Despite advances in prosthetics, most still lack a high degree of flexibility, says Jennie Si, a Fulton Schools professor of electrical, computer and energy engineering. Si and Helen Huang, who earned a doctoral degree at ASU, are collaborating on development of lower-limb “active” prosthetics that adapt to individual users to provide a full range of motion. Si and Huang hope to improve on prototypes until users can feel as if they have natural limbs and fully functional knees.