Numerous clinical studies show that the medical laser for the treatment of osteoarthritis Nd: YAG Arthro has a biostimulating effect on the damaged cells of biological tissues in osteoarthritis. The biostimulating effect of the Arthro LASEST Nd: YAG laser for the treatment of osteoarthritis has a high degree of specificity and depends on various radiation parameters (mJ, sec, Hz), which are carefully selected in the LASEST medical protocols and are confirmed by a number of positive tests in medical centers. To stimulate the process of cell proliferation, the qualitative characteristics of Nd: YAG Arthro radiation (frequency and time of exposure) are more important than the total amount of energy; in addition, laser radiation in the treatment of ostearthrosis reactivates the pharmacologically blocked tyrosine kinase pathway. Therefore, in tissues with a blocked metabolic pathway that have undergone degeneration, radiation restores the anabolic phase of metabolism and homeostasis.