الفهرس 
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Abstract
Background: Osteoarthritis (OA) is a common musculoskeletal disease
of elderly and one of the leading causes of disability. Objectives: To
investigate the effect of High intensity laser Therapy (HILT) on myofascial trigger points (MTrPs) in symptomatic knee OA. Methods: 40 subjects diagnosed as knee OA with myofascial trigger points (MTrPs). Subjects were randomly allocated into two groups; the laser group (A) (n=20) which received high intensity laser therapy(HILT) plus knee osteoarthritis traditional exercises program in form of stretching exercises for both vastus medialis and gastrocnemius muscles , range of motion (ROM) exercises for knee flexion and extension , and isometric strengthening exercise of previously mentioned muscles, and the Sham group (B) (n= 20) which received sham HILT plus knee osteoarthritis traditional exercises program as laser group. Treatment for both groups was under the supervision of physiotherapist for 3 days per week during a period of 4 weeks at El Hadaya hospital . Blood cortisol level test ,pressure algometer, digital electronic goniometer and KOOS-PS questionnaire were used to measure pain level, pain threshold ,knee range of motion (ROM) and knee function respectively for both groups. Assessment was done on before treatment and after 4 weeks when treatment completed. Results: MANOVA test revealed that both groups showed significant improvement at week 4 in all measured variables with greater improvement in HILT group compared to sham group regarding to blood cortisol level, pressure algometer measures, knee passive ROM, and KOOS scores as (P < .05).Conclusion: HILT is an effective therapeutic method in the treatment of myofacial trigger points on knee osteoarthritis.