Fig. 8
From: Which experimental procedures influence the apparent proximal femoral stiffness? A parametric study
The 75% BW peak load resulted in relatively small displacements in the bone. Depending on the configuration, direction, and stiffness of the sample, the recorded values for marker displacements had different qualities. The example plots show instances with R2 values of the regression line of (a) 1.00 (0.9997), (b) 0.98, and (c) 0.02 corresponding to stance abduction, stance adduction, and fall abduction load cases of one sample, respectively. Applying a R2>0.95 threshold for the marker load-displacement data to be considered viable, apparent stiffness measures of Kb and Kz showed good correlation in (d) stance (R2 = 0.92) and (e) fall (R2 = 0.82) configurations