The Victorian Institute of Sport Assessment-Gluteal Questionnaire (VISA-G) questionnaire have already been developed and used as a measurement tool in research on English speaking Greater trochanteric pain syndrome (GTPS) populations.~The aim of this study is to translate, cross-cultural adapt and validate the Norwegian VISA-G (VISA-N-G) questionnaire.~The translation of the original VISA-G into Norwegian has been done following the official guidelines.~The patients will be recruited from the outpatient clinic at the Department of Physical Medicine and Rehabilitation, Oslo University Hospital and will follow the ordinary patient care.~After given written consent, patients will be asked to fill out the following Norwegian questionnaires: VISA-N-G, Harris Hip Score (HHS), Oswestry disability index (ODI) and a numeric rating scale (NRS) for assessment of pain intensity. The aforementioned questionnaires will be used to test the construct validity with various hypothesis at baseline. Within one week the investigators will ask the patients to fill out the VISA-N-G once more to test the test-retest reliability.~To investigate responsiveness the patient will be asked to fill out the VISA-N-G together With HHS, ODI, NRS and a 11-Point Global Rating of Change scale (GROC) after seven weeks. Responsiveness will be tested with various hypothesis and measured by the area under the receiver operating characteristics curve (ROC).
The aim of this study is to translate, cross-cultural adapt and validate the Norwegian VISA-G (VISA-N-G) questionnaire. The study will test the psychometric properties for the VISA-N-G in terms of test-retest reliability, internal consistency, construct validity and responsiveness.