Table 1.

Items and scoring criteria of the QA-SIVAS scale

No.	Item	When to score ‘yes ‘	Purpose
1	Objective stated	The study’s aims OR hypotheses are clearly stated	To indicate the overarching purpose of the study
2	A representative sample was chosen	The study considers a homogenous group of athletes with systematic registration of injuries; the number of injuries investigated and video recordings accessible is stated Example: Professional female football players (homogenous group of athletes) with 20 anterior cruciate ligament ruptures (systematic registration of injuries, number of injuries investigated), ten out of which were recorded on video (number of video recordings accessible)	To ensure reliable data acquisition
3	Information about sample is included	Characteristics of the study population are included (at least age, sex, sport, performance level, and sample size are stated)	To support interpretation and differentiation of the results
4	Information about video source and quality of the footage are included	Source (e.g., television or private recording, video platform) AND quality of video footage are described (all of the following are described: sampling frequency, quality of resolution and number and type of camera views); if mixed datasets are used, minimum and maximum values of the features are reported	To enhance objectivity of the observations
5	Applied methods are described comprehensively	A clearly structured, detailed outline of the study protocol AND the process of video analysis is stated	To provide a basis for comparisons with similar studies
6	A systematic approach to video analysis was chosen	A systematic approach to video analysis is used (e.g., checklist, observation form) AND clearly defined observation criteria are used (e.g., definition of injury mechanism and/or pattern)	To enhance objectivity of the observations
7	Medical report information is included	Study included medical report information (e.g., confirmation of diagnosis, injury location, type, diagnosis) either directly (extraction from medical reports) or through communication with medical professionals	To support interpretation and differentiation of the results
8	Background/expertise of rater(s) is stated	Relevant occupation (e.g., physician, sports scientist, physiotherapist) AND experience (or training in video rating) of the video rater(s) in the specific domain are reported	To evaluate the expertise of the rater
9	Findings are observed by more than one researcher	It is clearly stated that two or more raters independently made the observations	To enhance reliability of the observations
10	A control group is included	A control group with similar situations and/or biomechanics not resulting in injury is included (e.g., landing with a straight leg)	To enable the derivation of causal relationships and to avoid misinterpretation of findings
11	A quantitative biomechanical analysis was conducted using validated methods	Quantitative descriptions of biomechanics are included (e.g., joint angles and/or kinematics) AND have been created using validated methods (validity and reliability of the methods is reported in the methods section)	To enhance understanding of the findings
12	The main results of the study are clearly described	Results are described with a clear structure AND figures or tables are included	To avoid misleading interpretation of results
13	Absolute numbers or proportions of injury cases (for each/the main outcome) are reported	Absolute numbers OR proportions (percentage) of injury cases are included, mechanisms (e.g., non-contact vs contact) and/or pattern (e.g., knee valgus pattern vs hyperextension pattern) are reported	To allow interpretations about the frequency of a finding
14	Details about the injury context are included	Information about the injury context/situation (e.g., player action, match or training injuries, time in game, hours of exposure during game/training) are included	To enhance understanding of the findings
15	Example screenshots/video frames are included	Example screenshots/video frames of the observed injury-specific outcomes of interest are included (e.g., injury mechanisms and/or pattern)	To overcome communication barriers and to communicate research with a broad readership
16	Findings are discussed within the context of the current evidence	Other relevant trials relating to the field of study are stated and discussed	To point out the studies' contribution to what was already known
17	Clinical/practical implications of the results are discussed	Information on how to use study findings in clinical/sports practice are discussed	To help the transfer of findings into practice
18	Limitations of the study are addressed	Weaknesses OR methodological shortcomings are reported	To avoid misinterpretation of findings and to identify the need for future studies