Measure a spine X-ray in seconds.
Drop in a JPEG or PNG. Get a Cobb angle, sagittal vertical axis, or any linear distance — with calibration if you need real-world units. Powered by the same vertebra detector that runs in our clinician app.
How it works
- Drop in an image, or paste a screenshot. JPEG, PNG, or WebP — typically a phone photo of a film, a screenshot from a viewer (⌘V or Ctrl+V works anywhere on the page), or an exported study image. The file never leaves your browser.
- Smart Detect overlays vertebrae. Our spine-v3 model runs locally on your device and draws four corners on each vertebra it finds — useful as a guide for your clicks, and you can toggle it off any time.
- Click the tool, then click on the image. For Cobb, click two points along the upper endplate, then two along the lower endplate. The angle appears instantly.
Frequently asked
Is anything uploaded to a server?
No. The image is loaded into a browser canvas via
FileReader, and inference runs on your device using
ONNX Runtime Web.
The only network requests this page makes are for the page assets
and for the spine-v3.onnx model weights themselves
(about 11 MB, served from the SpineOS site).
Can I use this for clinical decisions?
No. SpineOS Measure is an educational tool. It is not a medical device, has not been cleared by the FDA, and must not be used to inform diagnosis or treatment. The clinical SpineOS planner has different controls, audit trail, and a clinician-confirmation gate.
How accurate is Cobb here?
The math is exact — angle between two lines defined by two points each — so the output is only as accurate as where you click. On the in-house bootstrap cohort, Cobb median error fell from 1.60° (spine-v2) to 1.30° (spine-v3) when corners came from the model. With careful manual clicks, sub-degree repeatability is achievable.