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Background <p>This study investigated the effects of static quadriceps angle (Q-angle) and body composition on dynamic landing mechanics in young female athletes.</p> Methods <p>Twenty-four right-limb dominant female athletes (age: 17.04 ± 0.36 years, BMI: 20.65 ± 2.62) participated. Body composition was assessed via bioelectrical impedance. Static Q-angle, frontal plane projection angle (FPPA), and Landing Error Scoring System (LESS) scores during a drop vertical jump were analyzed using 120 fps cameras and Kinovea software.</p> Results <p>Correlation analysis revealed significant negative relationships between right Q-angle and both right FPPA (rho = -0.440, <i>p</i> = .031) and left FPPA (rho = -0.490, <i>p</i> = .015). A significant positive correlation was found between body fat percentage and LESS scores (<i>r</i> = .521, <i>p</i> = .009). The regression model explained 22.6% of variance in right FPPA, showing a near-significant exploratory trend for right Q-angle (beta = -0.394, <i>p</i> = .060). ROC analysis suggested a potential, exploratory threshold value of 15.00 degrees for right Q-angle to detect high-risk landing mechanics (LESS &gt; 6), yielding 78.6% sensitivity and 60.0% specificity, although the model did not reach formal statistical significance (<i>p</i> = .143).</p> Conclusions <p>While the static Q-angle demonstrates a preliminary correlation with dynamic knee valgus tendencies in the dominant limb, non-significant predictive models prevent its use as a definitive standalone screening tool at this stage. Conversely, an elevated body fat percentage independently impairs overall movement quality rather than altering specific frontal plane joint angles.</p> Trial registration <p>Not applicable.</p>

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Does the static Q angle reflect dynamic landing mechanics?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月17日

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  • Burak Tas,
  • Onur Yıldırım,
  • Şevval Özkan

摘要

Background

This study investigated the effects of static quadriceps angle (Q-angle) and body composition on dynamic landing mechanics in young female athletes.

Methods

Twenty-four right-limb dominant female athletes (age: 17.04 ± 0.36 years, BMI: 20.65 ± 2.62) participated. Body composition was assessed via bioelectrical impedance. Static Q-angle, frontal plane projection angle (FPPA), and Landing Error Scoring System (LESS) scores during a drop vertical jump were analyzed using 120 fps cameras and Kinovea software.

Results

Correlation analysis revealed significant negative relationships between right Q-angle and both right FPPA (rho = -0.440, p = .031) and left FPPA (rho = -0.490, p = .015). A significant positive correlation was found between body fat percentage and LESS scores (r = .521, p = .009). The regression model explained 22.6% of variance in right FPPA, showing a near-significant exploratory trend for right Q-angle (beta = -0.394, p = .060). ROC analysis suggested a potential, exploratory threshold value of 15.00 degrees for right Q-angle to detect high-risk landing mechanics (LESS > 6), yielding 78.6% sensitivity and 60.0% specificity, although the model did not reach formal statistical significance (p = .143).

Conclusions

While the static Q-angle demonstrates a preliminary correlation with dynamic knee valgus tendencies in the dominant limb, non-significant predictive models prevent its use as a definitive standalone screening tool at this stage. Conversely, an elevated body fat percentage independently impairs overall movement quality rather than altering specific frontal plane joint angles.

Trial registration

Not applicable.