Could a nerve block boost frozen shoulder treatment?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients with shoulder pain and stiffness that has persisted for at least 2 months but less than 12 months, with a loss of passive range of motion in at least 2 planes (lateral rotation, medial rotation, abduction, forward flexion) of at least 30 degrees compared to the contralateral side * Patients between the ages of 18 and 65 * Patients enrolled in a social security program Exclusion Criteria: * \- Corticosteroid injection into the affected shoulder \< 4 months ago * History of any surgery on the affected shoulder within the past 12 months * Patients with a neuromuscular condition (neurological deficit) or shoulder condition (arthropathy) that could interfere with the assessment of the primary endpoint * Signs or risk of infection (bacterial-like infection and/or fever and/or antibiotic use) * Poor skin condition of the affected shoulder * Anticoagulation with VKAs or anti-Xa agents, or active bleeding disorder or one in remission for less than 5 years (malignant hematologic disorders, myelodysplasia, autoimmune thrombocytopenia) or chemotherapy (antiplatelet agents permitted except prasugrel and clopidogrel)\* * Uncontrolled hypertension, * Decompensated diabetes or diabetes at risk of decompensation, * Contraindications to diprosten, Kenacort, or lidocaine * Psychiatric conditions that may be exacerbated by corticosteroids * Pregnant or breastfeeding women, or women who refuse to use effective contraception * Individuals belonging to a vulnerable group as defined by Regulation (EU) No. 536/2014 and French law (See section 4.4 of the protocol) - - Patients unable to comply with the protocol requirements (see Section 4.4 of the protocol) * Patients participating in another clinical research protocol involving a drug or medical device * Patients who refuse to participate in the study