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Trunk Stability
- Determine YZ values of pelvis and spine-high joint center values at timepoint of max knee flexion
- Calculate the difference in Y and Z between pelvis and spine-high joint centers
- Calculate trunk lean angle by inverse tangent of difference in Y over difference in Z
- If Trunk Lean is greater than 10, score is 0
- If Trunk Lean is less than 6, score is 2
- Otherwise score is 1
