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. 2011 Nov;45(6):553-7.
doi: 10.4103/0019-5413.87131.

Reliability of ultrasonographic measurements in suspected patients of developmental dysplasia of the hip and correlation with the acetabular index

Cem Copuroglu  1 , Mert Ozcan, Bilal Aykac, Beyti Tuncer, Kenan Saridogan
Affiliations

Reliability of ultrasonographic measurements in suspected patients of developmental dysplasia of the hip and correlation with the acetabular index

Cem Copuroglu et al. Indian J Orthop. 2011 Nov.

Abstract

Background: Ultrasonography is accepted as a useful imaging modality in the early detection of developmental dysplasia of the hip (DDH). Early detection and early treatment of DDH prevents hip dislocation and related physical, social, economic, and psychological problems. The purpose of this study was to evaluate the reliability of ultrasonographic and roentgenographic measurements measured by seven different observers.

Materials and methods: The alpha angles of 66 hips in 33 patients were measured using the Graf method by seven different observers. Acetabular index degrees on plane roentgenograms were measured in order to assess the correlation between the ultrasonographic alpha angle and the radiographic acetabular index, which both show the bony acetabular depth, retrospectively.

Results: The interclass correlation coefficient, measuring the interobserver reliability, was high and statistically significant for the ultrasonographic measurements. There was a negative correlation between the alpha angle and the acetabular index.

Conclusions: Ultrasonography, when applied properly, is a reliable technique between different observers, in the diagnosis and follow up of DDH. When assessed concomitantly with the roentgenographic measurements, the results are reliable and statistically meaningful.

Keywords: Developmental dysplasia; acetabular index; hip; ultrasonography.

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Conflict of interest statement

Conflict of Interest: None.

Figures

Figure 1
Figure 1
Signing the deepest point of the acetabulum differed according to the observer. (a) Some observers (4 of 7) signed the lower limb of the os ilium correctly. (b) Some observers (3 of 7) measured the ligament with the fovea centralis instead of the lower limb incorrectly
Figure 2
Figure 2
Signing the iliac bony rim differed according to the observer. (a) Some observers (3 of 7) signed the point where the concavity of the rim turns to convexity correctly. (b) Some observers (4 of 7) signed the strict corner of the iliac bony rim incorrectly
Figure 3
Figure 3
Sample for the negative correlation between the acetabular index and alpha angle. When the alpha angle increases, acetabular index degree decreases
See this image and copyright information in PMC

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