Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Paediatrics
Abstract number: 26108
EARLY RADIOGRAPHIC OUTCOME AFTER TREATMENT FOR NEONATAL
INSTABILITY OF THE HIP
Daniel WENGER
Dept. of Orthopaedics, Malmö, Skåne University Hospital, Malmö (SWEDEN)
Introduction: Developmental dysplasia of the hip (DDH) is a spectrum of hip joint
disease in children, including morphologic changes of the joint, instability and
dislocation. As much as 29% of all total hip arthroplasties in patients less than 60
years old are due to DDH. Screening and early treatment of neonatal instability of the
hip (NIH) decreases the incidence of DDH. Objective: To determine whether infants
with NIH who were treated with an abduction splint would have normal radiographic
outcome at 1 year. Methods: All patients with suspected NIH that were admitted to
our clinic between April 1st 2002 and December 31st 2007 were reviewed for x-ray
files. Measurements of the acetabular index (AI) were compared between cases with
dislocated/dislocatable, unstable and normal hips.Results: The incidence of NIH was
7 per 1000 born infants with a referral rate of 15 per 1000. 82% of those treated were
girls. The AI was higher in children with dislocated / dislocatable hips (mean ±SD:
25,0 ±4,0) than in the control group (22,4 ±3,9) (p = 3,6E-11). Girls had a higher
mean AI than boys and left hips had a higher mean AI than right hips which is in
accordance with previous findings. Conclusion: This study shows that even for
children diagnosed and treated from the first days of life, radiological differences in
acetabular shape are persistent at 1 year of age. The importance of these diffences
for future hip function is unknown and warrants further study.
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