Hip Strategy

1. Determine XZ values of pelvis and spine-high joint center at timepoint of max knee flexion
2. Calculate the difference in X and Z between pelvis and spine-high joint centers
3. Calculate trunk angle by inverse tangent of difference in X over difference in Z
4. Determine XZ values of Ankle and Hip joint center values at timepoint of max knee flexion
5. Calculate the difference in X and Z between Ankle and Hip joint centers
6. Calculate shank angle by inverse tangent of difference in X over difference in Z
7. Compare shank angle to trunk angle
8. Metric calculated for Step Down, Drop Jump, Lateral Shuffle, Triple Jump, Deceleration, Cut.

• If trunk angle is greater than (shank angle + 10 degrees), score is 2.
• If shank angle is greater than (trunk angle + 10 degrees), score is 2.
• Otherwise, score is 1.

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