The secondary aims are to identify prognostic factors of an occupational intervention using the baseline and follow-up participant-rated outcomes: pain, physically function, generic health status, fear avoidance behaviours, job satisfaction, work-ability, satisfaction with intervention, clinical examination and MRI findings. Among these variables, we also aim to identify subjects, who will benefit from such an occupational intervention, and the subjects, who already have a good prognosis and therefore have no need for a larger scale intervention.