Reduced acetabular depth in hip instability in the newborn.

This study assessed the frequency of ultrasonographic hip instability and compared the results with clinical and morphological ultrasonographic evaluations of the hip in the newborn infant. Hip stability in 2016 consecutive births (1074 boys and 942 girls) was assessed clinically and ultrasonographically. Ultrasonography included dynamic stability testing and morphologic evaluations.

The impact of intra-uterine factors on neonatal hip instability. An analysis of 1,059,479 children in Norway.

The records of the Medical Birth Registry of Norway from 1970 through 1988 contain information on maternal health, course of delivery and health of 1,059,479 newborns. The overall prevalence at birth of neonatal hip instability (NHI) was 0.9 percent: 0.

Direct ultrasonographic measurement of femoral anteversion in newborns.

A direct method of ultrasonographic measurement of the anteversion angle of the femoral neck is presented. Normal values based on measurements in 30 random newborns with vertex presentation correspond well with figures from previous autopsy series. The femoral anteversion in breech presentation was found to be on average 10 degrees greater than in vertex presentation (p < 0.

Effect of effusion on hip joint stability in the newborn. A postmortal study.

In a postmortal study we found that 1 mL fluid injected through the triradiate cartilage into the hip joint of a newborn child was enough to cause instability. This instability persisted even after aspiration of the fluid. The findings were confirmed by ultrasonography.

The von Rosen splint compared with the Frejka pillow. A study of 408 neonatally unstable hips.

101 children in Tromsö, Norway, treated with the Frejka pillow for 4.5 months because of neonatal hip instability (NHI) were compared with 307 children in Malmö, Sweden, treated with the von Rosen splint for 3 months. The pelvic radiographs, taken when the treatment was terminated, were assessed by the acetabular index (AI) and the cases of failure were evaluated.