Clinical Outcomes With Non-Powered vs. Powered Prosthetic Knees by K2-level Amputees

Inclusion Criteria: * Are at least 18 years old * Transfemoral prosthesis user (limb absence between the knee and hip) * Current user of a mechanical knee * Regularly wears prosthesis at least 5 days per week * Have adequate clearance between distal end and ground for necessary knee and foot components * Current Medicare Functional Classification Level (K-Level) of 2 as determined by the healthcare team * Socket-Comfort Score: 6 or above to ensure adequate socket fit * Six months or more experience on a prosthesis * Body weight between 50kg and 116kg (110lbs - 256lbs) * Height between 1.2m and 1.95m (47.2in and 76.8in) * Has a phone to answer periodic study calls Exclusion Criteria: * Present injuries to residual limb or contralateral leg affecting functional ability * Contralateral amputation proximal to MTP (metatarsophalangeal) joint * Socket issues/changes in the last 6 weeks * Users with bone-anchored implants * Health or medical condition, diagnosis, or other cause that would prevent participant from effectively following study protocol, performing required outcome measures, and/or completing the study Subjects can be excluded at the discretion of the investigator for other unforeseen disqualifying criteria (such as specific cognitive issues, etc.). If subjects experience a health or medical condition that leaves them immobile for more than 2 weeks, they may be given the option to restart the study condition upon recovery, as long as eligibility criteria is still m…