Focal Vibration Therapy in Post-stroke Shoulder Pain

Inclusion Criteria: * Age ≥ 18 years * Ischemic or hemorrhagic stroke confirmed by CT or MRI * Chronic post-stroke phase (≥ 6 months from event) * Presence of hemiplegic shoulder pain (NRS ≥ 4) * Preserved cognitive function sufficient to provide informed consent Exclusion Criteria: * Severe cognitive impairment or language deficits (e.g., severe aphasia) that prevent understanding of study procedures or reliable reporting of pain (e.g., inability to complete NRS or questionnaires). * Severe neglect, apraxia, or disorders of consciousness that interfere with participation in rehabilitation or outcome assessments. * Pre-existing shoulder pathology of the affected side unrelated to stroke (e.g., full-thickness rotator cuff tear, advanced glenohumeral osteoarthritis, inflammatory arthritis, prior shoulder surgery). * Fixed shoulder contractures or severe joint deformities limiting passive range of motion and preventing standardized assessment. * Botulinum toxin injections to shoulder upper limb muscles within the last 3-4 months prior to enrollment . * Current treatment with other experimental or non-conventional physical therapies for shoulder pain during the study period.