Comparative outcomes of combined corticosteroid with low volume compared to high volume of local anesthetic in subacromial injection for impingement syndrome: systematic review and meta-analysis of RCTs.

Subacromial impingement syndrome (SIS) is one of the most frequent pathologies of the shoulder, which may cause serious restriction of daily activities and lifestyle changes. Corticosteroid injection (CI) into the subacromial space is a palliative treatment option. Currently, there have been no studies that compare between the different volumes of CI injection.