Biomimetic Transfemoral Knee with a Gear Mesh Locking Mechanism

Document Type


Publication Date

Winter 2016


The innovation presented in this paper is a passive knee locking mechanism that incorporates a cross-linked, four-bar mechanism similar to the sagittal plane configuration of the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL). The flexible four-bar mechanism guides the motion of the knee and aids in the return of the knee from full flexion to extension. The flexible four-bar mechanism also connects the femoral spur gear to the tibia spur gear. The gears are based on a circular radius, derived from femoral condyle dimensions. The gears are connected using a parallel link to keep the femur and tibia from moving away from each other when the knee is in motion. This prosthetic knee design is based on the anatomical dimensions of a human knee, which allows the design to be scaled from a large adult male to a small pediatric knee.

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Citation / Publisher Attribution

International Journal of Engineering Research and Innovation, v. 8, no. 2, p. 30-38