The All-Terrain Knee is a 4-bar prosthetic knee joint that fulfills the security needs of low mobility users while still meeting the demands of active amputees. LegWorks’ patented Autolock Technology stance phase controller locks upon full swing phase extension, giving amputees confidence on all terrains. The patent-pending swing phase controller allows for variable cadence without the use of hydraulics or pneumatics, while a simple twist-knob manual lock offers users increased safety during the rehabilitation process or situational use on uneven terrain.