Ultrasound Guided Needling Versus Ultrasound Guided Corticosteroid Injection Alone, a Randomized Controlled Trial.

Inclusion Criteria: * Shoulder pain without improvement after 3 months despite conservative treatment * Calcification on x-ray (Gartner type I of II) and ultrasound in the supraspinatus tendon less than 6 weeks before the treatment * All patients are first seen and included by the orthopaedic surgeon Exclusion Criteria: * Previous operation of the shoulder * Previous ultrasound guided needling of the shoulder * Frozen shoulder * Last corticosteroid injection less than 3 months ago * Comorbidities of the painful shoulder on x-ray or ultrasound ( ruptured tendon, fracture, bursitis,...) * No informed consent * Pregnancy