Limb Health and Socket Pressure in Response to Powered Ankle Protheses

Inclusion Criteria: * Ages 18 and above * Weight ≤ 280 lb * Ambulate at a K3 level or higher-level determined from patient EHR * At least 3 months post-amputation per physician discretion * Residual limb length greater than 4.5 inches * Use of a passive prosthesis * Unilateral transtibial amputees * Must be able to ambulate without any assistive devices * Subjects must be able to follow directions and give informed consent on their own Exclusion Criteria: * Conditions and/or co-morbidities that would prevent wearing a prosthetic socket, affect gait, or influence function of the contralateral limb * Other amputees * Cognitive deficits or mental health problems that would limit ability to consent and participate fully in the study protocol * Women who are pregnant or who plan to become pregnant in the near future * Individuals diagnosed with renal failure * Participants unwilling to wear a cloth face covering for the duration of each visit