Pain-related risk factors after arthroscopic minimally invasive treatment of meniscus injury of knee joints were explored. Altogether 42 patients (conservative group), 40 patients (open group) and 46 patients (minimally invasive group) who received conservative treatment or arthroscopic knee surgery at the Quwo County People's Hospital were selected. The clinical effects of patients in the three groups at 24 weeks after treatment were observed. The knee joint activity, the knee injury and osteoarthritis outcome score (KOOS), Lysholm knee joint function score, VAS pain score and WOMAC score were recorded before treatment, at 24 weeks after treatment and at 2 years after treatment. Complications were also recorded. The related risk factors of postoperative pain were analyzed. There was no significant difference between the short-term efficacy of conservative treatment and that of surgical treatment (P>0.05); however, the long-term improvement effect of the surgical treatment on knee joint function and pain was better (P<0.05). The short-term and long-term effects of arthroscopic surgery were close to those of the open surgery. Arthroscopic surgery had a good long-term improvement effect on knee joint function and pain (P<0.05), and the incidence of postoperative pain was low (P<0.05). The results of logistic multivariate regression analysis manifested that WOMAC score, articular cartilage injury, time of postoperative weight bearing <1 week, no postoperative cold compress and open knee surgery were independent risk factors that affected postoperative pain (P<0.05). In conclusion, arthroscopic minimally invasive treatment has a good effect on patients with meniscus injury of knee joints who fail conservative treatment. Articular cartilage injury, postoperative weight bearing, cold compress and type of operation are independent risk factors that affect postoperative pain. Clinicians should bring patient attention to the prevention of meniscus injury and further improve the efficacy of treatment.

Background: High-position single-intercostal two-port video-assisted thoracic surgery (VATS) technique has been used for thoracic diseases. It can effectively avoid postoperative chronic pain compared with the traditional three-port VATS. This study aimed to evaluate the safety and efficacy of high-position singleintercostal two-port video-assisted thoracoscopic lobectomy. Methods: From June 2014 to December 2018, a total of 474 patients in our hospital with non-small cell lung cancer (NSCLC) underwent lobectomy with a high-position single-intercostal two-port video-assisted thoracoscope. A retrospective study of these patients was conducted, and follow-up was performed to analyze the patients' 3-and 5-year survival rates. Results: Of the total number of patients, 27.6%, 41.4%, and 31% underwent surgery between the third, fourth, and fifth intercostals, respectively. During the operation, 31 patients were converted to open surgery or three-port thoracoscopic surgery. The average surgical time was 160.9±44.9 min, the average postoperative hospital stay was 5.6±3.4 days, the incidence of postoperative complications was 7.2%, and the average number of lymph nodes resected was 13.6±5.3. The 3-year overall survival (OS) rate of IA1,