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Tunnel Planning

Tunnel placement is a critical step in ligament reconstruction planning. NavNX provides tools to define, visualise, and validate tunnel parameters for both femoral and tibial tunnels.

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Adding a Tunnel

1

Open the tunnel tool

Click the Add Tunnel button in the toolbar and select the tunnel type: Femoral or Tibial.
2

Define the entry point

Click on the viewport (in any 2D view mode) to place the tunnel entry point on the bone surface.
3

Define the exit point

Click again to place the exit point. The tunnel trajectory is drawn as a line between these two points.
4

Review in the properties panel

The properties panel on the right displays the calculated tunnel parameters.

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Tunnel Parameters

The properties panel displays and allows editing of: You can edit coordinates and angles directly in the properties panel. Changes are reflected in real time across all views.

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Validation Warnings

NavNX validates tunnel parameters and displays warnings when values fall outside recommended ranges:
  • Tunnel length too short or too long for the selected implant
  • Diameter mismatch with the selected implant
  • Tunnel trajectory intersects the opposite cortex at an extreme angle
Validation warnings are advisory. Clinical judgement should always take precedence over automated checks.

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3D Visualisation

Tunnels are rendered as semi-transparent cylinders in the 3D and Bone views using VTK.js. The cylinder colour indicates the tunnel type:
  • Blue — femoral tunnel
  • Green — tibial tunnel
Orbit, pan, and zoom to inspect the tunnel trajectory from any angle. Tunnels update in real time as you adjust parameters.
Switch to the Bone 3D view after placing tunnels to verify that the trajectory avoids critical structures and that entry/exit points are correctly positioned on the cortical surface.