A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Muscle-tendon morphomechanical properties of non-surgically treated Achilles tendon 1-year post-rupture (2022)

Khair, R. M., Stenroth, L., Cronin, N. J., Reito, A., Paloneva, J., & Finni, T. (2022). Muscle-tendon morphomechanical properties of non-surgically treated Achilles tendon 1-year post-rupture. Clinical Biomechanics, 92, Article 105568. https://doi.org/10.1016/j.clinbiomech.2021.105568

JYU-tekijät tai -toimittajat

Khair, Raad
Cronin, Neil
Juutinen, Taija

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Khair, Ra'ad M.; Stenroth, Lauri; Cronin, Neil J.; Reito, Aleksi; Paloneva, Juha; Finni, Taija

Lehti tai sarja: Clinical Biomechanics

ISSN: 0268-0033

eISSN: 1879-1271

Julkaisuvuosi: 2022

Volyymi: 92

Artikkelinumero: 105568

Kustantaja: Elsevier BV

Julkaisumaa: Alankomaat

Julkaisun kieli: englanti

DOI: https://doi.org/10.1016/j.clinbiomech.2021.105568

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/79546

Julkaisu on rinnakkaistallennettu: https://eprints.glos.ac.uk/10594/

Tiivistelmä

Background
Achilles tendon rupture appears to alter stiffness and length of the tendon. These alterations may affect the function of tendon in force transmission and in energy storage and recovery. We studied the mechanical properties of the Achilles' tendon post-rupture and their association with function.

Methods
Twenty-four (20 males, 4 females) participants (mean age: 43 y, 176 cm, 81 kg) were recruited. Ultrasonography and dynamometry were used to assess the muscle-tendon unit morphological and mechanical properties of non-surgically treated patients 1-year post rupture.

Findings
Injured tendons were longer with difference of 1.8 cm (95%CI: 0.5–1.9 cm; P < 0.001), and thicker by 0.2 mm (0.2–0.3 mm; P < 0.01). Medial gastrocnemius cross-sectional area was 1.0 cm2 smaller (0.8–1.1 cm2; P < 0.001), fascicles were 0.6 cm shorter (0.5–0.7 cm; P < 0.001) and pennation angle was 2.5° higher (1.3–3.6°; P < 0.001) when compared to the uninjured limb. We found no differences between injured and uninjured tendon stiffness 1-year post-rupture (mean difference: 29.8 N/mm, −7.7–67.3 N/mm; P = 0.170). The injured tendon showed 1.8 mm (1.2–2.4 mm; P < 0.01) lower elongation during maximal voluntary isometric contractions. Patient-reported functional outcome was related to the tendon resting length (β = 0.68, r(10) = 4.079, P = 0.002). Inter-limb differences in the medial gastrocnemius fascicle length were related to inter-limb differences in maximum contractions (β = 1.17, r(14) = 2.808, P = 0.014).

Interpretation
Longer Achilles tendon resting length was associated with poorer self-evaluated functional outcome. Although the stiffness of non-surgically treated and uninjured tendons was similar 1-year post rupture, plantar flexion strength deficit was still present, possibly due to shorter medial gastrocnemius fascicle length.

YSO-asiasanat: kantajänne; tuki- ja liikuntaelimet; raajat; vammat; ultraäänitutkimus; jäykkyys; itsearviointi