This page walks you through modifying the default DSX Knee Model Template (MDH file) in Visual3D for use with different target labels.
Load Files
2. Load Static C3D file
- Model→
- Create (Add Static Calibration File)→
- Hybrid Model from C3DFile→
- Select a static trial collected in your lab
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3. Load DSX Model Template (.mdh file)
- Model→
- Apply Model Template→
- Browse to the DSX model template on your computer
- Note: There will be build errors, that's fine
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Update Segment Definition
1. In the Models tab, under the Segments button, in the Segments tab, there is a list of segments. These segments must be updated to reflect the new tracking target labels.
- To update each segment, double click on the desired segment name.
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- A. Update Pelvis Definition
- Select target labels from the drop down list which represent the ASIS/PSIS labels. If only using a sacrum label, enter the sacrum label into both the left and right sacrum boxes.
- If using other tracking targets (ex. iliac crest) specify them here.
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- B. Update Thigh Definition
- The LEFT_HIP and RIGHT_HIP landmarks are created from the pelvis, so do not modify these.
- In the Distal Joint and Radius section, specify the lateral and medial epicondyle knee targets.
- In the Tracking Targets section, click on the tracking targets.
- Note: When selecting tracking targets, you must click in the check box. Clicking on the target name will deselect all tracking targets.
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- C. Update Shank Definition
- The L/RKJC is a landmark created from the thigh, so do not modify this.
- In the Distal Joint and Radius section, specify the lateral and medial malleoli ankle targets.
- In the Tracking Targets section, click on the tracking targets.
- Note: When selecting tracking targets, you must click in the check box. Clicking on the target name will deselect all tracking targets.
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- Note: The L/RPT, Femur, Tibia and Patella segments should not be modified.
Update Model Metrics
1. Update the necessary model metrics. In the Models tab, under the Subject Data/Metrics button, in the Subject Data tab, there is a list of model metrics.
- To update each segment, double click on the desired segment name.
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- A. Update LTH_TRACKING_TARGET_TYPES
- This list should be identical to the tracking list selected in the dialog
- The default is shown below, but it should reflect the tracking list you selected for your marker set
- 'LANDMARK+TARGET+TARGET+TARGET+TARGET+TARGET+TARGET
- Click "OK"
- Note: The LEFT_HIP landmark and LLK, LMK, LTH1, LTH2, LTH3, LTH4 targets are used to track the thigh. Since there is one landmark, and six targets, the list should be LANDMARK + TARGET (listed six times). Landmark should always be listed first.
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- B. Update LTH_TRACKING_TARGET_LIST
- This list should be identical to the tracking list selected in the dialog
- The default is shown below, but it should reflect the tracking list you selected for your marker set
- 'LEFT_HIP+LLK+LMK+LTH1+LTH2+LTH3+LTH4
- Click "OK"
- Note: The single quote at the start of the line is important, this tells Visual3D the value is a string.
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- C. Update tracking list for right thigh and left/right shank segments
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- D. Update THIGH_SCALE (if necessary)
- This value will update automatically for every subject - but if you only have targets on ONE leg, you should remove the SEG_LENGTH for the segment you are not using.
- So if only using left side targets, specify this value as ( LTH_SEG_LENGTH * 0.5 ) / .404
- Note: You do not need quotes or single quotes here
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Save Updated Model Template
6. Save Updated Model Template
- Model→Save Model Template
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