Ropivacaine Block Alone or With Perineural or Systemic Dexamethasone for Pain in Shoulder Surgery

25 ml ropivacaine 0.5%

8 mg dexamethasone (perineural)

8 mg dexamethasone (0.8 ml dexamethasone, 4.2 ml saline) to total volume of 5 ml (intravenous)

5 ml normal saline (intravenous)

0.8 ml normal saline (perineural)