Methods/design: This PhD-project consists of four coherent studies. 1) A methodological study evaluating the CMD-SQ (Common Mental Disorder - Screening Questionnaire) questionnaire by a test-retest study. 2) The main study, a prospective follow-up study, has the aim of investigating the correlation between patient anxiety and concern, their perceived quality of patient progress and the perceived efficacy of treatment. This correlation will be detected by means of five questionnaires: CMD-SQ, EQ-5D, SF-12, HVOK, OHS or OSS. 3) A study consisting of an explicit internal medical audit with the aim to investigate whether the medical assessment of patient efficacy of treatment is consistent with their own self-reported efficacy of treatment. 4) An intervention study designed as a randomized clinical trial. The aim is to investigate whether a targeted effort towards patients with a high score of CMD-SQ, i.e. patients with anxiety and concern, can increase their self-reported efficacies of treatment and their perceived quality of progress. A total of 800 hip- and shoulder-patients will be included.