Joint kinematics of the left hip for all subjects. Zero degrees is the point at which the left crank arm was horizontal and farthest from the subject, as shown in Figure 2. Qualitative differences are evident, demonstrating the differences in magnitude and timing between groups and cadences. Subjects with cerebral palsy (CP) had greater excursions of motion in the frontal and transverse planes, greater hip flexion, greater knee extension, and greater dorsiflexion compared with the subjects with typical development (TD). The positive direction indicates flexion, adduction, and medial (internal) rotation for sagittal, frontal, and transverse planes, respectively. Flex=flexion, Add=adduction, Abd=abduction, MR=medial rotation, LR=lateral (external) rotation. TD30=subjects with TD at cadence of 30 rpm, CP30=subjects with CP at cadence of 30 rpm, TD60=subjects with TD at cadence of 60 rpm, CP60=subjects with CP at cadence of 60 rpm.