Fig. 3From: Shoe-stiffening inserts for first metatarsophalangeal joint osteoarthritis (the SIMPLE trial): study protocol for a randomised controlled trialMechanical testing of the inserts. The measurement of the bending stiffness of the inserts placed inside an Oxford shoe (upper panel) and the results of the stiffness of the shoe with and without a sham and full-length shoe-stiffening insert (lower panel). The stiffness of each condition is reflected in the gradient of the plotsBack to article page