It involves injecting dye into the shoulder joint and then taking several X-rays. If the dye leaks out of the shoulder joint, it suggests that there is a tear in the rotator cuff tendons. In some cases, it is unclear whether the pain is coming from the shoulder or a pinched nerve in the neck. If the pain goes away immediately after the injection, then the bursa is the most likely source of the pain. Pain from a pinched nerve in the neck would almost certainly not go away after an injection into the shoulder.
Doctors usually start by prescribing conservative treatments.
You may be prescribed anti-inflammatory medications such as aspirin or ibuprofen. Resting the sore joint and putting ice on it can also ease pain and inflammation. If the pain doesn't go away, an injection of cortisone into the joint may help. Cortisone is a strong medication that decreases inflammation and reduces pain. Cortisone's effects are temporary, but it can give very effective relief in the short term.