In vivo moment arm calculations at the ankle using magnetic resonance imaging (MRI)

In vivo moment arm lengths for the Achilles tendon and tibialis anterior (TA) were determined in 10 adult male subjects. Moment arms were measured as the perpendicular distance between the joint center of rotation (CR) and the center of the muscle's tendon on a series of sagittal plane magnetic...

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Published in:Journal of biomechanics Vol. 23; no. 5; p. 495
Main Authors: Rugg, S G, Gregor, R J, Mandelbaum, B R, Chiu, L
Format: Journal Article
Language:English
Published: United States 1990
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Abstract In vivo moment arm lengths for the Achilles tendon and tibialis anterior (TA) were determined in 10 adult male subjects. Moment arms were measured as the perpendicular distance between the joint center of rotation (CR) and the center of the muscle's tendon on a series of sagittal plane magnetic resonance images. The first set of calculations used a fixed CR and the second a moving CR. The position of the CR was determined using a modification of the graphical method of Reuleaux. For both moving and fixed CR conditions, moment arms increased by approximately 20% for the Achilles tendon and decreased by approximately 30% for the TA when the ankle moved from maximum dorsiflexion to maximum plantarflexion. Moment arms averaged 3.1% greater for the Achilles tendon and 2.5% greater for the TA when calculated using a fixed CR. These data suggest that the averaged moment arm lengths for the Achilles tendon and the TA were relatively unaffected by the use of a fixed vs moving CR.
AbstractList In vivo moment arm lengths for the Achilles tendon and tibialis anterior (TA) were determined in 10 adult male subjects. Moment arms were measured as the perpendicular distance between the joint center of rotation (CR) and the center of the muscle's tendon on a series of sagittal plane magnetic resonance images. The first set of calculations used a fixed CR and the second a moving CR. The position of the CR was determined using a modification of the graphical method of Reuleaux. For both moving and fixed CR conditions, moment arms increased by approximately 20% for the Achilles tendon and decreased by approximately 30% for the TA when the ankle moved from maximum dorsiflexion to maximum plantarflexion. Moment arms averaged 3.1% greater for the Achilles tendon and 2.5% greater for the TA when calculated using a fixed CR. These data suggest that the averaged moment arm lengths for the Achilles tendon and the TA were relatively unaffected by the use of a fixed vs moving CR.
Author Mandelbaum, B R
Chiu, L
Gregor, R J
Rugg, S G
Author_xml – sequence: 1
  givenname: S G
  surname: Rugg
  fullname: Rugg, S G
  organization: Department of Kinesiology, University of California, Los Angeles 90024-1568
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  givenname: R J
  surname: Gregor
  fullname: Gregor, R J
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  givenname: B R
  surname: Mandelbaum
  fullname: Mandelbaum, B R
– sequence: 4
  givenname: L
  surname: Chiu
  fullname: Chiu, L
BackLink https://www.ncbi.nlm.nih.gov/pubmed/2373722$$D View this record in MEDLINE/PubMed
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Snippet In vivo moment arm lengths for the Achilles tendon and tibialis anterior (TA) were determined in 10 adult male subjects. Moment arms were measured as the...
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SubjectTerms Achilles Tendon - anatomy & histology
Achilles Tendon - physiology
Adult
Ankle Joint - anatomy & histology
Ankle Joint - physiology
Anthropometry
Biomechanical Phenomena
Humans
Magnetic Resonance Imaging
Male
Movement - physiology
Muscles - anatomy & histology
Muscles - physiology
Rotation
Title In vivo moment arm calculations at the ankle using magnetic resonance imaging (MRI)
URI https://www.ncbi.nlm.nih.gov/pubmed/2373722
Volume 23
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