Reliability and Validity of Continuous Inter-limb Stability

Inclusion Criteria: * any individual with unilateral transtibial limb loss * a well-fitting prosthesis (as determined by a board-certified prosthetist through standardized prosthetic guidelines) for a minimum of one month * able to achieve a "Level 6 - Modified Independence" score on the Functional Independence Measure (FIM) for 2 mobility items (locomotion and transfers) Exclusion Criteria: * Individuals with active wounds/ulcers or significant musculoskeletal comorbidities on their intact limb that would impair ability to participate in biomechanical evaluations * any comorbidity that results in rapid limb volume changes (i.e., end stage renal disease with dialysis) * a poorly fitting socket * cognitive deficit(s) or mental pathology (e.g., dementia, amnesia) that would prevent the participant from understanding and following directions and limit the participant's ability to participate fully in the study * women who are pregnant or who plan to become pregnant during their participation in study activities * FIM scores less than Level 6 for locomotion and transfers