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Related Experiment Videos

Two ankle joint laxity testers: reliability and validity.

Gino M M J Kerkhoffs1, Leendert Blankevoort, Inger N Sierevelt

  • 1Department of Orthopedic Surgery, Orthotrauma Research Center Amsterdam, The Netherlands. ginokerkhoffs@hotmail.com

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|July 20, 2005
PubMed
Summary

The dynamic and quasi-static anterior ankle testers demonstrate high reliability for measuring ankle joint laxity. However, their validity requires further investigation, as correlations with established clinical tests were inconsistent.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Sports Medicine

Background:

  • Ankle joint laxity is a common issue following lateral ankle ligament injuries.
  • Objective measurement tools are needed to assess ankle instability accurately.
  • Existing methods like the TELOS stress test and manual anterior drawer test have limitations.

Purpose of the Study:

  • To evaluate the reliability and validity of two novel devices for measuring ankle joint laxity: the dynamic anterior ankle tester (DAAT) and the quasi-static anterior ankle tester (QAAT).
  • To compare the performance of DAAT and QAAT against established clinical assessments, including the TELOS stress test and manual anterior drawer test.

Main Methods:

  • Two devices, DAAT and QAAT, were used to measure ankle joint laxity in 24 healthy subjects and 14 patients with chronic lateral ankle ligament injury.

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  • Intra-observer and inter-observer reliability were assessed for both devices.
  • Concurrent validity was examined by comparing DAAT and QAAT measurements with those from the TELOS stress test and manual anterior drawer test.

    • Main Results:

    • High intra-observer and inter-observer reliability were found for both the DAAT (0.81-0.94) and QAAT (0.71-0.94).
    • Fair correlation was observed between DAAT and QAAT for one observer pair (0.71), but poor correlation for another (0.42).
    • No significant correlations were found between either DAAT or QAAT and the TELOS stress test or manual anterior drawer test.

    Conclusions:

    • The DAAT and QAAT exhibit high reliability for assessing ankle joint laxity.
    • The validity of these new testers, when compared to established methods, requires further investigation and refinement.
    • These devices show potential for objective ankle laxity measurement, but clinical utility needs further study.