Comparisons of cartilage T2* values among three groups over 18 weeks using multiple linear regression with generalized estimating equations.

aGroup 1 = Control group; Group 2 = ACLX group; Group 3 = Sham group.*The interaction between two variables in the models.B: regression coefficient.组别1为对照组；组别2为ACLX组；组别3为假手术组。*模型中两个变量的交互作用。B：回归系数。