Robot-assisted gait training (RAGT) can provide a longer training duration with a higher repetition of stepping while maintaining a stable pattern of movement. However, the existing evidence of its effectiveness is not clear. The aim of this study is to investigate the feasibility and the effect of increased frequency (4 times per week) of RAGT compared to the most common frequency (2 times per week). we hypothesize that increased frequency of RAGT will result in greater improvements on the gait functions. This research will investigate the effect of increased frequency on robotic assisted gait training (RAGT) in a frequency of 4 times per a week, and will compare the effect of robotic assisted gait training (RAGT) with increased frequency and with usual frequency (2 times per a week) in regards with gait functional parameters such as balance, speed, endurance, and quality of gait among cerebral palsy (CP) children's.

Cerebral palsy (CP) is defined as a group of disorders that affect mobility and posture with heterogeneous impairments such as muscle tone alternation, reduced selective motor control, joint contracture, postural control impairment and weakness of muscles. Independent walking is a priority goal for a lot of parents and children with CP.

RAGT has been considered as a revolutionary technology for gait enhancement. Lokomat, as one of RAGT devices, provides the intensive gait training with a number of repetitions of stepping while it preserves consistent pattern of movement. Lokomat with additional virtual reality games adds fun and challenge and enhances the involvement and motivation throughout the whole session. We will use Lokomat for RAGT for 6 weeks phase for both treatement and control groups. Only difference between groups is the frequency: 4 times a week for treatment group and 2 times a week for intervention group.

General gait and standing function will be measured by Gross motor function measure dimension E and D. Speed, endurance, balance, and quality of gait would be measured by 10 meter walk test, 6 minutes walk test, pediatric balance scale, and Edinburgh visual gait score. To our knowledge no previous studies investigated the effect of the increased frequency in RAGT with lokomat on improving gait speed, endurance, balance and quality in children with CP.

Inclusion Criteria:

• children with spastic diplegia; being able to walk independently with or without using walking aids on at least 10 meters; classified as level Ι, II and ΙΙΙ in the gross motor function classification system (GMFCS).
• Children who can follow instructions of gross motor function measure (GMFM) testing and able to express discomfort and pain by verbal or nonverbal signs, having required range for lokomat (hip and knee flexion contracture ≤10°, knee valgus ≤40°, femur length ≥ 23 cm).

Exclusion Criteria:

• If they received botulinum toxin injections or underwent surgical intervention at least a year before the 6-week of the intervention or participated in another Lokomat training regime within the last 3 months.
• If they have: (a) fixed contractures and/or with bone instability; (b) seizure disorder that is not controlled by medication (if on medication, must not have had a seizure in the last 12 months); (c) baclofen infusion pumps in situ, open skin lesions and vascular disorder of lower extremities.

There is a plan to make individual parrticipant data and related data dictionaries available.

After 6 months and will become availbel for one year

Not identified yet

Outcome measure assessor will be blinded to the allocation. The child performance will be recorded and the score will be obtained by another assessor who is not aware about the date of the recorded video and not knowing of the allocation.