Achilles tendon moment arms are similar when computed using a single fixed axis versus a moving instantaneous helical axis

Wade, Francesca E.; Hickox, Lauren; Piazza, Stephen J.

doi:10.1016/j.jbiomech.2020.109907

Cited by 3 publications

(5 citation statements)

References 20 publications

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“…However, the rotation axis of the ankle joint with its six degrees of freedom is not in a fixed location but changes constantly 50 . Therefore, Wade et al 20,21 used an instantaneous axis of rotation derived from relative motions of the foot and shank segment to calculate the AT MA. Their results indicate that using a functional axis for ultrasound-based geometric estimates of AT MA shows a greater variation with changes in either joint angle or loading condition when compared to using anatomical landmarks (malleoli) to define the ankle's rotation axis 20 .…”

Section: Discussionmentioning

confidence: 99%

“…Their results indicate that using a functional axis for ultrasound-based geometric estimates of AT MA shows a greater variation with changes in either joint angle or loading condition when compared to using anatomical landmarks (malleoli) to define the ankle's rotation axis 20 . Still, using a fixed axis of ankle rotation www.nature.com/scientificreports/ might be preferable during dynamic movement, as it is applicable over a greater range of ankle motion 21 . Yet, despite those limitations, the UsKin method seems to be most promising for future in vivo studies as it is not limited by range of motion, accounts for inter-individual AT MA differences, and is sensitive to influences of joint rotation and varying contraction intensities.…”

Section: Discussionmentioning

confidence: 99%

“…Yet, despite those limitations, the UsKin method seems to be most promising for future in vivo studies as it is not limited by range of motion, accounts for inter-individual AT MA differences, and is sensitive to influences of joint rotation and varying contraction intensities. Rightfully so, this ultrasound-based geometric method has emerged to a common approach to determine the dynamic AT MA within recent years 17,[20][21][22][23][24][25]27 . Realistic calculation of TS forces is not only a prerequisite to determine physiological force-length data but also to determine realistic muscle properties including force-velocity relations and elastic properties of muscles from measured external reaction forces or joint torques [51][52][53] .…”

Section: Discussionmentioning

confidence: 99%

“…(3) A geometric imaging method using motion tracking and ultrasound (UsKin). Thereby, an ultrasound probe (calibrated in space) is used to track the AT line of action [16][17][18][19][20][21][22][23][24][25][26][27] . Similar to the Experimental setup.…”

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confidence: 99%

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Considerations on the human Achilles tendon moment arm for in vivo triceps surae muscle–tendon unit force estimates

Holzer

Paternoster

Hahn

et al. 2020

Sci Rep

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Moment arm-angle functions (MA-a-functions) are commonly used to estimate in vivo muscle forces in humans. However, different MA-a-functions might not only influence the magnitude of the estimated muscle forces but also change the shape of the muscle’s estimated force-angle relationship (F-a-r). Therefore, we investigated the influence of different literature based Achilles tendon MA-a-functions on the triceps surae muscle–tendon unit F-a-r. The individual in vivo triceps torque–angle relationship was determined in 14 participants performing maximum voluntary fixed-end plantarflexion contractions from 18.3° ± 3.2° plantarflexion to 24.2° ± 5.1° dorsiflexion on a dynamometer. The resulting F-a-r were calculated using 15 literature-based in vivo Achilles tendon MA-a-functions. MA-a-functions affected the F-a-r shape and magnitude of estimated peak active triceps muscle–tendon unit force. Depending on the MA-a-function used, the triceps was solely operating on the ascending limb (n = 2), on the ascending limb and plateau region (n = 12), or on the ascending limb, plateau region and descending limb of the F-a-r (n = 1). According to our findings, the estimated triceps muscle–tendon unit forces and the shape of the F-a-r are highly dependent on the MA-a-function used. As these functions are affected by many variables, we recommend using individual Achilles tendon MA-a-functions, ideally accounting for contraction intensity-related changes in moment arm magnitude.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Considerations on the human Achilles tendon moment arm for in vivo triceps surae muscle–tendon unit force estimates

Holzer

Paternoster

Hahn

et al. 2020

Sci Rep

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“…As one of the parameters of joint kinematics, the finite helical axis (FHA) of rotation has been used to describe joint motion for decades, especially in describing the motion of tibiofemoral joints [6] and ankle joints [7]. Unlike patellar tracking, the FHA is independent of the established coordinate system embedded in the "moving body" which can be directly applied to the analysis of joint forces and moments [8].…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Patellofemoral Finite Helical Axis and Femoral Trans-Epicondyle Axis Using a Static Magnetic Resonance-Based Methodology

Cai

Yang

et al. 2020

Preprint

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Background: To manage patellofemoral joint disorders, a complete understanding of the in vivo patellofemoral kinematics is critical. However, as one of the parameters of joint kinematics, the location and orientation of patellofemoral finite helical axis (FHA) remains unclear. The purpose of this study is to quantify the location and orientation of the patellar FHA both in vivo and non-invasively at various flexion angles and to relate the FHA to the trans-epicondyle axis (TEA).Methods: The Magnetic resonance (MR) images of 18 unilateral knees were collected at full extension and at 30°, 60°, 90°, and maximum angle of knee flexion. Three-dimensional models of knee joint at different flexion angles were developed with the MR images, and were used to calculate the patellar tracking and FHA with a spline interpolation algorithm. By using a coordinate system based on the TEA, the FHA tracking was quantified. Six parameters concerning the location and orientation of the patellar FHA were analyzed.Results: The average patellar FHA of 18 knees drew an L-shaped tracking on the midsagittal plane moving from the posteroinferior side of the TEA to the anterosuperior with knee flexion. Before 90° flexion, the patellar rotational radius decreased slightly, with an average value of 5.65 ± 1.09 cm. During 20° to 90° knee flexion, the average angle between the patellar FHA and TEA was approximately 10° and that between the FHA and coronal plane was maintained at about 0°, while that between the FHA and level plane fluctuated between -10° and 10°.Conclusions: Patellar FHA was not fixed during flexion, which showed a close relationship with femoral TEA in both location and orientation. The results could help us better understand the patellofemoral joint kinematics and further deal with troublesome patellofemoral disorders.

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Eulzer

Rockenfeller

Lawonn

2022

CHI Conference on Human Factors in Computing Systems

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Achilles tendon moment arms are similar when computed using a single fixed axis versus a moving instantaneous helical axis

Cited by 3 publications

References 20 publications

Considerations on the human Achilles tendon moment arm for in vivo triceps surae muscle–tendon unit force estimates

Considerations on the human Achilles tendon moment arm for in vivo triceps surae muscle–tendon unit force estimates

Relationship Between Patellofemoral Finite Helical Axis and Femoral Trans-Epicondyle Axis Using a Static Magnetic Resonance-Based Methodology

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