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Background: It is estimated that 30%-50% of women will suffer an osteoporotic fracture in their lifetime. Laser therapy has a positive effect on bone regeneration and healing that is dependent on the parameters of the light itself, eg. intensity and wavelength. Objective: The aim of the present study was to compare the possible effect of high intensity laser therapy (HILT) with Low level laser therapy (LLLT) on bone mineral density (BMD) of lumbar vertebrae in postmenopausal women with osteoporosis. Methods: Thirty postmenopausal osteoporotic women participated in this study. They were randomly divided in to two groups. Group (I) consists of 15 women received HLLT, Group (II) consists of 15 women received LLLT. Both groups were treated three sessions per week for six successive weeks. Bone mineral density of lumbar spine (L1.-5) was measured by Dual X-ray absorptiometry (DXA). Evaluation of lumbar BMD was performed before and after the end of six weeks of treatment. Results: Comparing mean value of bone mineral density showed that high intensity laser group (Group I) was statistically higher significant (P > 0.05) compared with the low level laser group (II) at the end of the treatment course. Conclusion: Laser is an effective method can be used for management of osteoporosis to improve bone mineral density in postmenopausal women, with recommendation from this study to use HILT than LLLT. Key words: High Intensity Laser Therapy, Low Level Laser Therapy, Bone mineral density, Postmenopausal osteoporosis.
