The Polycentric, pneumatic 4-bar knee from Trulife has adjustable flexion and extension controls. It is available with built-in proximal pyramid or attached disarticulation bracket.
Above knee amputation, medium to high activity, K3-K4, maximum weight of 100 kg • 220 lb
Knee disarticulation, moderate activity, K3, maximum weight of 125 kg • 275 lb
For more detail: http://trulife.com/all-products/prosthetics/knees/PC-Pneumatic-Knee