Skip to Main content Skip to Navigation
Journal articles

Contribution of Achilles tendon mechanical properties to torque steadiness in persons with transfemoral amputation

Abstract : Background: How Achilles tendon mechanics and plantar flexion strength and torque steadiness are altered in the intact leg of persons with trauma-related amputation is unknown. Understanding Achilles tendon mechanics following amputation will further inform rehabilitation approaches to enhance posture, balance, and force control. Objective: Conduct a pilot study to quantify plantar flexion maximal voluntary contraction torque, torque steadiness, and Achilles tendon mechanics in persons with unilateral trauma-related transfemoral amputation and controls without amputation. Study design: Cross-sectional study. Methods: Isometric plantar flexion maximal voluntary contractions were performed with the intact leg of ten males with transfemoral amputation (48 ± 14 years) and the dominant leg of age-matched male controls without amputation. Torque steadiness was calculated as the coefficient of variation in torque over 6 s during submaximal tracking tasks (5%, 10%, 25%, 50%, and 75% maximal voluntary contraction). Achilles tendon elongation and cross-sectional area were recorded with ultrasound to calculate strain, stress, and stiffness. Results: Maximal voluntary contraction and torque steadiness did not differ between persons with amputation (90.6 ± 31.6 N m, 3.7 ± 2.0%) and controls (95.8 ± 26.8 N m, 2.9 ± 1.2%; p > 0.05). Tendon stiffness (21.1 ± 18.2 N/mm) and strain (5.2 ± 1.3%) did not differ between groups (p > 0.05). Tendon cross-sectional area was 10% greater in persons with amputation leading to 29% lower stress (p = 0.021). Maximal voluntary contraction was a predictor of a lower coefficient of variation in torque (R2 = 0.11, p < 0.05). Conclusion: Persons with trauma-related transfemoral amputation do not differ in plantar flexion maximal voluntary contraction and torque steadiness of the intact leg compared with controls without amputation. Larger tendon cross-sectional area reduces stress and enables distribution of force across a greater area.
Document type :
Journal articles
Complete list of metadata

https://hal-uphf.archives-ouvertes.fr/hal-03463985
Contributor : Kathleen TORCK Connect in order to contact the contributor
Submitted on : Thursday, December 2, 2021 - 6:43:56 PM
Last modification on : Friday, April 1, 2022 - 3:56:21 AM

Identifiers

Collections

Citation

Anis Toumi, Rowan Smart, Dimitri Elie, Jennifer Bassement, Sebastien Leteneur, et al.. Contribution of Achilles tendon mechanical properties to torque steadiness in persons with transfemoral amputation. Prosthetics and Orthotics International, SAGE Publications, 2021, 45 (2), pp.170-177. ⟨10.1177/0309364620966431⟩. ⟨hal-03463985⟩

Share

Metrics

Record views

13