IOR Gait Planar Angles

This tutorial is a continuation of the IOR Gait Full Body Tutorial. This tutorial goes through computing planar angles with the IOR model, specifically looking at determining how different parts of the spine move relative to one another.

To calculate the orientation of the trunk segments, planar angles are calculated to determine the orientation of the various segments relative to one another. To calculate a planar angle, you need to either reference the ORIGINAL or PROCESSED folder when defining a target. If your targets have not been filtered or interpolated, you will not have a processed folder and will need to use the ORIGINAL. However, if you plan to process your target data in any way, you should do this now, prior to creating you planar angles.

The following abbreviations are used in naming the planar angles

• FE Flexion/Extension
• LB Lateral Bending
• AR Axial Rotation

1. Create RPV_AX:

1. Click Landmarks button
2. Click Add New Landmark button
3. Create Landmark: RPV_AX
   • Landmark Name: RPV_AX
   • Define Orientation Using:
   • Starting Point: LV5
4. Offset Using the Following ML\AP\AXIAL Offsets:
   • X: 0.0 Y: 0.0 Z: -0.05
5. Do NOT Check: Offset by Percent (1.0 = 100%) (Meters when not checked)
6. Do NOT Check: Calibration Only Landmark (Not generated for assigned motion file(s))

Below defines the orientation (flexion/extension) of the adjoining spine segments resolved in the pelvis coordinate system
NOTE: For the FE Planar Angles, the same definitions for the angles are used for both the left & right side. This means the different sets of signals do not need to be created for the left and right sides (as with the LB and AR planar angles).
NOTE-2: To access these dialogs, you need to edit a command pipeline, the "Compute_Planar_Angle" pipeline command.

2. Create Sp5_sp4_FE Planar angle:

1. Define Resulting Signal Name: Sp5_Sp4_FE
2. Calculate a 4 point angle between the following targets:
   1. TARGET::PROCESSED::TV7
   2. TARGET::PROCESSED::TV2
   3. TARGET::PROCESSED::CV7
   4. TARGET::PROCESSED::TV2
   • Angle Direction: Left Hand Rule
   • 3D Space: Always 0 to 180 degrees
   • Projected onto Plane: XY
   • Note: The Reference segment will need to be changed to RPV within the text option.

3. Create Sp4_Sp3_FE planar angle:

1. Define Resulting Signal Name: Sp4_Sp3_FE
2. Calculate a 4 point angle between the following
   1. TARGET::PROCESSED::LV1
   2. TARGET::PROCESSED::TV7
   3. TARGET::PROCESSED::TV2
   4. TARGET::PROCESSED::TV7
   • Angle Direction: Left Hand Rule
   • 3D Space: Always 0 to 180 degrees
   • Projected onto Plane: XY
   • Note: The reference segment will need to be changed to RPV within the text option

4. Create Sp3_Sp2_FE planar angle:

1. Define Resulting Signal Name: Sp3_Sp2_FE
2. Calculate a 4 point angle between the following targets:
   1. TARGET::PROCESSED::LV3
   2. TARGET::PROCESSED::LV1
   3. TARGET::PROCESSED::TV7
   4. TARGET::PROCESSED::LV1
   • Angle Direction: Left Hand Rule
   • 3D Space: Always 0 to 180 degrees
   • Projected onto Plane: XY
   • Note: The reference segment will need to be changed to RPV within the text option

5. Create Sp2_Sp1_FE planar angle:

1. Define Resulting Signal Name: Sp2_Sp1_FE
2. Calculate a 4 point angle between the following targets:
   1. TARGET::PROCESSED::LV5
   2. TARGET::PROCESSED::LV3
   3. TARGET::PROCESSED::LV1
   4. TARGET::PROCESSED::LV3
   • Angle Direction: Left Hand Rule
   • 3D Space: Always 0 to 180 degrees
   • Projected onto Plane: XY
   • Note: The reference segment will need to changed to RPV within the text option.

6. Create Sp1_Pel_FE planar angle:

1. Define Resulting Signal Name: Sp2_Sp1_FE
2. Calculate a 4 point angle between the following targets:
   1. LANDMARK::ORIGINAL::RPV_AX
   2. TARGET::PROCESSED::LV5
   3. TARGET::PROCESSED::LV3
   4. TARGET::PROCESSED::LV5
   • Angle Direction: Left Hand Rule
   • 3D Space: Always 0 to 180 degrees
   • Projected onto Plane: XY
   • Note: The reference segment will need to be changed to RPV within the text option.