Trial reportAnnals of biomedical engineering2019
Ankle Rotation and Muscle Loading Effects on the Calcaneal Tendon Moment Arm: An In Vivo Imaging and Modeling Study.
Trial report in Annals of biomedical engineering, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
10 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Muscle Moment Arm-Joint Angle Relations in the Hip, Knee, and Ankle: A Visualization of Datasets.Annals of biomedical engineering · 2025Pooled it
- Reconstruction of Chronic Achilles Tendon Ruptures with Hamstring Autografts: Plantar Flexor Strength Is Preserved Despite Shortening of the Moment Arm.Journal of clinical medicine · 2026Article
- Reduced Achilles tendon stiffness in aging associates with higher metabolic cost of walking.Journal of applied physiology (Bethesda, Md. : 1985) · 2024Article
- Beyond Inverse Dynamics: Methods for Assessment of Individual Muscle Function during Gait.Bioengineering (Basel, Switzerland) · 2024Review
- The effects of plantarflexor weakness and reduced tendon stiffness with aging on gait stability.PloS one · 2024Article
- Does human foot anthropometry relate to plantar flexor fascicle mechanics and metabolic energy cost across various walking speeds?The Journal of experimental biology · 2023Article
- Simultaneous Quantification of Ankle, Muscle, and Tendon Impedance in Humans.IEEE transactions on bio-medical engineering · 2022Article
- Fit to Burst: Toward Noninvasive Estimation of Achilles Tendon Load Using Burst Vibrations.IEEE transactions on bio-medical engineering · 2021Article
- Considerations on the human Achilles tendon moment arm for in vivo triceps surae muscle-tendon unit force estimates.Scientific reports · 2020Article
- Older Adults Overcome Reduced Triceps Surae Structural Stiffness to Preserve Ankle Joint Quasi-Stiffness During Walking.Journal of applied biomechanics · 2020Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
Abstract
In this combined in vivo and computational modeling study, we tested the central hypothesis that ankle joint rotation and triceps surae muscle loading have independent and combinatory effects on the calcaneal (i.e., Achilles) tendon moment arm (CTma) that are not fully captured in contemporary musculoskeletal models of human movement. We used motion capture guided ultrasound imaging to estimate instantaneous variations in the CTma during a series of isometric and isotonic contractions compared to predictions from scaled, lower extremity computational models. As hypothesized, we found that muscle loading: (i) independently increased the CTma by up to 8% and (ii) attenuated the effects of ankle joint rotation, the latter likely through changes in tendon slack and tendon curvature. Neglecting the effects of triceps surae muscle loading in lower extremity models led to an underestimation of the CTma, on average, particularly in plantarflexion when those effects were most prominent. We also found little agreement between in vivo estimates and model predictions on an individual subject by subject basis, alluding to unaccounted for variation in anatomical morphology and thus fundamental limitations in model scaling. Together, these findings contribute to improving our understanding of the physiology of ankle moment and power generation and novel opportunities for model development.
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Registered trials
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