FAQs
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The table below displays the Lower Body Segment angles from Plug-in Gait.
All Lower Body angles are calculate in rotation order YXZ except for Ankle Angles which are calculated in order YZX.
As Euler angles are calculated, each rotation causes the axis for the subsequent rotation to be shifted. X’ indicates an axis which has been acted upon and shifted by one previous rotation, X’’ indicates a rotation axis which has been acted upon and shifted by two previous rotations.
Angles | Positive Rotation | Axis | Direction | Angles | Positive Direction | Axis | Direction | ||
LPelvisAngles | 1 | Anterior Tilt | Prg.Fm. Y | Anti-clockwise | RPelvisAngles | 1 | Anterior Tilt | Prg.Fm. Y | Anti-clockwise |
2 | Upward Obliquity | Prg.Fm. X’ | Anti-clockwise | 2 | Upward Obliquity | Prg.Fm. X’ | Clockwise | ||
3 | Internal Rotation | Prg.Fm. Z’’ | Clockwise | 3 | Internal Rotation | Prg.Fm. Z’’ | Anti-clockwise | ||
LFootProgressAngles | 1 | – | Prg.Fm. Y | RFootProgressAngles | 1 | – | Prg.Fm. Y | – | |
2 | – | Prg.Fm. X’ | 2 | – | Prg.Fm. X’ | – | |||
3 | Internal Rotation | Prg.Fm. Z’’ | Clockwise | 3 | Internal Rotation | Prg.Fm. Z’’ | Anti-clockwise | ||
LHipAngles | 1 | Flexion | Pelvis Y | Clockwise | RHipAngles | 1 | Flexion | Pelvis Y | Clockwise |
2 | Adduction | Pelvis X’ | Clockwise | 2 | Adduction | Pelvis X’ | Anti-clockwise | ||
3 | Internal Rotation | Pelvis Z’’ | Clockwise | 3 | Internal Rotation | Pelvis Z’’ | Anti-clockwise | ||
LKneeAngles | 1 | Flexion | Thigh Y | Anti-clockwise | RKneeAngles | 1 | Flexion | Thigh Y | Anti-clockwise |
2 | Varus/Adduction | Thigh X’ | Clockwise | 2 | Varus/Adduction | Thigh X’ | Anti-clockwise | ||
3 | Internal Rotation | Thigh Z’’ | Clockwise | 3 | Internal Rotation | Thigh Z’’ | Anti-clockwise | ||
LAnkleAngles | 1 | Dorsiflexion | Tibia Y | Clockwise | RAnkleAngles | 1 | Dorsiflexion | Tibia Y | Clockwise |
2 | Inversion/ Adduction | Tibia X’’ | Clockwise | 2 | Inversion/ Adduction | Tibia X’’ | Anti-clockwise | ||
3 | Internal Rotation | Tibia Z’ | Clockwise | 3 | Internal Rotation | Tibia Z’ | Anti-clockwise |