Amirkabir University of Technology 1 article published in JoVE Engineering Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation Stanton Godshall1, Krishna Pedaprolu1, Erica Vasti1, Faezeh Eskandari2, Spencer E. Szczesny1,3 1Department of Biomedical Engineering, Pennsylvania State University, 2Department of Biomedical Engineering, Amirkabir University of Technology, 3Department of Orthopaedics and Rehabilitation, Pennsylvania State University This paper describes an open-source digital image correlation algorithm for measuring local 2D tissue strains within tendon explants. The accuracy of the technique has been validated using multiple techniques, and it is available for public use.