This suspension is similar in its function to the Silesian suspension, and can be more comfortable. The wide elastic belt wraps around the pelvis and closes with Velcro. Suction People with transfemoral amputations perceive suction suspension to be subjectively lighter and easier to control than any other. Because suction can undermine the skin, it is appropriate only for those whose residual limbs are relatively long and unscarred. These limbs have large and regular surface areas over which suction forces can be distributed.
Suction also requires a residual limb whose volume is stable.
People whose limb volume changes due to problems like chronic renal disease or rapid weight change cannot use suction suspension. To do this, one must have good balance on the sound leg while flexing the trunk and hips, and possess good function and strength in both upper extremities. Thus, suction is inappropriate for people with poor UE function, or whose cardiac status might contraindicate strenuous UE activity while leaning over. To don the prosthesis, the wearer routes the pull sock through a valve hole located on the antero-medial wall of the socket's distal end. After pulling the soft tissue into the socket, the amputee maintains weight on the RL and replaces the valve.