What question did this study set out to answer?

To develop a sagittal-plane musculoskeletal model of the human lower extremity and analyze how muscle properties, tendon elasticity, and moment arms dictate the moment-angle relationships of 18 musculotendon actuators.

January 1, 1990Journal of BiomechanicsOpen Access

A musculoskeletal model of the human lower extremity: The effect of muscle, tendon, and moment arm on the moment-angle relationship of musculotendon actuators at the hip, knee, and ankle

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Authors

MHM.G. HoyUniversity of California, Los Angeles FZFelix E. ZajacNational Institute of Neurological Disorders and Stroke MGMichael E. GordonRutgers, The State University of New Jersey

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Implication

Biomechanical simulation study reveals complex moment-angle relationships across lower limb joints, indicating that omitting tendon properties skews predictions of human musculotendon function.

Key Points

To develop a sagittal-plane musculoskeletal model of the human lower extremity and analyze how muscle properties, tendon elasticity, and moment arms dictate the moment-angle relationships of 18 musculotendon actuators.
Constructed a computer simulation model of the human lower extremity defining musculoskeletal geometry and architectural parameters for 18 musculotendon actuators crossing the hip, knee, and ankle.
Calculated the active isometric joint moment generated by each actuator across a range of sagittal-plane joint angles, incorporating tendon slack length, optimal muscle-fiber length, and variable moment arms.
Actuators exhibited distinct tendon slack lengths, optimal muscle-fiber lengths, and moment arms, causing each to generate peak isometric moments at different joint angles.
The joint angle producing an actuator's peak moment did not regularly coincide with the angle of peak muscle force, peak moment arm, or maximum voluntary contraction moment measured in vivo.
Excluding tendon compliance from biomechanical evaluations resulted in erroneous predictions of musculotendon force and joint moment during both static positions and movement.

Cite This Study

Hoy et al. (1990) studied this question.

synapsesocial.com/papers/6aa2de0ba25963cecb13aba8 https://doi.org/10.1016/0021-9290(90)90349-8

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Implication

Biomechanical simulation study reveals complex moment-angle relationships across lower limb joints, indicating that omitting tendon properties skews predictions of human musculotendon function.

A musculoskeletal model of the human lower extremity: The effect of muscle, tendon, and moment arm on the moment-angle relationship of musculotendon actuators at the hip, knee, and ankle

Discussion

Member takes

Implication

Key Points

Cite This Study

A musculoskeletal model of the human lower extremity: The effect of muscle, tendon, and moment arm on the moment-angle relationship of musculotendon actuators at the hip, knee, and ankle

Discussion

Member takes

Implication

Key Points

Cite This Study

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