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[Correspondence] Can Shoulder Arthroscopy Work? (CSAW) trial

We read with interest the Can Shoulder Arthroscopy Work? (CSAW) study by David Beard and colleagues (Jan 27, p 329).1 We note that 20 hospitals recruited fewer than ten patients with subacromial impingement over 3 years. More than a quarter of all patients (n=84, 27%) were recruited from one centre that was running the trial. Given the disparity in recruitment, we are concerned that patient selection criteria were not uniform in all participating centres. It is not specified whether other pathologies commonly associated with impingement, such as acromioclavicular joint and long head of biceps degeneration,2,3 were considered.