Evaluation of clinical manifestations includes measurement of side difference of angles in bilateral neck lateral flexion, rotation and habitual head position will performed using an arthrodial protractor by a trained member at the beginning of physical therapy and one month later, then every 2-3 months. Each measurement will be repeated 3 times to get the mean value. All cases will be followed for 1 and a half years, however, if the symptoms got completely recovery (the neck range of motion and position completely equal to sound side) or any complications resulting from the evaluation, the evaluation will be stopped.