Socket pistoning depends on socket design in a person with a transfemoral amputation walking at different speeds and slopes

Developing a method to quantify and improve the “fit” of a prosthetic socket would presumably enhance the function of a person with a transfemoral amputation (TFA). Previous studies have found a correlation between increased socket pistoning, the movement of a prosthetic socket relative to the residual limb, and reduced comfort. We quantified socket pistoning in a participant with a unilateral TFA while he walked at different speeds and slopes using two different sockets, a conventional suction socket and a novel Quorum lanyard socket. We found that socket pistoning varies based on the type of socket used and in general, increases when walking uphill or downhill compared to level ground and when walking faster.