Designing a 3D virtual test platform for evaluating prosthetic knee joint performance during the walking cycle

Abstract

Abstract This article introduced a three-dimension CAD model of a prosthesis testing platform using SolidWorks software to conduct a kinematic and dynamic analysis of the transfemoral prosthesis of the virtual model. Concurrently, the event-based motion simulation (EBMS) procedure was carried out on the CAD model. The concept of the operational strategy of the test platform was clarified through the machine’s real-life experience before being constructed in vitro. The platform model is capable of reproducing two active movements to simulate the locomotion of the thigh angle and hip vertical displacement for assessing the artificial knee angle motion during the gait cycle. These motions were controlled by two rotary forces (motors) that are utilized to implement control actions in EBMS. The prosthetic knee joint was built with a single axis that performs flexion and extension via the axial force of the spring. The simulation results of the thigh angle motion ranged from 2 0 ° 2{0}^{^\circ } to − 1 5 ° -1{5}^{^\circ } , while the maximum flexion of the prosthetic knee joint was ( 4 6 ° 4{6}^{^\circ } ). The mean absolute error was ( 2.72 7 ° 2.72{7}^{^\circ } ) and ( 8.33 8 ° 8.33{8}^{^\circ } ) for the thigh and knee joints, respectively. In conclusion, the findings can be utilized to facilitate the design and development of prostheses.