Abstract:[Objective] To introduce the surgical technique and preliminary clinical outcomes of a modified arthroscopic technique for lateral meniscus cyst of the knee. [Methods] A retrospective study was conducted on 120 patients who underwent arthroscopic surgery for lateral meniscus cyst from January 2017 to December 2018. All the patients received a modified arthroscopic therapy, involving resection of the lower part of the teared meniscus, drainage of cyst fluid, and complete resection of synovial cyst wall, meniscus repaired if necessary. Lysholm and Tegner scores were used for evaluation of clinical outcomes, while MRI at 3 days after surgery and the latest follow-up was taken to evaluate the resection and recurrence of cysts. [Results] All the 120 patients underwent the arthroscopic procedures smoothly with- out serious complications, such as injuries to blood vessels and nerves. The Lysholm score [ (56.21±7.51) versus (88.82±3.46) ] and Tegner score [ (3.74 ±0.64) versus (5.92±0.72) ] significantly improved at the latest follow-up compared with those preoperatively (P＜0.05) . Radio- graphically, the MRI 3 days postoperatively showed that cyst had been completely resected in 115 cases (95.8%) except partial remnants in other 5 cases, while the MRI at the latest follow-up revealed that no cyst recurred in all patients including the 5 cases who had cyst existed partially. [Conclusion] This modified arthroscopic technique does maximize resection of cyst and cyst wall tissue, with advantages of good recovery of postoperative knee joint function, and lower postoperative recurrence rate for lateral meniscus cyst of the knee.