LAUSR

OBJECTIVE To verify the suitability and reliability of YouTube videos pertaining to the five most commonly used knee stability tests for educational purposes. DESIGN Cross-sectional observational study. SETTING YouTube videos were categorized into two groups according to their sources: professional and non-professional groups. Only videos that satisfied the purpose and procedure parts among comprehensiveness scores were defined as suitable for educational purposes. For evaluating the reliability, the modified DISCERN was used. One-way analysis of variance and Kruskal-Wallis test were used to compare continuous and categorical variables, respectively. PARTICIPANTS Two hundred eighteen videos from November 13, 2019 to November 17, 2019, a research of YouTube videos was done using the following keywords; "anterior drawer test knee," "Lachman test knee," "posterior drawer test," "valgus knee test," and "varus knee test." INTERVENTIONS Not-applicable. MAIN OUTCOME MEASURES Comprehensiveness score that focused on the purpose, procedure, interpretation, and limitations/precautions of the test were developed by the authors, and modified DISCERN score. RESULTS According to the suitability for educational purposes, 126 (58%) videos were classified into the suitable group and 92 (42%) into the unsuitable. Neither group had significantly more views, views per posting days, likes, dislikes, or posting days. When comparing the comprehensiveness and reliability scores of each group, significant differences between groups were identified. Only 47 videos met the limitations/precautions category. One hundred fifty-five videos (71%) were from the professional group and 63 videos (29%) were from the non-professional group. Significant differences were found in views, views per posting days, likes, and dislikes between the professional group and non-professional group. CONCLUSION YouTube should not be used for learning about knee stability tests. Professionals, especially those in rehabilitation medicine, should pay more attention to uploading high-quality videos with reliable content.