Introduction Adhesive capsulitis (AC), also called frozen shoulder, is commonly diagnosed clinically and characterized by a global reduction of passive ranges of movement without radiographic abnormality. However, due to the effect of muscle spasm and pain, and other pathologies causing similar restriction of movements, the clinical diagnosis of AC can be challenging. Only invasive imaging procedures such as arthrography and arthroscopy have been shown to provide a definitive diagnosis for AC. Recent Magnetic Resonance Imaging studies(1-3) and ultrasound imaging studies (4-6) have shown a promising sign of an increased thickness of the inferior glenohumeral capsule (IGHC) in patients with AC. However the sensitivity and specificity of this finding using ultrasound in identifying patients with AC has not been established. Aim To establish the reliability of the increased thickness of IGHC on ultrasound in identifying patients with clinical signs of adhesive capsulitis. Methodology This study will include all volunteer participants (40-70 years of age) with unilateral shoulder problems referred for shoulder ultrasound scans. Active and passive ranges of movements (ROMs) will be measured. The images of the IGHC, the coracohumeral ligament (CHL) and rotator interval (RI) will be obtained bilaterally for comparison. Participants will be asked to return for follow up scans and for measurements of ROMs at 6, 12 and 24 month intervals. All other imaging results and clinicians’ diagnosis if available will be recorded. Data Analysis Participants with a global restriction of passive ROMs with at least 50% restriction in two planes, one of which is external rotation with no abnormality seen on the radiograph will be classified into a group clinically suggestive of AC. The specificity and sensitivity of the thickening of IGHC in identifying this group will be established. The thickness of CHL and vascularity in RI will also be analysed in this group. The duration of symptoms at the first visit will be taken into account and the changes of these structures over the time will also be analysed. Results As this study will incorporate both clinical / physical and imaging findings, it is anticipated that the results of this study have potential to aid in diagnosis and treatment of AC without the use of invasive procedures. Data collection will commence in March, and preliminary results will be presented.