Mechanical properties of the achilles tendon aponeurosis are altered in athletes with achilles tendinopathy

Child, Sally, Bryant, Adam L., Clark, Ross A. and Crossley, Kay M. (2010) Mechanical properties of the achilles tendon aponeurosis are altered in athletes with achilles tendinopathy. American Journal of Sports Medicine, 38 9: 1885-1893. doi:10.1177/0363546510366234

Author Child, Sally
Bryant, Adam L.
Clark, Ross A.
Crossley, Kay M.
Title Mechanical properties of the achilles tendon aponeurosis are altered in athletes with achilles tendinopathy
Journal name American Journal of Sports Medicine   Check publisher's open access policy
ISSN 0363-5465
Publication date 2010-09
Sub-type Article (original research)
DOI 10.1177/0363546510366234
Volume 38
Issue 9
Start page 1885
End page 1893
Total pages 9
Place of publication Thousand Oaks, CA, United States
Publisher Sage Publications
Language eng
Formatted abstract
Background: Achilles tendinopathy is a considerable problem for active people. The degenerative processes associated with tendinopathy may be associated with changes in the inherent mechanical properties of the musculotendinous unit.
Purpose: The purpose of this study was to compare Achilles tendon–aponeurosis strain between male athletes with and without Achilles tendinopathy.
Study Design: Cross-sectional study; Level of evidence, 3.
Methods: Fifteen healthy men (age, 35 ± 9 years; height, 1.78 ± 0.05 m; mass, 79 ± 11 kg) and 14 men with midportion Achilles tendinopathy (age, 40 ± 8 years; height, 1.77 ± 0.06 m; mass, 80 ± 9 kg) who were all running over 20 km per week participated in the study. Each participant was tested in a single session that involved maximal isometric plantar flexion efforts being performed on a calf-raise apparatus while synchronous real-time ultrasonography of the triceps surae aponeurosis was recorded. Achilles tendon–aponeurosis strain (%) was calculated by dividing tendon displacement during plantar flexion by resting tendon length (intrarater reliability: intraclass correlation coefficient = .92).
Results: Participants in the Achilles tendinopathy group (5.2% ± 2.6%) had significantly (P = .039) higher Achilles tendon–aponeurosis strain compared with the control group (3.4% ± 1.8%). In contrast, there were no significant between-group differences for maximal isometric plantar flexion force.
Conclusion: Achilles tendon–aponeurosis strain is higher in male athletes with tendinopathy than those without. The results of this study provide a rationale for current clinical approaches to management of Achilles tendinopathy, whereby repetitive mechanical loading may impart a positive benefit through reduced compliance of the musculotendinous unit.
Keyword Biomechanics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
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