Once femoral head necrosis is diagnosed, crutches should be used correctly to effectively avoid weight-bearing or partial weight-bearing. For example, when going upstairs, you should first step on the healthy lower limb, then step on the affected limb, and finally go up again with the double crutches, and when going downstairs, you should first let the double crutches down, then the affected limb, and finally the healthy limb. When walking on a flat road, you can first move the left crutch forward, then step on the right lower limb, then move the right crutch forward, and finally step on the left lower limb, that is, the four-point gait method. If you need to use a single crutch, do not put the crutch under the armpit of the healthy side and walk with the affected limb at the same time, which can eliminate the fatigue of the affected hip muscle, reduce the force on the affected hip, and increase stability. If you need to use a cane you should pay attention to the height of the cane, not higher than the top of my left ridge. Choose the quality of the cane to wood (ash wood is better) and metal (aluminum) is most commonly used. To choose a cane of good quality without cracks, scars, etc., the handle should have sufficient sponge protection. The choice of height should be the length from the front edge of my armpit to the outer edge of the bottom of my foot plus 5 centimeters, or my height minus 40 centimeters shall prevail. The crutches should be held in the horizontal handle of the crutches, so that the body weight is not pressed into the crutch area of the armpit, which can sometimes cause “crutch axillary nerve palsy”. The time to use crutches should be in accordance with medical advice.