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Do Different Two-Dimensional Camera Speeds Detect Different Lower-Limb Kinematics Measures? A Laboratory-Based

Abdulaziz Rsheed Alenzi1, Msaad Alzhrani2, Ahmad Alanazi2

  • 1Department of Physical Therapy, Move Comprehensive Sports Medicine Center, Riyadh 11564, Saudi Arabia.

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|March 17, 2025
PubMed
Summary

Higher frame rates (120 fps) improve the accuracy of assessing lower-limb injury risk factors in football players compared to standard rates (30 fps). This enhanced precision aids in injury prevention and return-to-play decisions.

Keywords:
biomechanicscameralower extremitysports injuriestwo-dimensional

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Injury Prevention

Background:

  • Football players face a high risk of lower-limb injuries, especially ACL tears, due to dynamic movements.
  • Accurate identification of injury risk factors is vital for effective prevention strategies.
  • Two-dimensional (2D) video analysis is commonly used for movement assessment in clinical settings.

Purpose of the Study:

  • To evaluate the impact of camera frame rate on the accuracy of key kinematic measurements.
  • To assess knee valgus, hip adduction (HADD), and lateral trunk flexion (LTF) in male football players.
  • To determine if frame rate variations affect injury risk assessment during single-leg landing and side-cutting tasks.

Main Methods:

  • Laboratory-based cross-sectional study with 29 male football players.
  • Kinematic data collected using 30 fps and 120 fps cameras during functional tasks.
  • Analysis of frontal plane projection angle (FPPA), HADD, and LTF using Quintic Biomechanics software.

Main Results:

  • Significant differences in FPPA were found between 30 fps and 120 fps for both single-leg landing (dominant and non-dominant legs) and side-cutting tasks.
  • Significant variations in lateral trunk flexion (LTF) of the right leg during side-cutting were observed between frame rates.
  • No significant differences in hip adduction (HADD) were detected across different frame rates.

Conclusions:

  • High-speed cameras (120 fps) provide more accurate kinematic assessments of lower-limb injury risk factors than standard frame rate cameras (30 fps).
  • Improved precision supports enhanced injury screening, rehabilitation monitoring, and return-to-play decisions.
  • Accurate biomechanical deficit identification is crucial for effective lower-limb injury prevention and management in athletes.