Fig. 4.

Interface pressure vs. residuum tissue strain relationships at the posterior calf, distal tibia and patella tendon locations, showing combined results for all the three loading cases applied to a reference, unactuated socket model. HS—Heel Strike, FF—Foot Flat, MS—Mid Stance, HO—Heel Off, TO—Toe Off. The dashed lines indicate the region for safe interface pressure actuation control, up to the 57% tissue damage strain threshold [16], and the shaded area indicates the high damage risk region