The Actua Knee Hydraulic is a polycentric hydraulic knee joint with stance flexion feature and interchangeable spring extension assist. The stance flexion can be tuned infinitely, which ensures optimal comfort during loading response. The patented horizontal hydraulic cylinder contributes to the compact size of this hydraulic knee joint. In addition, maintenance is easy with the innovative oil-refill system.
An artificial substitute for a transfemoral (above-the-knee) and/or knee disarticulation amputation designed as a component of an external lower-limb prosthesis to restore some of the appearance and/or function of the normal anatomy. It typically consists of metal and plastic and is constructed as a multiple-axis joint rotation, mechanical hinge that incorporates friction adjustment and a simple swing control that permits variable walking speed. A common design, known as a ?fourbar? knee, is very stable during early stance phase (beginning of a step), reduces the leg?s length when beginning a step lowering the risk of stumbling, and bends in the swing phase or when the user sits down.