The participants bend his knees in a prone position. The physical therapist holds the medial malleolus with one hand and the lateral malleolus with the other. At the same time, the physical therapist touches the participant's soles to the sternum area and presses them in the dorsal direction. At this time, medial malleolus glides anterior and lateral malleolus glides posterior. The first procedure is to passively recognize movement. The second procedure is accompanied by active movement of the participant.

Consists of 9 questions, 3 to 0 points for 5 questions, 4 to 0 points for 2 questions, 5 to 0 points for 1 question, and 2 to 0 points for another question. A total score of 30 points is the highest, 28 points or more are stable ankle joints, and 24 points or less are unstable ankle joints. The higher the score, the closer to normal, and the lower the score, the lower the stability.

Measured based on the accelerometer sensor built into the mobile phone with a clinometer app. After fixing the mobile phone on the participant's sole, press "0 clear" to calibrate it to the initial value. The physical therapist asks the participant to "flex the foot in the dorsal direction " Measure a total of 2 times and record it as an average value.