A simple but reliable method for measuring 3D Achilles tendon moment arm geometry from a single, static magnetic resonance scan

C. F. Alexander, I. Lum, S. Reid, E. Clarke, K. Stannage, A. El-Sallam Abd, Rob D. Herbert, C. J. Donnelly

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Current methods for measuring in vivo 3D muscle-tendon moment arms generally rely on the acquisition of magnetic resonance imaging (MRI) scans at multiple joint angles. However, for patients with musculoskeletal pathologies such as fixed contractures, moving a joint through its full range of motion is not always feasible. The purpose of this research was to develop a simple, but reliable in vivo 3D Achilles tendon moment arm (ATMA) technique from a single static MRI scan. To accomplish this, for nine healthy adults (5 males, 4 females), the geometry of a cylinder was fit to the 3D form of the talus dome, which was used to estimate the talocrural flexion/extension axis, and a fifth-order polynomial fit to the line of action of the Achilles tendon. The single static scan in vivo 3D ATMA estimates were compared to estimates obtained from the same subjects at the same ankle joint angles using a previously validated 3D dynamic MRI based in vivo ATMA measurement technique. The ATMA estimates from the single scan in vivo 3D method (52.5. mm. ±. 5.6) were in excellent agreement (ICC = 0.912) to the validated in vivo 3D method (51.5. mm. ±. 5.1). These data show reliable in vivo 3D ATMA can be obtained from a single MRI scan for healthy adult populations. The single scan, in vivo 3D ATMA technique provides researchers with a simple, but reliable method for obtaining subject-specific ATMAs for musculoskeletal modelling purposes. ©2017 Elsevier Ltd. All rights reserved

    Original languageEnglish
    Pages (from-to)134-138
    Number of pages5
    JournalJournal of Biomechanics
    Volume55
    DOIs
    Publication statusPublished - 11 Apr 2017

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    Achilles Tendon
    Tendons
    Magnetic resonance
    Magnetic Resonance Spectroscopy
    Geometry
    Magnetic Resonance Imaging
    Imaging techniques
    Joints
    Talus
    Ankle Joint
    Contracture
    Articular Range of Motion
    Domes
    Pathology
    Muscle
    Research Personnel
    Polynomials
    Muscles
    Research
    Population

    Cite this

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    title = "A simple but reliable method for measuring 3D Achilles tendon moment arm geometry from a single, static magnetic resonance scan",
    abstract = "Current methods for measuring in vivo 3D muscle-tendon moment arms generally rely on the acquisition of magnetic resonance imaging (MRI) scans at multiple joint angles. However, for patients with musculoskeletal pathologies such as fixed contractures, moving a joint through its full range of motion is not always feasible. The purpose of this research was to develop a simple, but reliable in vivo 3D Achilles tendon moment arm (ATMA) technique from a single static MRI scan. To accomplish this, for nine healthy adults (5 males, 4 females), the geometry of a cylinder was fit to the 3D form of the talus dome, which was used to estimate the talocrural flexion/extension axis, and a fifth-order polynomial fit to the line of action of the Achilles tendon. The single static scan in vivo 3D ATMA estimates were compared to estimates obtained from the same subjects at the same ankle joint angles using a previously validated 3D dynamic MRI based in vivo ATMA measurement technique. The ATMA estimates from the single scan in vivo 3D method (52.5. mm. ±. 5.6) were in excellent agreement (ICC = 0.912) to the validated in vivo 3D method (51.5. mm. ±. 5.1). These data show reliable in vivo 3D ATMA can be obtained from a single MRI scan for healthy adult populations. The single scan, in vivo 3D ATMA technique provides researchers with a simple, but reliable method for obtaining subject-specific ATMAs for musculoskeletal modelling purposes. {\circledC}2017 Elsevier Ltd. All rights reserved",
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    author = "Alexander, {C. F.} and I. Lum and S. Reid and E. Clarke and K. Stannage and {El-Sallam Abd}, A. and Herbert, {Rob D.} and Donnelly, {C. J.}",
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    A simple but reliable method for measuring 3D Achilles tendon moment arm geometry from a single, static magnetic resonance scan. / Alexander, C. F.; Lum, I.; Reid, S.; Clarke, E.; Stannage, K.; El-Sallam Abd, A.; Herbert, Rob D.; Donnelly, C. J.

    In: Journal of Biomechanics, Vol. 55, 11.04.2017, p. 134-138.

    Research output: Contribution to journalArticle

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    AU - Alexander, C. F.

    AU - Lum, I.

    AU - Reid, S.

    AU - Clarke, E.

    AU - Stannage, K.

    AU - El-Sallam Abd, A.

    AU - Herbert, Rob D.

    AU - Donnelly, C. J.

    PY - 2017/4/11

    Y1 - 2017/4/11

    N2 - Current methods for measuring in vivo 3D muscle-tendon moment arms generally rely on the acquisition of magnetic resonance imaging (MRI) scans at multiple joint angles. However, for patients with musculoskeletal pathologies such as fixed contractures, moving a joint through its full range of motion is not always feasible. The purpose of this research was to develop a simple, but reliable in vivo 3D Achilles tendon moment arm (ATMA) technique from a single static MRI scan. To accomplish this, for nine healthy adults (5 males, 4 females), the geometry of a cylinder was fit to the 3D form of the talus dome, which was used to estimate the talocrural flexion/extension axis, and a fifth-order polynomial fit to the line of action of the Achilles tendon. The single static scan in vivo 3D ATMA estimates were compared to estimates obtained from the same subjects at the same ankle joint angles using a previously validated 3D dynamic MRI based in vivo ATMA measurement technique. The ATMA estimates from the single scan in vivo 3D method (52.5. mm. ±. 5.6) were in excellent agreement (ICC = 0.912) to the validated in vivo 3D method (51.5. mm. ±. 5.1). These data show reliable in vivo 3D ATMA can be obtained from a single MRI scan for healthy adult populations. The single scan, in vivo 3D ATMA technique provides researchers with a simple, but reliable method for obtaining subject-specific ATMAs for musculoskeletal modelling purposes. ©2017 Elsevier Ltd. All rights reserved

    AB - Current methods for measuring in vivo 3D muscle-tendon moment arms generally rely on the acquisition of magnetic resonance imaging (MRI) scans at multiple joint angles. However, for patients with musculoskeletal pathologies such as fixed contractures, moving a joint through its full range of motion is not always feasible. The purpose of this research was to develop a simple, but reliable in vivo 3D Achilles tendon moment arm (ATMA) technique from a single static MRI scan. To accomplish this, for nine healthy adults (5 males, 4 females), the geometry of a cylinder was fit to the 3D form of the talus dome, which was used to estimate the talocrural flexion/extension axis, and a fifth-order polynomial fit to the line of action of the Achilles tendon. The single static scan in vivo 3D ATMA estimates were compared to estimates obtained from the same subjects at the same ankle joint angles using a previously validated 3D dynamic MRI based in vivo ATMA measurement technique. The ATMA estimates from the single scan in vivo 3D method (52.5. mm. ±. 5.6) were in excellent agreement (ICC = 0.912) to the validated in vivo 3D method (51.5. mm. ±. 5.1). These data show reliable in vivo 3D ATMA can be obtained from a single MRI scan for healthy adult populations. The single scan, in vivo 3D ATMA technique provides researchers with a simple, but reliable method for obtaining subject-specific ATMAs for musculoskeletal modelling purposes. ©2017 Elsevier Ltd. All rights reserved

    KW - Ankle

    KW - In vivo

    KW - Modelling

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    DO - 10.1016/j.jbiomech.2017.01.038

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