Date of download: 7/7/2016 Copyright © ASME. All rights reserved. From: The Effect of Size and Location of Tears in the Supraspinatus Tendon on Potential Tear Propagation J Biomech Eng. 2015;137(8): doi: / Geometry and boundary conditions. (a) Two lines of tears at 5 and 10 mm from the lateral surface (representing the tendon insertion) are defined. A tear will be placed at either the posterior (P), middle (M), or anterior (A) location. For the different sizes, the out tip of the tear will be constant for the posterior and anterior tears. For the middle tears, the midpoint will be constant across sizes. (b) The boundary conditions and representative mesh (8062 nodes and 36,670 four-noded tetrahedral elements). The lateral surface is fixed. A displacement is applied to the medial surface. Movement in the AP and bursal directions is also fixed at the medial surface. The mesh shows an initially zero thickness tear (8 mm long) in the middle location 5 mm from the lateral surface. Figure Legend:

Date of download: 7/7/2016 Copyright © ASME. All rights reserved. From: The Effect of Size and Location of Tears in the Supraspinatus Tendon on Potential Tear Propagation J Biomech Eng. 2015;137(8): doi: / Experimental versus simulated stress–strain curves. The dashed line shows the experimental response of a representative tendon in uniaxial tension. An 8 mm tear located in the anterior region 5 mm from the lateral edge was used to determine the material parameters (solid line). The extents of the shaded region show the range of the stress–strain response for all cases tested. The response for the one material case is shown with open triangles. Figure Legend:

Date of download: 7/7/2016 Copyright © ASME. All rights reserved. From: The Effect of Size and Location of Tears in the Supraspinatus Tendon on Potential Tear Propagation J Biomech Eng. 2015;137(8): doi: / Stress in the ML direction for tears 5 mm from the lateral edge. The stress contours have been scaled such that low stress regions are shown in black. There are large regions of low stress at the flanks of the tears. This region grows as the tear size increases. Further, the region lateral to the tear has significantly higher area than the region medial to the tear. Figure Legend:

Date of download: 7/7/2016 Copyright © ASME. All rights reserved. From: The Effect of Size and Location of Tears in the Supraspinatus Tendon on Potential Tear Propagation J Biomech Eng. 2015;137(8): doi: / Tendon with an 8 mm anterior tear 5 mm from the lateral edge. A stretch of 1.15 is applied to the medial edge. The contours show the ML strain component (a) and the ML stress component (b). Figure Legend:

Date of download: 7/7/2016 Copyright © ASME. All rights reserved. From: The Effect of Size and Location of Tears in the Supraspinatus Tendon on Potential Tear Propagation J Biomech Eng. 2015;137(8): doi: / Stress in the ML direction for tears 5 mm from the lateral edge with an applied stretch of The areas directly around the tear are shown. Significant stress concentrations are seen at the tips of the tear. The magnitude of the stress concentrations is not the same between anterior and posterior tips or between different tears. Figure Legend: