Fig. 2

Schematic illustration of the Application score. 1. Pulling the valve of the vacuum cushion to allow air to enter; 2. Fluffing the vacuum cushion; 3. Placement of the foot in the vacuum cushion and adjustment of the vacuum cushion in the lower shell; 4. Pushing the heel into the vacuum cushion; 5. Placement of the upper shell over the front of the vacuum cushion; 6. Locking the straps in correct sequence (starting with the inner straps 1 and 2 and completing with the outer straps 3 and 4); 7. Making the vacuum cushion rigid using the bulb pump; 8. Fastening all four straps. The number of points assigned to each task is depicted in the lower row