This trial compares two types of injections for shoulder osteoarthritis. It targets patients with moderate to severe pain and limited mobility. One injection combines a lubricating substance with an anti-inflammatory drug, while the other uses only an anti-inflammatory drug. The goal is to see which injection provides better pain relief and improves joint function. Diclofenac etalhyaluronate (DF-HA) has been studied for its effectiveness and safety in treating osteoarthritis in various joints, showing significant pain relief particularly in the hip joint.