Waterproof and highly functional, the All-Terrain Knee Premium is a 4-bar prosthetic knee joint that fulfills the security needs of low mobility users while still meeting the physical demands of active amputees. LegWorks’ patented Autolock Technology stance phase controller instills confidence on all terrains, while the patent-pending swing phase controller allows for variable cadence without the use of hydraulics or pneumatics. An ideal knee for users who desire a water leg, the All-Terrain Knee Premium includes a simple twist-knob manual lock which allows for absolute stability in or around the water.