This is a double-blinded study of subacromial corticosteroid injection (steroid injection to the shoulder) to treat shoulder pain in the paralyzed (hemiplegic) shoulder of chronic stroke survivors. This study is designed to evaluate pain relief of a standard steroid injection treatment, compared to a high dose treatment and a low dose treatment, for shoulder pain in stroke survivors. A total of 105 chronic stroke survivors with moderate to severe shoulder pain will be enrolled. All eligible participants will undergo an initial test injection to localize pain to the subacromial space. If this turns out to be positive, the subjects will be randomly assigned to one of three groups: