Abstract
A crutch is usually used for rehabilitation after getting injured by an accident. There are some who use crutches in a not good position of the body; it is very dangerous. That is why, the authors develop a system which can advise inexperienced users of crutches and warns them for their inadequate walking styles. As a gyro sensor and a pressure sensor are provided with the crutch, the motion of the crutch can be measured. In addition, the threshold values of angle and angular velocity are defined. So, if the walking condition with a crutch is over them, the walker can notice the inadequateness of the walking style.
