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How to use BoneAge

1. Select or drag in a hand/wrist X-ray of a child or adolescent (a standard posteroanterior view of the left hand, the kind used for bone age reading). PNG and JPEG work.
2. Choose the patient's sex — skeletal maturation differs between boys and girls, so this matters to the estimate.
3. Press Assess bone age.

Understanding the result

• Overall bone age is the estimated skeletal age in years and months. It reflects how mature the bones look, which can differ from the child's actual (chronological) age.
• Dotted circles mark 17 anatomical regions: the finger joints, thumb, carpal bones, and the distal radius/ulna — the regions radiologists examine when grading bone age.
• The number beside each circle is that region's age estimate in years, shown relative to the overall estimate (each carries about ±8 months of uncertainty). Regions normally agree within roughly a year; a region a year or more ahead of or behind the rest may indicate uneven maturation and is worth a clinician's attention.
• How regions develop: bones mature on different schedules. The carpal (wrist) bones ossify mainly in early childhood, the finger joints (DIP, PIP, MCP) develop and then fuse through puberty, and the distal radius and ulna are the last growth plates to close, in late adolescence. The Regional development section under the result lists any regions running ahead of or behind the overall estimate.
• The model's typical error is about ±7 months (mean absolute error on held-out validation radiographs). Individual estimates can occasionally be off by considerably more.

Why was my image rejected?

BoneAge checks that the upload actually looks like a hand radiograph before analyzing it. Images are declined when they are in color (radiographs are grayscale), nearly uniform, or do not resemble the hand X-rays the model was trained on. If a genuine radiograph is declined, try a version with the full hand and wrist visible, reasonable contrast, and minimal text or markers burned into the image.

Growth & adult height

The Growth & Adult Height page takes a child's age, height, weight, and parents' heights, and shows CDC growth-chart percentiles for height, weight, and BMI, plus two adult height estimates: a projection along the child's current height percentile, and the mid-parental (Tanner) genetic target range. In the mobile apps the same feature is built in — open it with the Growth button (Android) or the Growth link in the top bar (iOS); it works fully offline and is free.

Mobile apps, subscription, and credits

• The iOS and Android apps run the same models fully on-device — images never leave your phone.
• Without a purchase, the apps confirm your image can be analyzed and show the detected regions. The full result (overall age plus per-region ages) requires either the Bone age pro subscription or a one-time 1 Credit purchase, which unlocks one full assessment.
• Manage or cancel the subscription in your App Store or Google Play account settings. Use "Restore Purchases" after reinstalling to recover an active subscription.

Good to know

• Left- and right-hand images both work.
• BoneAge is not a medical device and must not be used for clinical diagnosis. See Privacy & Terms.

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