Abstract: This article discussed the clinical value of high-frequency ultrasound in the diagnosis of ankle lateral collateral ligament injury and the rehabilitation training of sand bed. 120 patients with ankle lateral collateral ligament injury treated were selected as the research subjects. Among them, 78 patients were treated with conservative rehabilitation therapy combined with sand bed rehabilitation training (conservative group), and 42 patients were treated with surgery combined with sand bed rehabilitation training (operation group). There was no significant difference in the degree of injury of the anterior talofibular ligament diagnosed by high-frequency ultrasound compared with MRI in the conservative group (P>0.05). There were 34 cases patients with anterior calcaneofibular ligament injury in the conservative group, and there was no significant difference in diagnosis of anterior calcaneal and fibular ligament injury between high-frequency ultrasonography and MRI (P>0.05). There was no significant difference in the degree of injury of the anterior talofibular ligament and anterior calcaneofibular ligament in the high-frequency ultrasound diagnosis665of the operation group and intraoperative findings (P> 0.05); high-frequency ultrasound evaluation of the ankle joint function of the cured group was significantly better than that of the effective group (P<0.05). There is little difference between high-frequency ultrasound in diagnosing lateral ankle collateral ligament injury and MRI diagnosis and intraoperative findings. High-frequency ultrasound has certain clinical value as a preoperative diagnosis of ankle lateral collateral ligament injury and judgment of ankle function recovery.

Key words: high-frequency ultrasound, diagnosis, ankle joint, lateral collateral ligament injury, sand bed rehabilitation training