Effectiveness of Frontal Plane Adaptability in a Novel Foot Prosthesis

Inclusion Criteria: * Participants will be 16-years or older, regardless of gender, race, or ethnicity. * Potential participants should reside in the community or an independent living environment. * The upper weight limit is 165.6 kg (365 lbs.). * Prosthetic foot sizes 22 cm (approximate US Men's shoe size 5) up to 30 cm (13 US Men's). * Ability to walk more than 400 m on level ground without an increase in pain. * At least one year post-amputation and using a prosthesis * People must have the ability to read, write, and comprehend English. Exclusion Criteria: * Participants must not have conditions such as skin wounds that preclude the use of a prosthesis. * People will be excluded if they have fluctuating conditions that may significantly alter gait mechanics during the \~10-week study. Examples include Parkinson's disease, alcoholism, brain tumor, and hereditary cerebellar ataxias. * Participants may use a walking aid but should not primarily rely on wheelchair mobility. * People will be discontinued from the study if they become unable to use a prosthesis. Examples include major surgery and trauma. However, because of the potential for fluctuations in prosthesis use with this population, short-term issues will not disqualify people from continued participation when they resume prosthetic use.