The Results of Slip Measurements in Above-knee Suction Sockets

Slip is defined, in this study, as relative motion between the stump skin and the socket. An excessive amount of slip may lead to abrasive injury, inadequate control over socket position and, ultimately, possible loss of the prosthesis. Conversely, lack of slip may conceivably reflect excessive restraint obtained by too tight a fit; implicit are large stump socket pressures. This study was conducted to measure the extent of slip at various locations within above-knee suction sockets. The range of total slip values encountered in four subjects is given as a function of location within the socket, under conditions of level walking.