Relating in-vivo Strain of the Flexor Digitorum Superficialis Tendon with Grip Force

Author:

Houghton Frederick C.1,Huff Reece D.1,Earl Conner C.2,Ghajar-Rahimi Elnaz2,Dogra Ishan1,Darling Andrew J.2,Damen Frederick W.2,Zhou Guoyang2,Yu Denny3,Goergen Craig J.2,Harris-Adamson Carisa45,O’Connell Grace D.16

Affiliation:

1. Department of Mechanical Engineering, University of California, Berkeley, CA, USA

2. Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA

3. School of Industrial Engineering, Purdue University, West Lafayette, IN, USA

4. School of Public Health, University of California, Berkeley, CA, USA

5. Department of Occupational and Environmental Medicine, University of California, San Francisco

6. Department of Orthopaedic Surgery, University of California, San Francisco

Abstract

Epidemiological studies have shown a relationship between hand exertion and risk of developing distal upper extremity musculoskeletal disorders (DUEMSDs). Recently, fatigue-failure models were proposed for estimating the risk of DUEMSD development. However, models that incorporate tendon strain are primarily based on in-vitro data and may be better informed using in-vivo data. This methodological pilot study aimed to establish an approach for correlating grip force and spatiotemporal strains of the flexor digitorum superficialis (FDS) tendon using ultrasound imaging. Three image texture correlation techniques to measure in-vivo strains were explored and compared: digital image correlation, direct deformation estimation, and StrainNet, a novel deep learning neural network for strain prediction. StrainNet resulted in more accurate strain measurements than conventional image assessment tools, enabled continuous prediction of FDS tendon strain, and allowed for comparison of median bulk tissue strain during isometric contraction to grip force. Future work will study more participants and viscoelastic behavior.

Funder

National Institute for Occupational Safety and Health

National Institutes of Health

Publisher

SAGE Publications

Subject

General Medicine,General Chemistry

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