Pediatric Hip Reimers Migration Index & Acetabular Index — free guideline decision tool
Enter femoral-head width lateral to Perkins' line and total head width: Reimers migration index (cerebral palsy hip surveillance); optionally acetabular index by age. Includes how to measure and what each value means. Instant, browser-side.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Head width lateral to Perkins A | 6 mm |
|---|---|
| Total head width B | 20 mm |
| Age (for acetabular index) | 1–3 years |
| Acetabular index (1–3 y) | 22 ° |
→Reimers migration index30%
- Reimers migration index：30 % → 30–40%: hip at risk — refer, shorten surveillance interval
- Acetabular index (1–3 y)：22 ° → ≤ 25°: normal
Common questions
What is Pediatric Hip Reimers Migration Index & Acetabular Index?
Enter femoral-head width lateral to Perkins' line and total head width: Reimers migration index (cerebral palsy hip surveillance); optionally acetabular index by age. Includes how to measure and what each value means. Instant, browser-side.
How is Pediatric Hip Reimers Migration Index & Acetabular Index calculated? What is the core formula?
Reimers migration index < 30%: normal Reimers migration index 30–40%: hip at risk — refer, shorten surveillance interval Reimers migration index 40–90%: subluxation — consider preventive / reconstructive surgery Reimers migration index ≥ 90%: dislocation Acetabular index (< 1 y) ≤ 30°: normal Acetabular index (< 1 y) > 30°: dysplasia Acetabular index (1–3 y) ≤ 25°: normal Acetabular index (1–3 y) > 25°: dysplasia Acetabular index (> 3 y) ≤ 20°: normal Acetabular index (> 3 y) > 20°: dysplasia
When is Pediatric Hip Reimers Migration Index & Acetabular Index used?
Pediatric hip imaging: infant hip ultrasound and pediatric AP pelvis — DDH screening and cerebral palsy hip surveillance.
What are the key clinical points for Pediatric Hip Reimers Migration Index & Acetabular Index?
Supine standard AP pelvis, legs extended together, patellae forward. Each value is graded against published reference ranges. Measurement technique and positioning change the numbers — compare like with like on follow-up. Part of the YuanDoctor MSK measurement topic.
What are the limits and cautions when using Pediatric Hip Reimers Migration Index & Acetabular Index?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
Does Pediatric Hip Reimers Migration Index & Acetabular Index upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Pediatric Hip Reimers Migration Index & Acetabular Index calculated in practice? Can you show a worked example?
Inputs: Head width lateral to Perkins A 6 mm, Total head width B 20 mm, Age (for acetabular index) 1–3 years, Acetabular index (1–3 y) 22 ° → Result: Reimers migration index 30 %（Reimers migration index: 30 % → 30–40%: hip at risk — refer, shorten surveillance interval, Acetabular index (1–3 y): 22 ° → ≤ 25°: normal）
Run Pediatric Hip Reimers Migration Index & Acetabular Index now
Enter femoral-head width lateral to Perkins' line and total head width: Reimers migration index (cerebral palsy hip surveillance); optionally acetabular index by age. Includes how to measure and what each value means. Instant, browser-side.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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