Crutches provide weight-bearing support for leg injuries, fractures, or surgeries, available in underarm (axillary), forearm (Lofstrand/elbow), and platform/gutter types. Underarm crutches feature padded tops under armpits with handgrips, ideal for short-term recovery (1-3 months) but risk nerve damage if misused; adjust to 2-finger width below armpit. Forearm crutches use cuffs around upper arms for long-term mobility, requiring strong upper body better balance and navigation. Platform crutches offer forearm platforms for arthritis or weak grips, reducing wrist strain via elbow support. Key features include adjustable heights, ergonomic grips, rubber tips, and 250-300 lb capacities. Proper use: weight on hands (elbows slightly bent), advance injured leg with crutches.