CMAS is a valid and reliable screening tool for evaluating side-step cutting movement quality. A very large significant relationship was observed between CMAS and peak KAM. CMAS is a cost-effective and easily applicable field-based screening tool to identify athletes who generate high peak KAMs. CMAS allows practitioners to identify "high-risk" cutting mechanics in athletes. CMAS can be used as a potential technical framework for coaching "safer" cutting. Objective: To assess the validity of the cutting movement assessment score (CMAS) to estimate the magnitude of peak knee abduction moments (KAM) against three-dimensional (3D) motion analysis, while comparing whole-body kinetics and kinematics between subjects of low (bottom 33%) and high CMASs (top 33%). Design: Cross-sectional study. Setting: Laboratory Participants: Forty-one participants (soccer, rugby, netball, and cricket). Main outcome measures: Association between peak KAM and CMAS during a 90° cut. Comparison of 3D whole-body kinetics and kinematics between subjects with low (bottom 33%) and high CMASs (top 33%). Results: A very large significant relationship ( = 0.796, p < 0.001) between CMAS and peak KAM was observed. Subjects with higher CMASs displayed higher-risk cutting postures, including greater peak knee abduction angles, internal foot progression angles, and lateral foot plant distances (p = 0.032, effect size = 0.83-1.64). Additionally, greater cutting multiplanar knee joint loads (knee flexion, internal rotation, and abduction moments) were demonstrated by subjects with higher CMASs compared to lower (p = 0.047, effect size = 0.77-2.24). Conclusion: The CMAS is a valid qualitative screening tool for evaluating cutting movement quality and is therefore a potential method to identify athletes who generate high KAMs and "high-risk" side-step cutting mechanics.
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