To use crutches, adjust them so they reach about 1.5-2 inches below your armpits, with the handgrips even with the tip of your hip line. Hold the crutches tightly to your side, then lean forward and place both crutches about a foot in front of your body. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.