Background: Electrotherapy, corticosteroid, and hyaluronic acid have been used to treat subacromial impingement syndrome. However, we need to compare treatment options to provide the optimal results. This study aims to compare the effect of hyaluronic acid, corticosteroid, and electrotherapy in subacromial impingement syndrome.

Design: Ninety five patients were randomised into three equal groups according to treatment types. Hyaluronic acid (20 mg/2ml, three times one week apart) or corticosteroid (triamcinolone acetonide, 40 mg/ml, single dose) treatments were applied as subacromial injections. Electrotherapy consisted of 14 sessions TENS (20 min.), hotpack (20 min.) and ultrasound (1.5watt/cm2, 1 MHz, 6 min.). Patients were evaluated before treatment, one and four weeks post end of treatment. Visual Analogue Scale (VAS), range of motion (ROM), and Shoulder Disability Questionnaire (SDQ) were used as outcome measures.

Inclusion Criteria:

• The diagnosis of subacromial impingement syndrome

Exclusion Criteria:

• Patients aged <20 or >50 years or who have the following medical conditions were excluded: physical therapy or injection in the past 6 months, shoulder instability, acute trauma, adhesive capsulitis, psychiatric illness, diabetes mellitus, malignancy.