Fig. 3

Left: The illustration of the advancement of the V–Y flap (purple line; the distance of advancement does not exceed the height of the flap). Right: width of the digital base (W; yellow line) was defined as the distance from the radial to the ulnar sides of the digit over the palmar digital crease; the length of the proximal phalanx (P; red line) was defined as the distance between the PIP and palmar digital creases; and half the length of the middle phalanx (M; blue line) was defined as half the distance between the DIP and PIP creases