Shoulder arthritis comes in a variety of forms and can affect two separate parts of your shoulder joint. The first of these is the area where the collarbone meets the acromion, or the tip of the shoulder. The other part is the head of the upper arm bone, or the humerus. It's important to find out which part of your shoulder is affected and which kind of arthritis you're suffering from. Once your doctor knows this, they can advise you on which treatment methods will be beneficial and whether a shoulder brace will be helpful.