Gait Knee¶

stance phase 60%
flexion-extension-flexion

swing phase 40%
extension

initial contact
extension (-2-5°flexion)

by keeping knee extended we keep stability

loading response
flexion (15°)
shock absorption

mid stance
5°increased flexion, then extends to 12°flexion
to keep stability

terminal stance
completion of extension, then flexion starts again at the end.

pre swing
flexion(up to 40°)
to prepare for the swing

swing
extension

people with prostetics have more knee flexion

implementation
simple hince joint.

rotation in knee
there has to be some rotation in the knee, otherwise it would be torque in the joint.
easiest to have the rotation below the knee