A 3D model of the Achilles tendon to determine the mechanisms underlying nonuniform tendon displacements

JOURNAL OF BIOMECHANICS

卷:51

Article

Handsfield, Geoffrey G.^1,2  Inouye, Joshua M.¹  Slane, Laura C.^3,4  Thelen, Darryl G.^3,5  Miller, G. Wilson⁶  Blemker, Silvia S.^1,7,8 

[1] Univ Virginia, Dept Biomed Engn, Charlottesville, VA 22903 USA

[2] Univ Auckland, Auckland Bioengn Inst, Auckland, New Zealand

[3] Univ Wisconsin, Dept Biomed Engn, Madison, WI 53706 USA

[4] Katholieke Univ Leuven, Inst Orthopaed Res & Training, Leuven, Belgium

[5] Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA

[6] Univ Virginia, Dept Radiol & Med Imaging, Charlottesville, VA 22903 USA

[7] Univ Virginia, Dept Orthopaed Surg, Charlottesville, VA 22903 USA

[8] Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22903 USA

关键词: Finite element;    Computational model;    MRI;    Soft tissue;    Connective tissue;   

DOI  :  10.1016/j.jbiomech.2016.11.062

来源: Elsevier

【 摘 要 】

The Achilles is the thickest tendon in the body and is the primary elastic energy-storing component during running. The form and function of the human Achilles is complex: twisted structure, intratendinous interactions, and differential motor control from the triceps surae muscles make Achilles behavior difficult to intuit. Recent in vivo imaging of the Achilles has revealed nonuniform displacement patterns that are not fully understood and may result from complex architecture and musculotendon interactions. In order to understand which features of the Achilles tendon give rise to the nonuniform deformations observed in vivo, we used computational modeling to predict the mechanical contributions from different features of the tendon. The aims of this study are to: (i) build a novel computational model of the Achilles tendon based on ultrashort echo time MRI, (ii) compare simulated displacements with published in vivo ultrasound measures of displacement, and (iii) use the model to elucidate the effects of tendon twisting, intratendon sliding, retrocalcaneal insertion, and differential muscle forces on tendon deformation. Intratendon sliding and differential muscle forces were found to be the largest factors contributing to displacement nonuniformity between tendon regions. Elimination of intratendon sliding or muscle forces reduced displacement nonuniformity by 96% and 85%, respectively, while elimination of tendon twist and the retrocalcaneal insertion reduced displacement nonuniformity by only 35% and 3%. These results suggest that changes in the complex internal structure of the tendon alter the interaction between muscle forces and tendon behavior and therefore may have important implications on muscle function during movement. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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