A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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-tekijät tai -toimittajat

van Dijk, Koen
Khair, Raad
Sukanen, Maria
Cronin, Neil
Juutinen, Taija

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: van Dijk, Koen; Khair, Raad M.; Sukanen, Maria; Cronin, Neil J.; Finni, Taija

Lehti tai sarja: Clinical Biomechanics

ISSN: 0268-0033

eISSN: 1879-1271

Julkaisuvuosi: 2023

Ilmestymispäivä: 03.05.2023

Volyymi: 105

Artikkelinumero: 105977

Kustantaja: Elsevier BV

Julkaisumaa: Alankomaat

Julkaisun kieli: englanti

DOI: https://doi.org/10.1016/j.clinbiomech.2023.105977

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/86862

Tiivistelmä

Background
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.

YSO-asiasanat: jänteet; kantajänne; vammat; kuntoutus; lihakset; biomekaniikka

Vapaat asiasanat: muscle; subtendon; resting length; heel-rise; non-operative treatment

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