[Purpose] To explore the factors associated with medial meniscal subluxation in knees with medial meniscus tears. [Methods] The patients who have been treated with knee arthroscopic surgery for medial meniscus tears between January 2014 and March 2020 were enrolled in this study. The subluxation group included patients with medial meniscal extrusion distance≥3mm. Other patients were included as the control group. Demographic and clinical data were collected. A univariate analysis and a multivariate logistic regression analysis were performed to identify factors associated with medial meniscal subluxation. [Results] This study involved 110 patients, including 54 in the subluxation group and 56 in the control group. In a univariate analysis, the Outerbridge classification (P=0.003 ), the extent of joint effusion（P=0.013）and the type of medial meniscus tears (P=0.000) were significantly different between the two groups. According to the multivariate logistic regression analysis, the type of medial meniscus tears (P=0.000) was an independent factor associated with medial meniscal subluxation. Compared with horizontal tears, radial tears and complex tears had approximately 9-fold (OR=9.444；P=0.000) and 4-fold (OR=4.486；P=0.003) higher associations with medial meniscal subluxation, respectively. [Conclusion] The type of medial meniscus tears was an independent factor associated with medial meniscal subluxation. Radial tears and complex tears were more likely than horizontal tears to result in medial meniscal subluxation.