Design and Fabrication of an Active Knee Orthosis for Rehabilitation of Lower Limbs

Background: the main objective of this study is to design and produce a twolinkactive knee orthosis with 2 degrees of freedom to rehabilitate patients’lower extremities in moving their feet. this study aimed to provide motorindependence in patients with cerebrospinal cord injury, quadriceps and kneejoint injuries in athletes, and deviation of the quadriceps angle in the elderly.methods: the current research is an experimental method. we have tried, whileeliminating a physiotherapist, to enable movement modification of organs thatsuffer from dynamics poverty and ensure an improved movement for injuredorgans. in order to reduce external fluctuations and turbulences and determineorthosis opening and closing angle, a dc motor with a helical gearbox anda pid controller was used. in addition, an arduino microcontroller and apotentiometer were used for processing and angle determination, respectively,to provide minimum wiring and maximum accuracy and performance for theproposed orthosis.results: in order to verify the mechanical parts of the proposed orthosis, threetests were performed with different angles without charging the orthosis.conclusion: results showed that the proposed orthosis admissibly trackedintended angles and had a proper weight and volume to provide safety andcomfort for the foot and knee joint.