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Semiautomatic classification of acetabular shape from three-dimensional ultrasound for diagnosis of infant hip dysplasia using geometric features

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International Journal of Computer Assisted Radiology and Surgery Aims and scope Submit manuscript

Abstract

Purpose

Developmental dysplasia of the hip (DDH) is a congenital deformity which in severe cases leads to hip dislocation and in milder cases to premature osteoarthritis. Image-aided diagnosis of DDH is partly based on Graf classification which quantifies the acetabular shape seen at two-dimensional ultrasound (2DUS), which leads to high inter-scan variance. 3D ultrasound (3DUS) is a promising alternative for more reliable DDH diagnosis. However, manual quantification of acetabular shape from 3DUS is cumbersome.

Methods

Here, we (1) propose a semiautomated segmentation algorithm to delineate 3D acetabular surface models from 3DUS using graph search; (2) propose a fully automated method to classify acetabular shape based on a random forest (RF) classifier using features derived from 3D acetabular surface models; and (3) test diagnostic accuracy on a dataset of 79 3DUS infant hip recordings (36 normal, 16 borderline, 27 dysplastic based on orthopedic surgeon assessment) in 42 patients. For each 3DUS, we performed semiautomated segmentation to produce 3D acetabular surface models and then calculated geometric features including the automatic \(\mathrm{a}\)lpha (AA), acetabular contact angle (ACA), kurtosis (K), skewness (S) and convexity (C). Mean values of features obtained from surface models were used as inputs to train a RF classifier.

Results

Surface models were generated rapidly (user time 46.2 s) via semiautomated segmentation and visually closely correlated with actual acetabular contours (RMS error 1.39 ± 0.7 mm). A paired nonparametric u test on of feature values in each category showed statistically significant variation (p < 0.001) for AA, ACA and convexity. The RF classifier was 100 % specific and 97.2 % sensitive in classifying normal versus dysplastic hips and yielded true positive rates of 94.4, 62.5 and 89.9 % for normal, borderline and dysplastic hips.

Conclusions

The proposed technique reduces the subjectivity of image-aided DDH diagnosis and could be useful in clinical practice.

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Acknowledgements

We thank Dr. Pierre Boulanger (Professor, Department of Computing Science) and Dr. Richard Thompson (Associate Professor, Department of Biomedical Engineering) for their insight and expertise that greatly helped in this research.

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Correspondence to Abhilash Rakkunedeth Hareendranathan.

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Funding

This work was funded in part by the CIHR– Sick Kids Foundation New Investigator Research Grant 201401SKF and Capital Health Endowment in Diagnostic Radiology, Radiologic Society of North America (RSNA) Research Seed Grant and Servier Canada

Conflict of interest

The authors Abhilash Rakkunedeth Hareendranathan, Dornoosh Zonoobi, Myles Mabee, Chad Diederichs, Kumaradevan Punithakumar, Michelle Noga and Jacob L. Jaremko declare that they have no conflict of interest

Ethical approval

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 (5).

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Informed consent was obtained from all patients for being included in the study

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Hareendranathan, A.R., Zonoobi, D., Mabee, M. et al. Semiautomatic classification of acetabular shape from three-dimensional ultrasound for diagnosis of infant hip dysplasia using geometric features. Int J CARS 12, 439–447 (2017). https://doi.org/10.1007/s11548-016-1510-4

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  • DOI: https://doi.org/10.1007/s11548-016-1510-4

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