a continuous and non-interrupted elongated stay member disposed posterior to the leg and having a lengthwise profile that closely approximates a posterior contour of the leg, the stay member having a femoral portion, a tibial portion, and a permanent non-articulating and linear popliteal region therebetween, wherein the stay defines a first curvature whereat the femoral portion merges with the popliteal region, and a second curvature whereat the popliteal region merges with the tibial portion;

a femoral cuff individually slidably disposed on the femoral portion;

a tibial cuff individually slidably disposed on the tibial portion;

at least one liner that at least partially envelopes the leg, disposed on at least one of the stay member, the femoral cuff, and the tibial cuff;

wherein the femoral and tibial cuffs are selectively adjustable relative to the stay member, the stay member defining a plurality of openings and a button being biased against at least one of the femoral and tibial cuffs and into one of the openings to permit the selective adjustment of the femoral and tibial cuffs along the stay member;

wherein the first and second curvatures are spaced by the popliteal region, the popliteal region oriented diagonally between parallel and spaced apart first and second reference lines approximating locations of the femoral and tibial portions, respectively, whereat the first and second curvatures lie, respectively, the femoral portion merges at the first curvature orienting the popliteal region toward the second curvature which in turn merges into the tibial portion.