If the height is changed, the user will need to get used to the new height and might require help and encouragement. Also, stick lengths need to be carefully checked and adjusted for people recovering from strokes and required length may not change for a long time unless there is a significant change in the health condition.
The most effective method of checking the height is to stand in your regular footwear with your arms hanging relaxed with a slight natural bend at the elbow (flexed at 15 degrees). Have someone measure the distance between the wrist crease and the ground. This should be the length/height of the walking equipment.