Final answer:
The hands are the main support when using crutches, with the elbows bent to facilitate this process. Proper posture and crutch adjustment are key to effectively distributing the body's weight.
Step-by-step explanation:
When a person is using crutches, the body part that is mainly used to support the body weight is the hands. While the armpits may come into contact with the top of the crutches, the majority of the weight should be supported by the hands to avoid nerve damage and discomfort in the underarm area. The hands grip the handgrips of the crutches doing most of the work while walking, with the elbows slightly bent to facilitate this support. The feet may also be used for balance and slight support, especially when one leg is non-weight bearing.
However, it's important to properly adjust the crutches to fit one's height to ensure the weight is distributed appropriately and to maintain proper posture. Using the hands for support aligns with their function to allow for movements of the wrist and hand, while also considering that the crutches also help in protecting nerves and blood vessels around the elbow by preventing too much pressure at that point.