An Investigation on Function and Performance of a New Microprocessor Controlled Prosthetic Knee

Inclusion Criteria: * 45Kg\< body weight \< 136Kg * Cognitive ability to understand all instructions and questionnaires in the study; * Unilateral TF/KD amputees that are regular prosthesis users for at least 3 months * Current MPK users (passive MPKs only) * Age ≥ 18 years * Willing and able to participate in the study and follow the protocol * Moderate to high active users (PLUS M T-score\>4021) Exclusion Criteria: * Users with stump pain * Users with socket problems * Pregnant Users * Users using Power Knee, Kenevo or mechanical knees as their prescribed prosthesis * Alignment that cannot be matched with the Rheo Knee 4 setup, as described in Instructions for use. * Osseointegration