Figure 2

Absolute angle errors and error variability. A. Absolute angle errors for the hip and knee joints (mean ± SEM). Angle errors in subjects with SCI were greater than in AB subjects for both joints (P ≤ 0.001, repeated measures ANOVA). There were no significant differences in target angle or repetitions for either group. Angle errors are labeled by knee or hip target angle with respective positions at the other joint. The black and gray dots represent maximum and minimum absolute angle errors, respectively, across subjects for each target. Only one joint was tested at a time. B. Standard deviations of angle errors for the hip and knee joints (mean ± SEM). Subjects with SCI had higher standard deviations (were more variable) (P < 0.0001, repeated measures ANOVA) than in AB subjects. There were no significant differences in target angle or repetitions for either group. Angle error standard deviations are labeled by knee or hip target angle with respective positions at the other joint.