The purpose of the study is to investigate the clinical and functional outcomes of a powered knee prosthesis for people with a transfemoral amputation in the domain of gait, free space control, and embodiment

Inclusion Criteria:

• Male or Female age 22-65.
• The patient must have a unilateral transfemoral amputation .
• The patient must have the ability to ambulate at variable cadence (an expected lower extremity prosthesis functional level of K3 or above).
• The patient must have adequate socket to support the device.

Exclusion Criteria:

• Women who are pregnant.
• Severe co morbidity, atypical skeletal anatomy, or poor general physical/mental health that, in the opinion of the Investigator, will not allow the subject to be a good study candidate (i.e. other disease processes, mental capacity, substance abuse, shortened life expectancy, vulnerable patient population, BMI >40, etc.).

Subject confidentiality.