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Intraobserver reliability of SWE in seventy-six athletes with patellar tendinopathy. Bland-Altman plot illustrating the intraobserver reliability for the patellar tendon stiffness assessment using SWE. The differences between each pair of the stiffness measurements plotted on the y-axis are shown against the mean of these measurements on the x-axis. The solid line represents the mean value and dashed lines represent the limits of agreement, defined as mean ± 1.96SD
