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Abstract
Background: To provide insight into the relationship between muscle architecture, muscle strength and activity level in CP. Subjects and Methods: This study was conducted on forty subjects into two groups of equal number, group A includes twenty normal development children and adolescents and group B includes twenty cerebral palsy patients. All participated subjects examined for their rectus femoris muscle thickness and vastus lateralis muscle thickness by sonography, quadriceps muscle isometric peak torque measured by isokinetic dynamometer, activity level for group B only evaluated by pediatric outcome data collection instrument (parent report and self report). For group A evaluation conducted at start of the study and for group B the evaluation conducted for at start of the study and after six months of physical therapy program. Results: The obtained results showed direct relationship between muscle thickness measured by sonography and both muscle strength and activity level. Conclusion: muscle thickness measured by sonography can be used to evaluate muscle strength and activity level in cerebral palsy patient