Fig. 2

Push-off power of the prosthetic foot as a function of normalized stance time. The ESAR foot (red) generates negative power, storing elastic energy, in midstance and generates a higher positive push-off power, returning, more elastic energy during push-off compared to the SACH foot (green). The coloured surface below the power profile indicates the amount of work delivered during push-off (Figure amended from Wezenberg et al. 2014 [9])