Knee joint angle measurement using accelerometry based system

Today human gait analysis systems are mainly laboratory optics based systems. Sometimes these devices could restric patients’ natural movements because of their construction and/or weight. Therefore [1, 2, 5] measurement results may be completed by some errors. Secondly, there are no fully-compact systems commercially available , which could provide mesurement of selected gait parameters heving abilities to be easily connected as feedback to todays systems. In this paper authors present competitive measurement methods which allow data collection of selected kinematics parameters of human gait. To do this authors used low-cost, widely available MEMS 3-axis acceleration sensors. Presented methods of knee joint angle measurement was based on gravitation acceleration sensitivity of the accelerometer. A set of 3 electronic devices based on 3-axis MEMS accelerometers has been used [2] . Collected data from those accelerometers were furher used for calculations of each sensor orientation.