A system and method associated with the movement of a limb. In one example,the system, such as a prosthetic or orthotic system, includes an actuator(116) that actively controls, or adjusts, the angle between a foot unit (104)and a lower limb member (102). A processing module may control movement of theactuator (116) based on data obtained from a sensor module. For instance,sensing module data may include information relating to the gait of a user andmay be used to adjust the foot unit to substantially mimic the movement of anatural, healthy ankle. The system may further accommodate, for example, levelground walking, traveling up/down stairs, traveling up/down sloped surfaces,and various other user movements. In addition, the processing module mayreceive user input or display output signals through an external interface.For example, the processing module may receive a heel height input from theuser.
