article: PDF OnlyLate Diagnosis of Developmental Dislocation of the Hip in Norway During the Years 1980–1989Bjerkreim, Ingjald; Hagen, Øyvind H.*; Ikonomou, Nikolaos†; Kase, Trygve; Kristiansen, Tore‡; Årseth, Peder H.§Author Information National Centre of Orthopaedics, Sophies Minde, University of Oslo *Martina Hansens Orthopaedic Hospital, University of Oslo, Oslo, Norway †Buskerud Central Hospital, University of Oslo, Oslo, Norway ‡Hedmark Central Hospital, University of Oslo, Oslo, Norway §Oslo City Hospital, University of Oslo, Oslo, Norway Journal of Pediatric Orthopaedics B: Volume 2 - Issue 2 - p 112-114 Buy Abstract From 1980 to 1989, 141.893 newborns were screened for hip instability in Southeast Norway, a region with 34% of the country's population. The incidence of neonatal hip instability was 10.5 in 1,000 in both the first and second 5-year periods. Late diagnosed developmental dislocation of the hip (DDH) developed in 325 children: 2.3 in 1,000 (0.8 in 1,000 luxations and 1.5 in 1,000 subluxations). There were no significant differences in the two 5-year periods, and the incidence of late cases was about the same as in the 1960s and 1970s. Median age at diagnosis was 5 months; only 21 (6.5%) were detected after age 1 year. The proportion of females was 89.8%, and 7% had breech presentation as compared with 15.9% of the overall neonatal cases. The right side was affected in 30.8%, the left was affected in 35.4%, and both sides were affected in 33.8%. The results indicate that the hips of most infants who later develop DDH are stable at birth. Infant hips should therefore be examined at regular intervals at child welfare clinics. © Williams & Wilkins 1993. All Rights Reserved.