To observe the efficacy of small needle knife combined with extracopreal shock wave therapy in the treatment of patellar tendinitis. Methods:To randomly select 60 patients with patellar tendinitis, including 19 female and 41 male. Then randomly divided them into treatment group and control group, with 30 cases in each. The control group was orally administrated Diclofenac Sodium Sustained Release Tablets. The treatment group was given small needle knife combined with shock wave therapy. The treatment duration is 4 weeks. Before and after treatment, musculoskeletal ultrasound examination was conducted, and clinical efficacy, pain visual analogue scale (visual simulation score, VAS), serum tumor necrosis factor alpha (TNF necrosis Factor-alpha TNF alpha in the) were recorded and analyzed. Results:After 4 weeks of treatment, the effective rate of the treatment group was 86.66% and that of the control group was 76.66% with significant difference(P<0.05). Musculoskeletal ultrasound showed inflammation of the treatment group was significantly reduced after treatment, and the content of TNF alpha, VAS score and serum significantly improved (P<0.05). Conclusion:Small needle knife combined with shock wave therapy is safe and effective in improving clinical symptoms of patients with patella tendinitis.