Fig. 5

Recruitment curves for the fibular and tibial nerve cuff electrodes in Subjects 09 and 10. Caption: Pulse width-modulated recruitment curves normalized to body weight for two subjects with monopolar spiral nerve cuff electrodes on their tibial and fibular nerves. Negative moment values represent plantarflexion; positive moment values are dorsiflexion. 0.01 Nm/kg is normally required to prevent foot drop [42] and is represented by a horizontal gray line. Plantarflexion moment during push-off at a normal walking speed is 1.6 Nm/kg [43], which was too large to be shown. When the data were collected, Subjects 09 and 10 had been implanted for 4.5 years