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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.
All 128 patients …
Correspondence to Birmingham Children's Hospital NHS Foundation Trust, Birmingham, UK
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