This study was designed to evaluate the efficacy of physical therapy for patients with low back pain (LBP). 90 cases were classified into 4 groups, for low back pain appeared on flexion in standing and extension in standing. A clinical evaluation was carried out using the Visual Analogue scale (VAS) for LBP; Japanese Orthopedic Association Score (JOA score) .The data was collected at the initial consultation and after 1 month and after 2 month. As a result, The mean scores of VAS improved at the 1 month's , but the mean scores of JOA score unchanged at the 2 month's evaluation. McKenzie's extension exercise was effective on the improvement of VAS and ADL score. It is suggested that there is need for over 2 month's follow up. It is important for efficient therapeutic exercise of the LBP patients to evaluation of symptoms.
