Objective:To investigate the clinical effect of ozone combined with sodium hyaluronate injection in the treatment of knee osteoarthritis and its effect on inflammatory factors and hemorheology in patients.Methods:146 patients with knee osteoarthritis who received treatment in our hospital from October 2016 to February 2019 were selected and divided into observation group and control group according to the random number table method, 73 cases in each group.In the experimental group, intra-articular injection of sodium hyaluronate combined with ozone was used, while in the control group, glucosamine hydrochloride tablets were routinely taken and intra-articular injection of sodium hyaluronate was performed. Patients in both groups were treated once a week for 5 consecutive weeks for a course of treatment. General data of patients in the two groups were analyzed, and the efficacy, visual analogue scale (VAS) score and hospital for special surgery knee score (HSS) before and after treatment, levels of inflammatory factors and changes in hemorheology indexes were compared between the two groups.Results:There was no significant difference in general data between the two groups ( P>0.05). Before treatment, there was no significant difference in VAS score and HSS score between the two groups ( P>0.05). After treatment, VAS score and HSS score in the two groups were significantly decreased and increased respectively ( P<0.05). Compared with the control group, VAS score was significantly decreased and HSS score was significantly increased in the observation group after treatment ( P<0.05). The total effective rate in the observation group was higher than that in the control group, and the difference between the two groups was statistically significant ( P<0.05). Before treatment, there was no significant difference in the levels of inflammatory factors vascular endothelial growth factor (VEGF), tumor necrosis factor (TNF-α), interleukin (IL)-1β, IL-6, hypersensitive C-reactive protein (hs-CRP) and matrix metalloproteinase (MMP)-13 in the articular fluid between the two groups ( P>0.05). After treatment, the above indexs in the observation group were significantly lower than those in the control group ( P<0.05). After treatment, the levels of inflammatory cytokines in the articular fluid of the two groups were lower than before ( P<0.05). There was no significant difference in hemorheology indexes between the two groups before treatment ( P>0.05), and the two groups were significantly improved after treatment, and the degree of improvement in the observation group was significantly better than that in the control group ( P<0.05). Conclusions:Ozone combined with sodium hyaluronate intra-articular injection is more effective in the treatment of knee osteoarthritis, which can effectively reduce the level of inflammatory factors and inflammatory response, improve hemorheology, and then reduce the pain of patients, improve the knee joint function.