The degree of scar directional change and lengthening is affected by the angles of the flap. In the 30-degree Z-plasty, the direction of the change is approximately 45 degrees from the initial position of the central limb and there is a 25% gain in scar length. With a 45-degree Z-plasty, the resultant limb lies in a more oblique position, approximately 60 degrees from the initial position and there is a 50% gain in scar length. A 60-degree Z-plasty will yield a 75% increase in scar length and a 90-degree change in scar direction (the broken line represents the original scar).