Criteria for Advanced Prosthetic Foot Prescription

Inclusion Criteria: * DEERS eligible Veteran or Service Member, or civilian with unilateral transtibial amputation * Currently using an Energy Storing and Returning prosthetic foot with a well-fitting socket as a primary or back-up prosthesis * Achieved a "Modified Independence" score on the Functional Independence Measure (FIM) for the locomotion mobility items * Has a minimum clearance of 8 ¾ inches to accommodate all feet Exclusion Criteria: * Has active wounds/ulcers or significant musculoskeletal comorbidities on their intact limb that would impair their ability to participate in all functional outcome measures * Has any comorbidity that results in rapid limb volume changes (i.e. end stage renal disease with dialysis), * Weighs more than 275 pounds, the maximum product weight load * Is unable or unwilling to comply with all research visits * Has cognitive deficit(s) or mental health pathology limiting a subject's ability to participate fully in the study * Women who are pregnant or plan to become pregnant during study activities. This will be determined by asking the participant if they are pregnant or if they believe that they may be pregnant. This question will only be asked at inclusion, as biomechanical changes will only be impacted if the woman is in the 2nd or 3rd trimester, and will not be impacted if the participant becomes pregnant while in the study. * Poorly fitting socket * Vision loss that requires use of an assistive device for gait * Upper Limb Amputati…