A comparison of the effectiveness of lateral versus posterior approach to shoulder injection in patients with subacromial impingement syndrome: A pragmatic randomized controlled trial.

Objective: The aim of the study was to determine the effectiveness of the lateral approach to subacromial injection, compared with the posterior approach, for the treatment of subacromial impingement syndrome.

Method: A pragmatic randomized controlled trial was carried out in an outpatient community musculoskeletal service. The sample comprised 80 adults, aged 18 years or over, with subacromial impingement syndrome.