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The Capital Region of Denmark - a part of Copenhagen University Hospital
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The Achilles Tendon Length Measure and the Achilles Tendon Resting Angle show acceptable construct validity using the Copenhagen Achilles Length Measure as gold standard

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Background: Elongation of the Achilles tendon after rupture is a frequent complication. The Achilles Tendon Length Measure (ATLM) and the Achilles Tendon Resting Angle (ATRA) are indirect length measures using the resting angle of the ankle. Copenhagen Achilles Length Measure (CALM) is a direct ultrasound measure. The purpose of this study was to examine the construct validity of ATLM and ATRA using CALM as gold standard. Methods: As the three measurements measure slightly different constructs and have different scales a direct comparison was not possible. Instead a mixed linear regression model was performed investigating the three models: CALM-ATRA, CALMATLM and ATRA-ATLM. Results: 130 patients were available for analysis. All three regression models demonstrated a statistically significant (p < 0.01) linear relationship and acceptable certainty of the estimates. Conclusion: ATRA and ATLM were found to have acceptable construct validity when using CALM as gold standard for assessing tendon elongation after an Achilles tendon rupture.

Original languageEnglish
JournalFoot and Ankle Surgery
Volume27
Issue number6
Pages (from-to)655-659
Number of pages5
ISSN1268-7731
DOIs
Publication statusPublished - 1 Aug 2021

    Research areas

  • Achilles tendon rupture, Elongation, Outcome measure, Validity

ID: 60792273