Abstract
Musculoskeletal models of the cervical spine commonly represent neck muscles with straight paths. However, straight lines do not best represent the natural curvature of muscle paths in the neck, because the paths are constrained by bone and soft tissue. The purpose of this study was to estimate moment arms of curved and straight neck muscle paths using different moment arm calculation methods: tendon excursion, geometric, and effective torque. Curved and straight muscle paths were defined for two subject-specific cervical spine models derived from in vivo magnetic resonance images (MRI). Modeling neck muscle paths with curvature provides significantly different moment arm estimates than straight paths for 10 of 15 neck muscles (p < 0.05, repeated measures two-way ANOVA). Moment arm estimates were also found to be significantly different among moment arm calculation methods for 11 of 15 neck muscles (p < 0.05, repeated measures two-way ANOVA). In particular, using straight lines to model muscle paths can lead to overestimating neck extension moment. However, moment arm methods for curved paths should be investigated further, as different methods of calculating moment arm can provide different estimates.
Similar content being viewed by others
References
Ackland, D., J. Merritt, and M. Pandy. Moment arms of the human neck muscles in flexion, bending and rotation. J. Biomech. 44(3):475–486, 2010.
An, K. N., K. Takahashi, T. P. Harrigan, and E. Y. Chao. Determination of muscle orientations and moment arms. J. Biomech. Eng. 106:280–282, 1984.
Arjmand, N., A. Shirazi-Adl, and B. Bazrgari. Wrapping of trunk thoracic extensor muscles influences muscle forces and spinal loads in lifting tasks. Clin. Biomech. (Bristol, Avon) 21:668–675, 2006.
Arnold, A. S., S. Salinas, D. J. Asakawa, and S. L. Delp. Accuracy of muscle moment arms estimated from MRI-based musculoskeletal models of the lower extremity. Comput. Aided Surg. 5:108–119, 2000.
Chancey, V. C., R. W. Nightingale, C. A. Van Ee, K. E. Knaub, and B. S. Myers. Improved estimation of human neck tensile tolerance: reducing the range of reported tolerance using anthropometrically correct muscles and optimized physiologic initial conditions. Stapp Car Crash J. 47:135–153, 2003.
Cox, C. A., A. T. Dibb, H. C. Cutcliffe, R. W. Nightingale, B. S. Myers, A. N. Vasavada, B. L. Suderman and C. R. Bass. The influence of muscle modeling methods and paths on head and neck response. In: 11th World Congress on Computational Mechanics, Barcelona, Spain, 2014.
Delp, S., F. Anderson, A. Arnold, P. Loan, A. Habib, C. John, E. Guendelman, and D. Thelen. OpenSim: open-source software to create and analyze dynamic simulations of movement. IEEE Trans. Biomed. Eng. 54:1940–1950, 2007.
Delp, S. L., W. E. Hess, D. S. Hungerford, and L. C. Jones. Variation of rotation moment arms with hip flexion. J. Biomech. 32:493–501, 1999.
Delp, S. L., and J. P. Loan. A graphics-based software system to develop and analyze models of musculoskeletal structures. Comput. Biol. Med. 25:21–34, 1995.
Dugailly, P. M., S. Sobczak, F. Moiseev, V. Sholukha, P. Salvia, V. Feipel, M. Rooze, and S. Van Sint. Musculoskeletal modeling of the suboccipital spine: kinematics analysis, muscle lengths, and muscle moment arms during axial rotation and flexion extension. Spine 36:E413, 2011.
Fowler, N. K., A. C. Nicol, B. Condon, and D. Hadley. Method of determination of three dimensional index finger moment arms and tendon lines of action using high resolution MRI scans. J. Biomech. 34:791–797, 2001.
Gordon, C. C., T. Churchill, C. E. Clauser, B. Bradtmiller, J. T. McConville, and R. A. Walker. 1988 Anthropometric Survey of US Army Personnel: Methods and Summary Statistics, 1989.
Hwang, J., J. S. Dufour, G. G. Knapik, T. M. Best, S. N. Khan, E. Mendel, and W. S. Marras. Prediction of magnetic resonance imaging-derived trunk muscle geometry with application to spine biomechanical modeling. Clin. Biomech. (Bristol, Avon) 37:60–64, 2016.
Hwang, J., G. G. Knapik, J. S. Dufour, and W. S. Marras. Curved muscles in biomechanical models of the spine: a systematic literature review. Ergonomics 60(4):577–588, 2016.
Ingram, D., C. Engelhardt, A. Farron, A. Terrier, and P. Mullhaupt. Muscle moment-arms: a key element in muscle-force estimation. Comput. Methods Biomech. Biomed. Eng. 18:506–513, 2015.
Jaeger, R., F. Mauch, and B. Markert. The muscle line of action in current models of the human cervical spine: a comparison with in vivo MRI data. Comput. Methods Biomech. Biomed. Eng. 15:953–961, 2012.
Jensen, R., and D. Davy. An investigation of muscle lines of action about the hip: a centroid line approach vs the straight line approach. J. Biomech. 8:103–110, 1975.
Kruidhof, J., and M. G. Pandy. Effect of muscle wrapping on model estimates of neck muscle strength. Comput. Methods Biomech. Biomed. Eng. 9:343–352, 2006.
Lee, S. W., H. Chen, J. D. Towles, and D. G. Kamper. Estimation of the effective static moment arms of the tendons in the index finger extensor mechanism. J. Biomech. 41:1567–1573, 2008.
Menegaldo, L. L., A. de Toledo Fleury, and H. I. Weber. Moment arms and musculotendon lengths estimation for a three-dimensional lower-limb model. J. Biomech. 37:1447–1453, 2004.
Murray, W. M., S. L. Delp, and T. S. Buchanan. Variation of muscle moment arms with elbow and forearm position. J. Biomech. 28:513–525, 1995.
Nevins, D. D., L. Zheng, and A. N. Vasavada. Inter-individual variation in vertebral kinematics affects predictions of neck musculoskeletal models. J. Biomech. 47:3288–3294, 2014.
Oi, N., M. G. Pandy, B. S. Myers, R. W. Nightingale, and V. C. Chancey. Variation of neck muscle strength along the human cervical spine. Stapp Car Crash J. 48:397–417, 2004.
Pal, S., J. E. Langenderfer, J. Q. Stowe, P. J. Laz, A. J. Petrella, and P. J. Rullkoetter. Probabilistic modeling of knee muscle moment arms: effects of methods, origin-insertion, and kinematic variability. Ann. Biomed. Eng. 35:1632–1642, 2007.
Pandy, M. G. Moment arm of a muscle force. Exerc. Sport Sci. Rev. 27:79–118, 1999.
Panjabi, M. Centers and angles of rotation of body joints: a study of errors and optimization. J. Biomech. 12:911–920, 1979.
Sherman M. A., A. Seth and S. L. Delp. What is a moment arm? Calculating muscle effectiveness in biomechanical models using generalized coordinates. Proceedings of the ASME Design Engineering Technical Conferences, 2013.
Siegler, S., P. Allard, C. Kirtley, A. Leardini, D. Rosenbaum, M. Whittle, D. D’Lima, L. Cristofolini, H. Witte, and O. Schmid. ISB recommendation on definitions of joint coordinate system of various joints for the reporting of human joint motion: part I: ankle, hip, and spine. J. Biomech. 35:543–548, 2002.
Suderman B. L. The effect of curvature on neck muscle moment arms. Doctoral Dissertation: Mechanical Engineering. Pullman, WA: Washington State University, 2012, p. 139.
Suderman, B. L., B. Krishnamoorthy, and A. N. Vasavada. Neck muscle paths and moment arms are significantly affected by wrapping surface parameters. Comput. Methods Biomech. Biomed. Eng. 15:735–744, 2012.
Suderman, B. L., and A. N. Vasavada. Moving muscle points provide accurate curved muscle paths in a model of the cervical spine. J. Biomech. 45:400–404, 2012.
van Lopik, D. W., and M. Acar. Development of a multi-body computational model of human head and neck. J. Multi-Body Dyn. 221:175–197, 2007.
Vasavada, A. N., R. A. Lasher, T. E. Meyer, and D. C. Lin. Defining and evaluating wrapping surfaces for MRI-derived spinal muscle paths. J. Biomech. 41:1450–1457, 2008.
Vasavada, A. N., S. Li, and S. L. Delp. Influence of muscle morphometry and moment arms on the moment-generating capacity of human neck muscles. Spine (Phila Pa 1976) 23:412–422, 1998.
Wilson, D. L., Q. Zhu, J. L. Duerk, J. M. Mansour, K. Kilgore, and P. E. Crago. Estimation of tendon moment arms from three-dimensional magnetic resonance images. Ann. Biomed. Eng. 27:247–256, 1999.
Zheng, L., G. Siegmund, G. Ozyigit, and A. Vasavada. Sex-specific prediction of neck muscle volumes. J. Biomech. 46:899–904, 2013.
Acknowledgments
This research supported by NSF (CBET #0748303) and the National Center for Skeletal Muscle Research. We would like to thank the University of British Columbia MRI Research Centre, Gunter Siegmund and Jean-Sébastien Blouin for assistance with MRI scans, and Michael Sherman and Ajay Seth for their insightful discussion.
Conflict of Interest
No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Author information
Authors and Affiliations
Corresponding author
Additional information
Associate Editor Joel D. Stitzel oversaw the review of this article.
Rights and permissions
About this article
Cite this article
Suderman, B.L., Vasavada, A.N. Neck Muscle Moment Arms Obtained In-Vivo from MRI: Effect of Curved and Straight Modeled Paths. Ann Biomed Eng 45, 2009–2024 (2017). https://doi.org/10.1007/s10439-017-1830-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10439-017-1830-8