Abstract: This study investigated the application of CT and magnetic resonance imaging (MRI) in the classification and diagnosis of ankle sports fractures. A total of 184 patients (184 ankles) with ankle joint injury were selected for clinical research. All patients received CT and MRI examinations before the operation. The relationship between MRI ankle fracture classification and fracture grade was analyzed. According to the patient's ankle function recovery 6 months after operation, the patients were divided into an excellent group of 118 cases and a general group of 66 cases, and the differences in CT, characteristics and MRI characteristics of the two groups of patients after operation were compared. The results showed that,the main fracture classification of patients with fracture grade Ⅰ was supination and adduction type. The main fracture classification of patients with fracture grade Ⅱ was supination and external rotation type. The main fracture types of patients with grade Ⅲ were supination and external rotation type, pronation and abduction type. The main fracture type of patients with fracture grade Ⅳ was pronation and dorsiflextion type. The correct rates of CT and MRI in diagnosing different types of ankle fracture were all over 85%, and there was no significant difference in the correct rates of the two methods (P>0.05). 6 months after operation, the proportion of patients with anterior and posterior displacement of the lateral malleolus <2.0 mm, overlapping anterior and posterior displacement of the medial malleolus <2.0 mm, and posterior malleolus displacement value <2.0 mm in the excellent group was higher than that in the general group (P<0.05). Both CT and MRI have high practical value in the preoperative classification and diagnosis of ankle fractures, and postoperative joint function rehabilitation effects can be evaluated based on imaging parameters.

Key words: CT, magnetic resonance imaging, ankle fracture, diagnosis, ligament injury