Literature shows no difference in pain, functional outcome or kyphosis angle, therefore no potential risks are known comparing a brace and a functional treatment. Investigators aim that not using the TLSO results in similar functional outcome, pain and kyphosis angle, and less costs. Patients will be seen at first presentation and during two year follow up at the outpatient clinic at six standard care follow up moments. At these follow up moments a X-ray as part of standard care is made. At or just before each scheduled appointment they will fill in questionnaires taking from 15-45 minutes.