If you are given an arm immobilizer instead of a traditional sling, you may be able to hang onto the walker lightly, though of course your operated arm should not take body weight or pressure. The immobilizer is a wide fabric band that goes around your waist to chest with velcro, it has a side band of velcro that straps your arm above your elbow tightly to the waist band, so your arm is totally rigid from shoulder to elbow. Then there is a separate small velcro wristband that allows you to stick your wrist onto the waistband in the traditional sling position. However, when needed, you can easily unstick your wrist to swivel your arm into a forward position for small tasks and perhaps to hold onto a walker. Do ask your doctor to explain if this is the type of sling you will be given.