Table 1 Inclusion criteria

1. Article was published in English, French, German or Dutch and available as full text article.

2. The study included a PRO questionnaire specifically used for the evaluation of patients following hip arthroscopy

3. The main goal of the study was to evaluate the quality of a PRO questionnaire used for the evaluation of patients undergoing hip arthroscopy

4. The study used new data instead of data extracted from other research (for example systematic reviews)