A gait monitoring and healthcare system includes a first IMU, a second IMU and a local host. The first IMU senses an activity state of a thigh and generates a first activity signal. The second IMU senses an activity state of a calf and generates a second activity signal. The local host includes an alarm and a microprocessor, which performs operations of: calculating a first pitch angle between a horizontal plane and the first IMU and a second pitch angle between the horizontal plane and the second IMU according to the first activity signal and the second activity signal; calculating activity information of a knee joint, including a bending angle, an angular velocity and a duration of the knee joint, according to the first pitch angle and the second pitch angle; and judging whether the bending angle of the knee joint falls within a dangerous range or not according to the activity information, and controlling the alarm to output a warning signal if not. |