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

Rugg, S. G.; Gregor, R. J.; Mandelbaum, B. R.; Chiu, L.

Affiliations

¹Human Biomechanics Laboratory, Department of Kinesiology, University of California, Los Angeles, CA 90024-1568, U.S.A.

²Division of Orthopaedic Surgery, UCLA School of Medicine, Los Angeles, CA 90024-1568. U.S.A.

³Department of Radiology, UCLA Harbor Hospital, Los Angeles, CA 90024-1568, U.S.A.

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.

Links

DOI: 10.1016/0021-9290(90)90305-M

PubMed: 2373722

WoS: A1990DF91600012

History

Revised: 1989-03-10

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Cited By (28)

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2023	Diniz P, Quental C, Violindo P, Gomes JV, Pereira H, Kerkhoffs GMMJ, Ferreira FC, Folgado J. Design and validation of a finite element model of the aponeurotic and free achilles tendon. J Orthop Res. March 2023;41(3):534-545.
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