HUPS: Hyalgan Use in Painful Shoulder

Three-arm, parallel, double-blind, masked observer, randomized, PB-Saline controlled clinical trial. In order to avoid problems in the interpretation of the final results due to disparate enrollment from various centers, the number of patients enrolled per site will be the same per site. Study patients will be randomized to receive either 20 mg sodium hyaluronate, 3 i.a. sodium hyaluronate injections, followed by 2 PBSaline mock i.a. injections or 5 i.a. PB-Saline control injections. One investigator will administer the injection and the joint assessor will be blinded to the study. The anterior or posterior approach for the shoulder injection will be used.