Inclusion Criteria:  patients aged 18-65, who were suffering from shoulder pain for more than three months and who were diagnosed with IS. All patients included in the study were diagnosed with IS using Shoulder Magnetic Resonance imaging.  Exclusion Criteria:  the presence of cervical radiculopathy; undergoing shoulder operation before; the presence of central nervous system or the presence of rheumatological disease, and polyneuropathy; receiving physical therapy in the shoulder area with a diagnosis of IS within the last six months; and receiving any injection therapy in the past.