Objective To evaluate the clinical efficacy of total internal suture assisted by arthroscopic meniscus suture in meniscus tear at the lateral diaphragmatic tendon fissure.Methods 32 patients with meniscal tear at the patellar tendon from January 2018 to June 2019 under arthroscopic total suture were selected. The patients were aged 20 ~ 47 years, with an average of (33.75 ± 8.21) years old; 21 males and 11 females; 14 left knee injuries and 18 right knee injuries. Postoperative knee function was assessed by the Lysholm score, Tegner score, and American Knee Society Score (KSS) at preoperative and 6-month follow-up; The visual analogue scale (VAS) and the range of joint activity span before and 6 mouths after surgery were used to evaluate the pain and improved joint mobility.Results All patients were followed up for 6 months. The Lysholm score of the patients before surgery increased from (56.80 ± 10.34) to (89.56 ± 5.71), the Tegner score increased from (2.47 ± 0.78) to (5.63 ± 1.21), and the KSS increased from (42.28 ± 4.75) to (89.28 ± 3.95), the VAS decreased from (5.03 ± 1.77) to (1.85 ± 0.54), and the range of joint mobility increased from (51.34 ± 16.19)° to (126.38 ± 6.03)°, there were statistically significant (P < 0.05).Conclusion The meniscus at the iliac tendon fissure is relatively loose, the total internal suture assisted by stapler is used, in the process of suturing, the popliteal tendon and meniscus are sutured at the same time, which can greatly improve the postoperative clinical symptoms, improve stability and increase joint mobility, worthy of clinical promotion and application.