The severity of developmental dysplasia of the hip does not correlate with the abnormality in pelvic incidence
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(2020) 21:623
RESEARCH ARTICLE
Open Access
The severity of developmental dysplasia of the hip does not correlate with the abnormality in pelvic incidence Rongshan Cheng1,2†, Muyin Huang1,3†, Willem Alexander Kernkamp1,2, Huiwu Li2, Zhenan Zhu2, Liao Wang2* and Tsung-Yuan Tsai1,2*
Abstract Background: The purpose of this study was to investigate the association between the severity of Developmental dysplasia of the hip (DDH) and the abnormality in pelvic incidence (PI). Methods: This was a retrospective study analyzing 53 DDH patients and 53 non-DDH age-matched controls. Computed tomography images were used to construct three-dimensional pelvic model. The Crowe classification was used to classify the severity of DDH. The midpoint of the femoral head centers and sacral endplates were projected to the sagittal plane of the pelvis. The PI was defined as the angle between a line perpendicular to the sacral plate at its midpoint and a line connecting this point to the axis of the femoral heads. Independent sample ttests were used to compare the differences between the PI of DDH group and the non-DDH controls group. Kendall’s coefficient of concordance was used to determine the correlation between the severity of DDH and PI. Results: Patients with DDH had a significantly (p = 0.041) higher PI than the non-DDH controls (DDH 47.6 ± 8.2°, normal 44.2 ± 8.8°). Crowe type I patients had a significantly (p = 0.038) higher PI (48.2 ± 7.6°) than the non-DDH controls. No significant difference between the PI in Crowe type II or III patients and the PI in non-DDH controls were found (Crowe type II, 50.2 ± 9.6°, p = 0.073; Crowe type III, 43.8 ± 7.2°, p = 0.930). No correlation was found between the severity of DDH and the PI (r = 0.091, p = 0.222). Conclusions: No correlation was found between the severity of DDH and the PI. The study confirmed that the PI in DDH (Crowe type I) group was higher than that of the non-DDH control group, while the PI does not correlate with the severity of DDH. Keywords: Developmental dysplasia of the hip, Pelvic incidence, Severity of DDH, Crowe classification
* Correspondence: [email protected]; [email protected] † Rongshan Cheng and Muyin Huang contributed equally to this work. 2 Shanghai Key Laboratory of Orthopaedic Implants & Clinical Translation R&D Center of 3D Printing Technology, Department of Orthopaedic Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China 1 School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University; Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, Shanghai, China Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide
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