Objective To explore the effectiveness of motor imagery training(MIT)on knee function,kinesiophobia,and functional exercise compliance in patients after knee replacement.Methods From June 2022 to August 2023,convenience sampling was used to select patients who underwent knee replacement and were admitted to the Fourth Clinical College of Xinxiang Medical University as participants.The patients were divided into control group(n=98 cases)and observation group(n=98 cases)according to their enrollment time.The control group received routine postoperative rehabilitation,while the observation group was treated with MIT in addition to the control group.The knee function,kinesiophobia,and functional exercise compliance of two groups of patients were compared before and after intervention.Results After intervention,in observation group,the Western Ontario and McMaster Universities Osteoarthritis Index score was lower than that in control group,the score of Hospital for Special Surgery was higher than that in control group,the Tampa Scale of Kinesiophobia score was lower than that in control group,and the compliance with functional exercise was higher than that in control group,with statistical differences(P<0.05).Conclusions Applying MIT on the basis of rehabilitation training can alleviate the kinesiophobia in patients after knee replacement,improve their exercise compliance and knee function.