Fig. 2 a) Load vectors from vertical ground reaction force (GRFvt PC2, GRFvt PC3), medial-lateral ground reaction force (GRFml PC1), medial-lateral center of pressure displacement (COPx PC1 and COPx PC2); the grey area highlights the 0.71 treshold of meaning proposed by Fig. 2; b) Prosthetic usuer before and after intervention for GRFml; c) Prosthetic user before and after intervention for COPx.