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Magnetic resonance imaging and freehand 3-D ultrasound provide similar estimates of free achilles tendon shape and 3-D geometry

journal contribution
posted on 30.10.2019, 00:00 authored by D Devaprakash, DG Lloyd, RS Barrett, Steven ObstSteven Obst, B Kennedy, KL Adams, A Hunter, N Vlahovich, DL Pease, C Pizzolato
The purpose of this study was to assess the similarity of free Achilles tendon shape and 3-D geometry between magnetic resonance imaging (MRI) and freehand 3-D ultrasound (3-DUS) imaging methods. Fourteen elite/sub-elite middle-distance runners participated in the study. MRI and 3-DUS scans of the Achilles tendon were acquired on two separate imaging sessions, and all 3-D reconstructions were performed using identical methods. Shape similarity of free Achilles tendon reconstructed from MRI and 3-DUS data was assessed using Jaccard index, Hausdorff distance and root mean square error (RMSE). The Jaccard index, Hausdorff distance and RMSE values were 0.76 ± 0.05, 2.70 ± 0.70 and 0.61 ± 0.10 mm, respectively. The level of agreement between MRI and 3-DUS for free Achilles tendon volume, length and average cross-sectional area (CSA) was assessed using Bland-Altman analysis. Compared to MRI, freehand 3-DUS overestimated volume, length and average CSA by 30.6 ± 15.8 mm3 (1.1% ± 0.6%), 0.3 ± 0.7 mm (0.6% ± 1.9%) and 0.3 ± 1.42 mm2 (0.4% ± 2.0%), respectively. The upper and lower limits of agreement between MRI and 3-DUS for volume, length and average CSA were −0.4 to 61.7 mm3 (−0.2% to 2.3%), −1.0 to 1.5 mm (−3.2% to 4.5%) and −2.5 to 3.1 mm2 (−3.5% to 4.3%), respectively. There were no significant differences between imaging methods in CSA along the length of the tendon. In conclusion, MRI and freehand 3-DUS may be considered equivalent methods for estimating shape and 3-D geometry of the free Achilles tendon. These findings, together with the practical benefits of being able to assess 3-D Achilles tendon shape and geometry in a laboratory environment and under isometric loading, make 3-DUS an attractive alternative to MRI for assessing 3-D free Achilles tendon macro-structure in future studies. © 2019 World Federation for Ultrasound in Medicine & Biology

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

45

Issue

11

Start Page

2898

End Page

2905

Number of Pages

8

eISSN

1879-291X

ISSN

0301-5629

Publisher

Elsevier, US

Peer Reviewed

Yes

Open Access

No

Acceptance Date

24/07/2019

External Author Affiliations

Griffith University; QSCAN Radiology Clinics, Qld.; Australian Institute of Sport

Era Eligible

Yes

Journal

Ultrasound in Medicine and Biology