If you are experiencing upper arm soreness, armpit chafing, or numbness and tingling in your hands, check your posture and positioning on the crutches. Remember to stand tall and not slouch on the crutch arms. In proper posture and crutch positioning, you should be able to place two to three fingers between the armpit and the top of your crutch.
With your arms stretched along the body and relaxed, the crutch hand grip should be level with your wrist. Holding the hand grips, you should keep your elbows slightly bent (about 30 degrees.)
This encourages your arm muscles to do the work and decreases the stress on your wrists. As you move between different shoes and sneakers, you may see that your height changes. For example, a running sneaker usually has a higher heel than a street flat soled sneaker. Here you may need to make alterations to your crutches to maintain ideal crutch positioning