A Crutch is a mobility aid used to counter a mobility impairment or an injury that limits walking ability. There are several types of crutches:
Forearm crutches are crutches with a cuff at the top to go around the forearm, Forearm crutches are used by slipping the arm into a cuff and holding the grip. The cuff, typically made of plastic or metal, can be a half-circle or a full circle with a V-type opening in the front allowing the forearm to slip out in case of a fall.
Underarm crutches are used most often by people with permanent disability or injury which make one leg completely incapable of giving any support to the upper part of the body . These are used by placing the pads against the ribcage beneath the armpits and holding the grip, which is below and parallel to the pad.