Table 1 Inclusion and exclusion criteria

• Passive dorsiflexion range of affected ankle of at least 5°

• History of uncontrolled seizure disorder

• Full passive knee extension bilaterally

• Orthopaedic lower limb surgery on the affected side in the past 12 months

• Dynamic popliteal angle of no more than 45°

• Orthopaedic metal ware at the site of electrical stimulation

• Able to cooperate with assessment procedures

• Botulinum toxin in lower limb in the past 3 months

• Willing to use the Walk Aide® at least 4 hours a day, 6 days a week for 8 weeks

• GMFCS I or II, unilateral spastic cerebral palsy (with or without dystonia)

• Aged between 5 and 18