🧒 Pediatric Hip Reimers Migration Index & Acetabular Index
UsePediatric hip imaging: infant hip ultrasound and pediatric AP pelvis — DDH screening and cerebral palsy hip s…
SourceWynter M, et al. Australian hip surveillance guidelines for children with cerebral palsy: 5-year re…
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
Supine standard AP pelvis, legs extended together, patellae forward.
When to use
Pediatric hip imaging: infant hip ultrasound and pediatric AP pelvis — DDH screening and cerebral palsy hip surveillance.
How it works
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
Key points
- 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.
References
- [Guideline / primary source]Wynter M, et al. Australian hip surveillance guidelines for children with cerebral palsy: 5-year review. Dev Med Child Neurol 2015;57:808-820
- Reimers J. The stability of the hip in children: a radiological study of the results of muscle surgery in cerebral palsy. Acta Orthop Scand Suppl 1980;184:1-100
- Tönnis D. Normal values of the hip joint for the evaluation of X-rays in children and adults. Clin Orthop Relat Res 1976;(119):39-47
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
Verification & sources · governance
FAQ
Frequently asked questions
- 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）