Control group: received a designed physical therapy program

experimental group: received a designed physical therapy program in addition to WBV for 12 weeks

On a vibration platform, the children went into a complete squat. The device was calibrated at a frequency of 30 Hz, an amplitude of 2 mm, and a duration of 5 minutes. After the vibration was turned on, the children were told to stay in the squatting position and to report any discomfort that could occur. The vibration automatically shut off after five minutes. The children then rested for a minute. Next, under the identical conditions as for the squatting position, they were instructed to stand on the vibration platform for five minutes with the therapist's assistance. Consequently, WBV was applied for a total of 10 minutes during each session.

Each child in both groups had their knee joint's extension angle measured before and after a 12-week therapy program began using an absolute + AxisTM Digital Goniometer

The biceps femoris muscle's muscle fascicle length was measured at a frequency of 7.5 MHz using GE LOGIQ P6 ultrasonography equipment

Gross Motor Functional Measurement-88 : is a common principle-test designed to assess changes in function in various milestones for children with cerebral palsy 0 = does not initiate

1. = initiates
2. = partially completes
3. = completes