A1 Journal article (refereed)
Medial gastrocnemius muscle fascicle function during heel-rise after non-operative repair of Achilles tendon rupture (2023)
van Dijk, K., Khair, R. M., Sukanen, M., Cronin, N. J., & Finni, T. (2023). Medial gastrocnemius muscle fascicle function during heel-rise after non-operative repair of Achilles tendon rupture. Clinical Biomechanics, 105, Article 105977. https://doi.org/10.1016/j.clinbiomech.2023.105977
JYU authors or editors
Publication details
All authors or editors: van Dijk, Koen; Khair, Raad M.; Sukanen, Maria; Cronin, Neil J.; Finni, Taija
Journal or series: Clinical Biomechanics
ISSN: 0268-0033
eISSN: 1879-1271
Publication year: 2023
Publication date: 03/05/2023
Volume: 105
Article number: 105977
Publisher: Elsevier BV
Publication country: Netherlands
Publication language: English
DOI: https://doi.org/10.1016/j.clinbiomech.2023.105977
Publication open access: Openly available
Publication channel open access: Partially open access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/86862
Abstract
To better understand muscle remodelling in dynamic conditions after an Achilles tendon rupture, this study examined the length of medial gastrocnemius muscle fascicles during a heel-rise at 6- and 12-months after non-operative ATR treatment.
Methods
Participants (15 M, 3F) were diagnosed with acute Achilles tendon rupture. Medial gastrocnemius subtendon length, fascicle length and pennation angle were assessed in resting conditions, and fascicle shortening during bi- and unilateral heel-rises.
Findings
Fascicle shortening was smaller on the injured side (mean difference [95% CI]: −9. 7 mm [−14.7 to −4.7 mm]; −11.1 mm [−16.5 to −5.8 mm]) and increased from 6- to 12 months (4.5 mm [2.8–6.3 mm]; 3.2 mm [1.4–4.9 mm]) in bi- and unilateral heel-rise, respectively. The injured tendon was longer compared to contralateral limb (2.16 cm [0.54–3.79 cm]) and the length decreased over time (−0.78 cm [−1.28 to −0.29 cm]). Tendon length correlated with fascicle shortening in bilateral (r = −0.671, p = 0.002; r = −0.666, p = 0.003) and unilateral (r = −0.773, p ≤ 0.001; r = −0.616, p = 0.006) heel-rise, at 6- and 12-months, respectively. In the injured limb, the change over time in fascicle shortening correlated with change in subtendon length in unilateral heel-rise (r = 0.544, p = 0.02).
Interpretation
This study showed that the lengths of the injured tendon and associated muscle can adapt throughout the first year after rupture when patients continue physiotherapy and physical exercises. For muscle, measures of resting length may not be very informative about adaptations, which manifest themselves during functional tasks such as unilateral heel-rise.
Keywords: tendons; calcaneal tendon; injuries and disabilities; rehabilitation; muscles; biomechanics
Free keywords: muscle; subtendon; resting length; heel-rise; non-operative treatment
Contributing organizations
Related projects
- Understanding restoration of Achilles Tendon function after rupture
- Juutinen, Taija
- Research Council of Finland
Ministry reporting: Yes
Reporting Year: 2023
Preliminary JUFO rating: 1