(The light is powered by a 9-V battery mounted on the frame and is activated by a contact switch near the mechanical stop.) The user then eccentrically plantar flexes and lowers the load to the base.
Also, if the patient flexes the knee, plantar flexes the ankle against no resistance, and then extends the knee, the pedal can be pressed without active plantar flexion.
I have also found a correlation between low DKF and patellofemoral pain, presumably due to forced pronation, thus patellofemoral malalignment, as the advancing tibia in plie plantar flexes
the talus, pronating the foot.