Inclusion Criteria:  Patient diagnosed with unilateral frozen shoulder, age greater than or equal to 18 years. Diagnosis of frozen shoulder will be based on clinical examination (restriction of passive external rotation in the affected shoulder > 50% compared to opposite site), in the presence of normal plain radiographs (antero-posterior and axillary projections) (other than calcific tendinopathy).  Exclusion Criteria:  Age less than 18 years, lacking capacity/unable to give valid consent for participation, full thickness rotator cuff tear diagnosed on either Ultrasound scan or Magnetic Resonance Imaging, unable to complete follow up, unable to speak or read English, allergy to corticosteroid or local anaesthetic, simultaneous bilateral frozen shoulder.