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| Property | Description |
|---|---|
| First Frame | First frame on which the operation is run |
| Last Frame | Last frame on which the operation is run |
| Marker diameter (mm) | Ensure the specified value corresponds to the diameter of the markers used (assuming they are applied directly to the skin surface). Note: If your marker has a base, to calculate the correct value, double the base width and add it to your marker diameter in mm. |
| Reaction reference frame | Determines which reference frame is used for reporting joint moments: Proximal segment: Reports all moments in the reference frame of the proximal segment. Distal segment: Reports all moments in the reference frame of the distal segment (for example, the tibia segment for the knee joint). Global frame: Reports the moment vector relative to the laboratory coordinate system. |
| Power Output | How Plug-in Gait is to output the power data: Standard: The joint power expressed as a single number (scalar). Individual Contributions from XYZ: The joint power expressed as individual X, Y, and Z planes in the segment's coordinate system |
| Anterior Thorax Tilt is Positive | Select this option to specify that the anterior thorax tilt is positive. Clear this option to specify that the anterior thorax tilt is negative. |
| Output Joint Centers | Select this option to visualize the joint centers that are calculated by Plug-in Gait. |
| Output Segment Centers of Mass | Select this option to visualize the center of mass of each segment that is calculated by Plug-in Gait. |
| Allow cross-plate strikes | Select this option when a foot may be in contact with more than one force plate simultaneously; for example, the heel may land on the far side of one plate and then the toes roll onto the near edge of the subsequent plate. If you select this option, reactions from the two plates are combined during processing, with the plate that is struck first being considered the primary. The forces reported by each plate are added together; the moments are also combined by referring the moment from the secondary plate back to the origin of the primary plate. In effect, the two plates are treated as a single force plate with the same origin as the primary plate. For more information, see Cross-plate foot strikes. Although every effort has been made to ensure the mathematical combination of forces and moments between two plates is correct, it is the responsibility of the operator / analyst to review the outcomes produced by this process and ensure they are correct. Use of this option in clinical assessments is strictly at the discretion of the operator/analyst. |
| Radius of Gyration: Pelvis and Thorax | The default radius of gyration for the specified segments. The number is scaled to the length of the segment. The Plug-in Gait default setting (0.31) means that the radius of gyration is 31 percent of the segment length. Only change this setting if you are sure that the default value is incorrect. |
| Version | Plug-in Gait version number. |
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Cross-plate foot strikes
To perform an inverse reaction calculation from a foot strike, forces and moments recorded by a force plate must:
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