Transfemoral Powered Foot and Physical Therapy Study

Inclusion Criteria: * Unilateral TFA, any etiology * Experienced (\> 6 months) microprocessor knee user * Less than or equal to 8 amputation related physical therapy sessions in the previous 6 months * At least 18 y.o. * High K2 or above ambulator * Able to walk a minimum of 30 m without an assistive device * Able to walk on treadmill for 5 minutes at self-selected speed with or without use of handrails Exclusion Criteria: * Inability to tolerate wearing of a socket or a poorly fitting socket * Condition of intact limb prohibits prosthesis use (ulcers, sores, skin breakdown, burns, poor skin coverage, contractures, and severe heterotopic ossification) * The length of the residual limb prohibits socket/device fitting * Cognitive deficits or a mental health pathology limiting the ability to participate fully in the study or any deficit deemed by the PI to be detrimental to the completion of the study * Significant comorbidity, which would interfere with the study (for example: neuropathy, uncontrolled diabetes, receiving dialysis, have insensate feet or severe phantom pain or a history of skin ulcers) * Severe circulatory problems including peripheral vascular disease and pitting edema * Pregnant women in the 2nd trimester or beyond or women who will be in the 2nd trimester within the enrollment period. This will be determined by asking the participant if she is pregnant or if they believe they may be pregnant. The question will only be asked at inclusion, as biomechanical c…