Joint angle is a fundamental measurement in biomechanics that quantifies the position of a joint by measuring the angle between two adjacent body segments. This measurement is essential for analyzing movement patterns, assessing technique, and evaluating range of motion.
Joint angles are typically measured in degrees (°) and can be assessed at any joint in the body, including:
- Knee angle: Between the thigh and lower leg
- Elbow angle: Between the upper arm and forearm
- Hip angle: Between the trunk and thigh
- Ankle angle: Between the lower leg and foot
In video analysis, joint angles are often calculated by identifying anatomical landmarks and computing the angle formed by three points. Modern software like KineVision can automatically track these angles frame-by-frame, providing precise measurements throughout a movement sequence.
Understanding joint angles is critical for:
- Technique analysis in sports performance
- Injury risk assessment
- Rehabilitation progress tracking
- Ergonomic evaluations
Changes in joint angles during movement provide insight into kinematics, coordination, and biomechanical efficiency.