Fig. 6
From: Impact on gait biomechanics of using an active variable impedance prosthetic knee
Plot of single subjects’ pelvis-torso (P-T) twist across the gait cycle for an individual who exhibited improved (decreased) pelvis-torso correlation due to using the VI Knee (a) and a participant who showed worsened (increased) P-T correlation while using the VI Knee (b) compared to the C-Leg. Ideally, the pelvis (black trace) and torso (blue and red traces) should be twisting in opposite directions over the gait cycle. Correlation for all subjects between pelvis and torso twist for steps taken with the intact side at 1 m/s (c), 1.25 m/s (c), and the affected side at 1 m/s (d) and 1.25 m/s (e). For sub-figures (c–f), significant (p ≤ 0.05) reductions (improved performance) in correlation are denoted by a star. Significant increases (worse performance) are noted by a circled star