Concurrent Validity of The Expanded Cutting Alignment Scoring Tool (E-CAST).
Lauren Butler, Alexa Martinez, Ashley Erdman and 8 others
PMID 37795331WHAT IT FOUND
The E-CAST video checklist matched 3D movement measures during a planned cut in female athletes.
Sagittal items matched well; static knee valgus matched poorly.
Key findings
01Cut points were identified for all biomechanical variables, with sensitivity 70-85% and specificity 55-89%.
02AUC values ranged from 0.67 to 0.91 across E-CAST scoring items.
03Static knee valgus had AUC 0.67 and specificity 55%.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The sample was limited to female athletes aged 12 to 17 without recent lower limb injury or surgery, so it may not apply to other groups. Two athletes were removed for poor quality videos, so the final sample was 58 rather than 60. No power analysis was done before the study. The cut was planned, not reactive, and planned cuts have been reported to produce lower knee joint loads than unplanned cuts. Only one physical therapist scored the videos, so rater differences may change results. 2D video can lose a fully perpendicular frontal or sagittal view if the athlete rotates. Static knee valgus performed poorly, with AUC 0.67 and specificity 55%. The paper reports validation against 3D motion capture, not injury outcomes.
Declared interests
The authors report no competing interests.
The easy way to misread this
Do not treat E-CAST as proof that these movement faults cause ACL injury. The study compared video scores with 3D movement measures, not with ACL injuries, and static knee valgus matched poorly.