ) serves as a rank correlation coefficient, with values ranging from -1 to +1.
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Related Experiment Video

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Author Spotlight: Exploring the Complexities of Achilles Tendon Injuries — Research and Future Directions
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The Reliability of Kager's Triangle in Detecting Acute Achilles Tendon Ruptures.

Christopher M Belyea, Kevin P Krul, Gregory Lause

    Orthopedics
    |December 17, 2019
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    Summary

    Diagnosing Achilles tendon ruptures can be challenging, often mistaken for ankle sprains. Analyzing Kager's triangle on X-rays may help identify ruptures, but its accuracy needs more research.

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    Area of Science:

    • Orthopedics
    • Sports Medicine
    • Radiology

    Background:

    • Achilles tendon injuries are frequent in athletes and recreational participants.
    • Acute Achilles tendon ruptures are often misdiagnosed as ankle sprains, particularly in males.
    • Delayed diagnosis and treatment can negatively impact clinical outcomes.

    Purpose of the Study:

    • To evaluate the utility of Kager's triangle obscuration on lateral ankle radiographs as an indicator of Achilles tendon rupture.
    • To address the lack of reported sensitivity and specificity data for this radiographic finding.

    Main Methods:

    • Review of lateral ankle radiographs to assess Kager's triangle.
    • Correlation of radiographic findings with clinical diagnosis of Achilles tendon rupture.

    Main Results:

    • Obscuration of Kager's triangle was identified as a potential radiographic sign of Achilles tendon rupture.
    • The sensitivity and specificity of this sign have been poorly reported in previous literature.

    Conclusions:

    • Kager's triangle analysis on lateral ankle radiographs may serve as an adjunctive diagnostic tool for Achilles tendon ruptures.
    • Further studies are needed to establish the definitive diagnostic accuracy of Kager's triangle obscuration.