Underarm crutches, also known as Axillary Crutches, are by far the most commonly used type. The majority of temporary crutch users should use this style crutch. They require a minimum of training and substantially less upper extremity strength than other types of crutches and are generally less expensive. Crutches are most likely to be the appropriate walking aid when a person must not bear any weight on one leg, as would be the case with a broken leg, ankle or foot.