Validity and reliability of an ultrasound measurement of the free length of the Achilles tendon
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Validity and reliability of an ultrasound measurement of the free length of the Achilles tendon. / Barfod, Kristoffer Weisskirchner; Riecke, Anja Falk; Boesen, Anders; Hansen, Philip; Maier, Jens Friedrich; Doessing, Simon; Troelsen, Anders.
In: Danish Medical Journal, Vol. 65, No. 3, A5453, 2018.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Validity and reliability of an ultrasound measurement of the free length of the Achilles tendon
AU - Barfod, Kristoffer Weisskirchner
AU - Riecke, Anja Falk
AU - Boesen, Anders
AU - Hansen, Philip
AU - Maier, Jens Friedrich
AU - Doessing, Simon
AU - Troelsen, Anders
N1 - Articles published in the DMJ are “open access”. This means that the articles are distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits any non-commercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
PY - 2018
Y1 - 2018
N2 - INTRODUCTION: Valid length measurements of the different segments of the Achilles tendon are needed in order to investigate if differential elongation of the Achilles tendon takes place after rupture. The purpose of this paper was to present data concerning the accuracy and reliability of an ultrasound measurement of the free part of the Achilles tendon.METHODS: Both legs of 19 non-injured subjects were examined by magnetic resonance imagining (MRI) and ultrasound. The length from the distal tip of the soleus muscle to the tendon insertion on the calcaneus was measured by three independent ultrasound examiners. Repeated ultrasound measurements were performed and compared with MRI measurements. Intra-rater and inter-rater reliability and the agreement between MRI and ultrasound were determined. Data were evaluated using the intraclass correlation coefficient (ICC), the standard error of the measurement (SEM) and the minimal detectable change (MDC).RESULTS: The measurement showed excellent intra-rater reliability (ICC = 0.94 (95% confidence interval (CI): 0.91-0.96), SEM = 5 mm and MDC = 13 mm) and inter-rater reliability (ICC = 0.96 (95% CI: 0.93-0.97), SEM = 4 mm and MDC = 11 mm). On average, ultrasound measurements exceeded the MRI measurements by 2 mm (non-significant), resulting in a measurement error of 5%.CONCLUSIONS: The ultrasound measurement of the free part of the Achilles tendon showed good reliability and accuracy. For comparison between groups of non-injured subjects, differences of > 5 mm can be detected. For repeated assessment of individual subject differences ≥ 13 mm can be detected.FUNDING: none.TRIAL REGISTRATION: Institutional Review Board of Zealand, Denmark, Ref. no: SJ-318.
AB - INTRODUCTION: Valid length measurements of the different segments of the Achilles tendon are needed in order to investigate if differential elongation of the Achilles tendon takes place after rupture. The purpose of this paper was to present data concerning the accuracy and reliability of an ultrasound measurement of the free part of the Achilles tendon.METHODS: Both legs of 19 non-injured subjects were examined by magnetic resonance imagining (MRI) and ultrasound. The length from the distal tip of the soleus muscle to the tendon insertion on the calcaneus was measured by three independent ultrasound examiners. Repeated ultrasound measurements were performed and compared with MRI measurements. Intra-rater and inter-rater reliability and the agreement between MRI and ultrasound were determined. Data were evaluated using the intraclass correlation coefficient (ICC), the standard error of the measurement (SEM) and the minimal detectable change (MDC).RESULTS: The measurement showed excellent intra-rater reliability (ICC = 0.94 (95% confidence interval (CI): 0.91-0.96), SEM = 5 mm and MDC = 13 mm) and inter-rater reliability (ICC = 0.96 (95% CI: 0.93-0.97), SEM = 4 mm and MDC = 11 mm). On average, ultrasound measurements exceeded the MRI measurements by 2 mm (non-significant), resulting in a measurement error of 5%.CONCLUSIONS: The ultrasound measurement of the free part of the Achilles tendon showed good reliability and accuracy. For comparison between groups of non-injured subjects, differences of > 5 mm can be detected. For repeated assessment of individual subject differences ≥ 13 mm can be detected.FUNDING: none.TRIAL REGISTRATION: Institutional Review Board of Zealand, Denmark, Ref. no: SJ-318.
KW - Achilles Tendon/anatomy & histology
KW - Adult
KW - Denmark
KW - Female
KW - Humans
KW - Magnetic Resonance Imaging
KW - Male
KW - Middle Aged
KW - Reproducibility of Results
KW - Tendon Injuries/diagnostic imaging
KW - Ultrasonography
M3 - Journal article
C2 - 29510804
VL - 65
JO - Danish Medical Journal
JF - Danish Medical Journal
SN - 2245-1919
IS - 3
M1 - A5453
ER -
ID: 217558881