Design and Evaluation of a Prosthetic Knee Joint Using the Geared Five-Bar Mechanism


This paper presents the mechanical design, dynamics analysis and ankle trajectory analysis of a prosthetic knee joint using the geared 5-bar mechanism. Compared with traditional four-bar or six-bar mechanisms, the geared 5-bar mechanism is better at performing numerous movements and is easy to regulate. This prosthetic knee joint with the geared 5-bar mechanism is capable of fine-tuning its relative instantaneous center of rotation and ankle trajectory. The centrode of this prosthetic knee joint, that is mechanically optimized in keeping with the centrode of human knee joint, is better within the bionic performance than that of a prosthetic knee joint using the four-bar mechanism. Additionally, the soundness management of this prosthetic knee joint throughout the swing and stance part is achieved by a motor. By adjusting the gear ratio of this prosthetic knee joint, the ankle trajectories of each unilateral and bilateral amputees show less deviations from expected than that of the four-bar knee joint.

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