For the Graf method · Infant hip ultrasound
Graf angles, measured on your phone.
An educational tool for clinicians and students. Import an infant hip ultrasound, place the three reference lines, and see the alpha (α) and beta (β) angles with the Graf type — in seconds.
Available on Android · Free to start
On Google Play as “Hip Angle Graf Ultrasound calc”
How it works
Three steps from image to classification.
- 1
Import the ultrasound
Load a standard-plane hip ultrasound from your gallery, camera, or receive it directly from your ultrasound system via DICOM.
- 2
Place the reference lines
Draw the baseline along the iliac bone, then the bony roof line and the cartilage roof line. Zoom in for precise placement.
- 3
Read the angles and Graf type
HipAngle Pro calculates α and β and shows the matching Graf type (I–IV) with a reference guide — ready to save or share as a PDF report.
Built around the Graf method
Everything you need to learn, practise and document hip ultrasound measurements.
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Alpha & beta angles
Precise α and β measurement from the three reference lines, with normal ranges (α ≥ 60°, β ≤ 77°) shown alongside.
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Graf classification I–IV
Automatic mapping of your angles to Graf types I, IIa, IIb, IIc, IId, III and IV, including the age-dependent IIa/IIb distinction.
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Built-in reference guide
Measurement tips and a Graf reference chart at your fingertips — ideal for training and revision.
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PDF report & sharing
Generate a clean Graf Hip Classification Report with the image, lines, angles and type. Share by email or any app. (Pro)
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DICOM receive
Turn your phone into a DICOM receiver on your local network and send images straight from your ultrasound machine or PACS. (Pro)
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Offline & private
Works fully offline. Images and data stay on your device — nothing is uploaded to our servers.
Who it's for
- Paediatric orthopaedic surgeons
- Radiologists and sonographers
- Paediatricians performing hip screening
- Residents and students learning the Graf method
Available in 14 languages
English, Deutsch, Français, Italiano, Español, Ελληνικά, Polski, Magyar, Čeština, Română, Slovenčina, Slovenščina, Srpski, Bosanski.
HipAngle Pro subscription
Measurement and classification are free. Pro unlocks professional documentation and workflow tools.
- PDF Graf Hip Classification Report
- Share reports by email or any app
- DICOM receive from your ultrasound system
Free trial available. Subscriptions auto-renew until cancelled — cancel anytime in Google Play.
Medical disclaimer
HipAngle Pro is intended exclusively as an educational tool to support understanding of the Graf method for developmental dysplasia of the hip (DDH). It is designed for use by trained healthcare professionals or students in a supervised clinical or academic environment.
The visualisations, measurements and classifications shown in the app are provided for training and documentation support only. They are not intended for use in clinical diagnosis or patient treatment.
- This is not a medical device and has not been reviewed or approved by the FDA, EMA or any regulatory authority.
- All calculations are for educational reference only and must not be used to inform or guide real-world clinical decisions.
- The accuracy of any measurement depends on image quality and correct anatomical line placement, which may vary across users.
- Final diagnostic and treatment decisions must be made by licensed healthcare professionals using approved clinical tools.