Patient and method
The study was a prospective, randomized, controlled study. Sixty children from 12 to 18 years old of both sexes were recruited by envelope method from the pediatric laser clinics at the National Institute of Laser Enhanced Sciences in Cairo University (NILES) and the pediatric physical therapy clinic at the Faculty of Physical Therapy, Cairo University. It was approved by the ethical committee.Each participant and his parent was informed about the nature, aim, and benefits of the study and signed a consent or his gradient according to declaration of Helsinki. The patients were randomized into three equal groups by choosing from a closed envelope. The patient selects one of 60 closed envelops written in side it the method of treatment whether laser or ultrasound therapy or physiotherapy.