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J Pediatr Orthop. 1994 Jan-Feb;14(1):24-8.

Ultrasonographic hip morphometry in infants.

Author information

1
Department of Orthopaedics and Traumatology, Faculty of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, N.T.

Abstract

Ultrasonographic study of 463 normal children (926 hips) from birth to 6 months of age with equal sex distribution was performed. Hip morphometry, including Graf's alpha and beta angles. Morin's head coverage percentage, and head size were measured. Using the same technique, a group of 52 babies was measured longitudinally from birth to 6 months of age, with three measurements taken for each hip for a total of 312 measurements. Results showed that the boys had a consistently higher alpha angle, a lower beta angle, better head coverage, and larger head size through the 6 months. Differences between the right and left hips were only noted in the beta angle. The containment of the hip was found to increase rapidly in the first 4 months. Comparing data from the longitudinal versus the cross-sectional group, no statistically significant differences were detectable in all the parameters measured. Intraobserver variations were found to be best with alpha angle measurements, with a standard deviation of 3.22 degrees.

[Indexed for MEDLINE]

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