An extant tissue tester designed for rate-controlled indentation of the bulk soft tissues of lower extremity residual limbs was modified to include force feedback (proportional control) and enable creep testing. This device employs a digital linear actuator and a load cell that measures the reaction force resulting from tissue indentation. The current force value, f, is compared to the target force (ft) prescribed by the user. If the force falls outside of the region: 0.99 ftft) proportionally, based on the relative difference between f and ft
