General should select scalable, adjustable length axillary crutch, according to height appropriate adjustment.
Three methods as below:
A. Standing position, in the armpit and axillary crutches set aside 5cm gap (about three fingers height), the top of the rod to the foot of the distance is the height of the crutch.
B. Horizontal position, the measurement should be based on the above, increase the height of 2cm shoes
C. Height minus 41cm