Background: Frozen shoulder is a common condition, characterized by pain and restriction in shoulder movements. Different non-surgical and surgical methods are used to overcome this condition. Given the high prevalence of frozen shoulder among the working class in communities, re-empowerment is essential for individuals to return to their daily activities. Considering the contradictory results reported by previous research, further investigations are required in this area. Therefore, this study aimed to evaluate the clinical findings of arthroscopic release in treatment of primary frozen shoulder. Methods: This cross-sectional study was performed on all patients with primary frozen shoulder, referring to Bahonar and Shafa hospitals of Kerman, Iran. These patients were candidates for surgery due to unsuccessful supportive treatment. First, American shoulder and elbow surgeons (ASES) assessment form (score: 0 -100) and simple shoulder test (SST) (a 12-item questionnaire) were completed before surgery. Then, all the patients underwent arthroscopic release and examinations. The assessment forms were completed again 3 and 12 months after surgery.