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Fig. 2. (A) Shifts in the orientation of the neutral axis (NA) of femoral bending
at five time increments (% of contact) through the step for four individual
cooters. Each data point represents the angle of the NA to the anatomical
anteroposterior (AP) axis of the femur averaged over N=3–6
steps. (B) Schematic femur cross section illustrating NA orientation and
shift. Strain gauge locations are indicated by the black bars around the
cortex of the femoral cross-section. Solid red line is an NA with an
orientation of 60°. Directions of bending are indicated with respect to
the anatomical axes of the bone as described in the text, not in an absolute
frame of reference. AP, bending about an NA running from the anatomical dorsal
to ventral cortex; DV, bending about an NA running from the anatomical
anterior to posterior cortex.