Every engineering student at Purdue spends part or all of their final year working on a real-world project to fulfill their Senior Design requirement. At the end of the semester, each engineering department holds a competition to determine which idea is the ‘best in show.’ In 2009, the winner of Mechanical Engineering Senior Design’s highest honor, the Thomas J. and Sandra H. Malott Innovation Award, was a group called ‘Leg Up Design.’
Consisting of five students, the group designed and built a customized prosthetic leg for a Martinsville boy born with Proximal Femoral Focal Deficiency (PFFD) with the help of Kevin Hagemeier from Action Brace and Prosthetic. The novelty of this project comes from the fact that PFFD leaves a sufferer with one leg which is far shorter than the other, making normal walking impossible. The boy benefiting from this project had undergone standard procedures up until 2009, including having the foot on the deficient leg removed and being fitted with an elongated lower leg prosthetic, allowing him to stand normally and to walk, albeit with an odd gait due to uneven knee heights. While this solution did allow him to function far better than any previous alternative, it leaves much to be desired because it does not allow for fully normal movement.
Leg Up’s team used a four-bar linkage to translate the motion of the deficient knee to a prosthetic knee at the anatomically appropriate location, allowing a normal gait, improving his speed and agility in the sports he plays, and making it possible for him to ride a bicycle for the first time. The team chronicled its progress with the project at https://globalhub.org/groups/2009mesd/overview.


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