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Sonographic surveillance of children with mild stable hip dysplasia reduced the need for active treatment

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Randomised controlled trial.


Opaque, sealed and numbered envelopes.


Outcome radiograph assessment was blinded to any therapeutic intervention.


Paediatric radiology and outpatient department in a Norwegian university hospital.


128 infants aged 1–3 days old, with mild stable hip dysplasia defined ultrasonographically and clinically.


Either immediate abduction splinting for at least 6 weeks with subsequent sonography determining further treatment (control group), or active sonographic surveillance at 6 weeks and 3 months determining splinting (investigation group).


Radiographic appearance of the hips at 1 year, with groups being compared using the acetabular index, a measure of acetabular formation.

Follow-up period

1 year.

Patient follow-up

All 128 patients …

Correspondence to Birmingham Children's Hospital NHS Foundation Trust, Birmingham, UK

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  • Provenance and peer review Commissioned; internally peer reviewed.