Abstract
Introduction and Aim: Knee Osteoarthritis (KOA) is a common degenerative joint disease which is one of the leading causes of disability in elderly people. Electromyography (EMG) is an electrophysiological method in evaluating skeletal muscle activity. Low-level laser (light) therapy (LLLT) is a modality of treatment used in several conditions required to suppress the pain, inflammation, stimulation of healing and restoration of function. Surface EMG parameters were studied before and after the low level laser therapy in subjects with knee osteoarthritis. 
 Materials and Methods: Subjects with knee OA participated in the study. Low level laser therapy (LLLT) was administered using a laser device with probe giving maximum power output of 10 mw with a wavelength of 810 nm. Surface electromyography (sEMG) of quadriceps muscles was recorded in all the study participants before and after the therapy. The parameters were statistically compared. 
 Results: There was a statistically significant difference between the maximum contraction and duration of contraction before and after the laser intervention in all the muscles. 
 Conclusion: It can be concluded that the muscle performance increased in the subjects with knee OA after the LLLT.
Highlights
IntroductionSurface EMG parameters were studied before and after the low level laser therapy in subjects with knee osteoarthritis
Introduction and AimKnee Osteoarthritis (KOA) is a common degenerative joint disease which is one of the leading causes of disability in elderly people
It can be concluded that the muscle performance increased in the subjects with knee OA after the level laser (light) therapy (LLLT)
Summary
Surface EMG parameters were studied before and after the low level laser therapy in subjects with knee osteoarthritis. Knee Osteoarthritis (KOA) is a common degenerative joint disease which is one of the leading causes of disability in elderly people. Incidence of KOA is more as the age increases. The risk factors for KOA are several which include higher age, obesity, repetitive joint trauma, squatting and kneeling. Subjects suffering from KOA have profound effect on physical and psychological quality of life. Their mobility is restricted affecting normal domestic activities and adversely impacting overall normal lifestyle [2]. The conventional radiographs are widely considered as gold standard for the assessment of knee OA [3, 4]
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