Background: Self-report questionnaires play an important role as outcome measures in shoulder research. Having an estimate of the measurement error of these questionnaires is of importance when assessing follow-up results after treatment and when planning intervention studies. The aim of this study was to cross-culturally adapt the Norwegian version of the OSS and WORC questionnaire and examine and compare agreement, reliability and construct validity of the diseasespecific shoulder questionnaire WORC with two commonly used shoulder questionnaires, SPADI and OSS, in patients with rotator cuff disease.

Objective To compare the effectiveness of radial extracorporeal shockwave treatment with that of supervised exercises in patients with shoulder pain. Design Single blind randomised study. Setting Outpatient clinic of physical medicine and rehabilitation department in Oslo, Norway. Participants 104 patients with subacromial shoulder pain lasting at least three months. Interventions Radial extracorporeal shockwave treatment: one session weekly for four to six weeks. Supervised exercises: two 45 minute sessions weekly for up to 12 weeks. Primary outcome measure Shoulder pain and disability index. Results A treatment effect in favour of supervised exercises at 6, 12, and 18 weeks was found. The adjusted treatment effect was −8.4 (95% confidence interval −16.5 to −0.6) points.

No significant difference was found between the SE and rESWT groups at the 1-year follow-up. More participants in the SE group had returned to work.