To walk downstairs, you hold the handrail with one hand, and place both crutches in the other hand holding onto the hand grips. To support yourself, place both crutches one step below and check that they are placed steadily. If you are allowed to weight bear on your leg: Placing weight onto the handrail and crutches, you put your injured leg on the step below, and then step with your healthy leg.If you are non-weight-bearing, you distribute the weight between the handrail and the crutches and jump up to the next stair with your good leg.
In a case, if there is no handrail and you do not have anyone in the vicinity to support you, you need to hold one crutch under each arm, and put them below one step at a time. Then, you bring down your injured leg and, finally, take a step with your healthy leg. Another option is to sit on the stairs and scoot down using your good leg.