Location
Tareq, Amman, Jordan
It monocentric type of knee works as a simple hinge with one part of the knee rotating about the other using a shared pivot point.
Polycentric knees are more complex than the monocentric design, having more than one pivot points. These extra axes of rotation allow the knee to bend with a more anatomically correct gliding motion.
3R20 modular-knee-joint-polycentric
Pneumatic (air) controlled knees have inner chambers which house a sliding piston. The piston seals against the side of the chamber much like a bicycle pump. As the piston moves, air is compressed by it, regulating the pressure against the bending and straightening moments of the knee. The pressure These systems allow a different stiffness during different phases of gait. The result allows the user to walk more comfortably at different speeds.
3R78_Polycentric with pneumatic swing phase
Hydraulic (fluid) controlled knees have fluid filled inner chambers which house a sliding piston. The piston seals against the side of the chamber much like a bicycle pump. As the piston moves, liquid (usually silicone oil) is transferred from one chamber to another. The flow of fluid is regulated by control valves which can be adjusted to moderate the bending and straightening resistance of the knee. The movement of fluid allows the user to walk more comfortably at different speeds.
3r60-hydraulic
