الفهرس 
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Abstract
Purpose of the study: investigate the effect of low level laser therapy in female patients suffering from chronic low back pain. Method: 60 female patients with low back pain. Divided to two equal groups their age ranges between 30- 45 years. The study group: received LLLT and exercise program. The control group: received placebo LLLT and the same exercise program. The usage laser was low level laser 910nm with energy 8J\cm2 and power density 140mw\cm2 for 15 sessions (3 times per week), from L4-L5 to S2-S3 in lumbo sacral region as well as the gluteal fascia, posterior sacroiliac ligaments, hamstrings and gastro-soleus muscles of which pain points were palpated from the low back to the foot Laser was applied 90sec. for each point the session totally was 20min. Assessment of pain was done before start of treatment , post two weeks(post I),end of treatment (post II)and follow up after one month (post III) using pressure algometer and Modified Oswestry Disability Questionnaire. Algometer is placed perpendicular to the tissue surface on lumbosacral region at same point at all measurement (take the measurement for three repetition and take their average) Pressure applied steadily at a constant rate. Exercise program was performed 3 days per week, for 5 weeks. Results: Data obtained from both groups regarding pressure pain threshold (PPT), and Modified Oswestry Disability Questionnaire (MODQ) revealed a significant difference in pressure pain threshold (PPT) between both groups. There was a significant increase in PPT of study group at post I, post II and post III compared with control group at all measurements and there was a significant decrease in MODQ of study group at post I, post II and post III compared with control group. Conclusion: Low level\ laser therapy decrease chronic low back pain and improve functional activity quality of life.