Taking measurements

Once a radiograph is calibrated, the Measure tool unlocks several measurement modes. All values display in millimetres or degrees and scale automatically with zoom and rotation.

Measurement modes

Line

Distance between two points. Used for fragment length, plate span, bone width, and any general linear measurement.

Click once to place the first point, click again to place the second.

Circle

Diameter or radius of a circular feature — joint surfaces, medullary canals, or bone fragments.

Click and drag to define the circle, then release.

TPA (Tibial Plateau Angle)

Two-line construction used in TPLO planning. The TPA reading appears in degrees.

Refer to your standard TPLO planning references for target angles.

Tips

Loupe. Toggle the loupe (top-bar view settings) for precise endpoint placement on bony landmarks.
Snapping. Dragging an endpoint close to an existing measurement point snaps to it.
Visibility. Toggle all measurements on or off with the Show measurements button in the top bar if they’re cluttering the view.

After measuring

Measurements remain on the radiograph until deleted. Select and press Delete or Backspace to remove.
They live in image coordinates, not screen coordinates — they zoom, pan, and rotate with the radiograph.
Multiple measurements coexist on the same radiograph.

Editing a measurement

Move an endpoint: click and drag the small handle at either end.
Move the whole measurement: click and drag the line body.
Delete: select and press Delete or Backspace.