Inclusion Criteria:  Clinically diagnosed with primary (idiopathic) AC, Pain and movement restriction in his or her shoulder for at least 3 months, Restriction of passive external rotation in the involved shoulder restricted with less than 50% of the contralateral shoulder, Normal radiography findings  Exclusion Criteria:  Both shoulders were involved, Other shoulder pathologies (glenohumeral osteoarthritis, calcific tendinitis, rotator cuff tear, etc.), Cervical radiculopathy, Brachial plexus lesion, Neuromuscular disorders, Inflammatory rheumatic disorders, Malignancy, Acute trauma, Patients who had fracture affecting the involved shoulder joint, patients who underwent a surgical intervention, patients who underwent intraarticular injection for the involved shoulder within the last 6 months, Patients who received physical therapy for the glenohumeral joint within the last 1 year, and Photoallergy