Is a simultaneous intervention of triamcinolon injections with standardised exercises more effective compared to the usual care according to the Dutch College of Family Physicians standard in patients with shoulder complaints? A prospective, single blind, randomised clinical trial

INTERVENTION: Group A: the patients will be injected with a combination of lidocaine and 1 ml kenacort A40 and at the same time exercises Group B: the patient will be injected with a combination of lidocaine and 1 ml Kenacort A40 and after six weeks according to the NHG‐standard with exercises CONDITION: Triamcinolon injections, Dutch College of Family Physician (NHG) standard, complaints of shoulder, exercises, efficacy ; Musculoskeletal Diseases ; Shoulder complaints PRIMARY OUTCOME: The primary outcome is the change in pain in rest, during activities or during the night of the last 24 hours, between baseline and 78 weeks. SECONDARY OUTCOME: Change compared to the baseline assessments of:; 1. Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire; 2. Short Form health survey (SF‐36) questionnaire; 3. Analgesic use; 4. Participant rated improvement; 5. Range of motion maesurements; 6. Painful‐arc; 7. Complications of injections INCLUSION CRITERIA: 1. Patients with shoulder complaints consulting their General Practitioner (GP) 2. Presence of painful‐arc and restricted range of motion