In this study, the investigators will compare the safety and effectiveness of RoFT, a robotic ankle prosthesis developed by a Korea Institute of Machinery & Materials, Meridium of Ottobock Co., a representative commercial ankle-type robotic prosthesis, passive prosthetic limb that the patients have been using so far.~In order to compare the above three types of prostheses in terms of their effectiveness and safety, the robotic prosthesis will be evaluated after 30 minutes of familiarization after applying, and the evaluation interval using the two types of robotic prostheses will be 2 weeks to eliminate the carryover effect. For evaluation, 3D motion analysis, dynamic EMG analysis, energy consumption analysis, 6 minute walk test, Berg balance scale, Locomotor Capabilities Index, and Korean-Prosthesis Evaluation Questionnaire will be used.~For safety analysis, any kinds of safety issues including skin abrasion, bone fracture, or tendon/ligament injury due to fall down injury will be recorded and categorized for statistical analysis.
In this study, we aim to compare the three types of prosthetic limbs: the passive prosthetic limb that the patients have been using so far, the 'RoFT', a prosthetic limb developed by the Korea Institute of Machinery & Materials, and the Meridium of Ottobock in terms of safety and effectiveness.