Robotic Knee Orthosis-assisted Walking in CP

The investigators will assess walking in each of the following conditions: shod (shoes or shoes + AFO) and RKO-assisted (shoes + RKO), to achieve the following: (1) Evaluate the effect of RKO, compared to shod upon endurance in children with CP at GMFCS level II, and (2) Evaluate the effect of RKO, compared to shod, upon temporal-spatial parameters, lower limb sagittal joint kinematics, and muscle EMG in children with CP at GMFCS level II.