Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database
Background: Developmental dysplasia of the hip (DDH) is a cluster of hip development disorders that affects infants. The incidence of DDH-related dislocation (DDH-dislocation) is reportedly 0.1–0.3%; however, the nationwide incidence of DDH-dislocation in Japan has not been previously reported. The...
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| Format: | Article |
| Language: | English |
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Japan Epidemiological Association
2023-04-01
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| Series: | Journal of Epidemiology |
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| Online Access: | https://www.jstage.jst.go.jp/article/jea/33/4/33_JE20210074/_pdf |
| _version_ | 1797851811490562048 |
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| author | Hiroki Den Junichi Ito Akatsuki Kokaze |
| author_facet | Hiroki Den Junichi Ito Akatsuki Kokaze |
| author_sort | Hiroki Den |
| collection | DOAJ |
| description | Background: Developmental dysplasia of the hip (DDH) is a cluster of hip development disorders that affects infants. The incidence of DDH-related dislocation (DDH-dislocation) is reportedly 0.1–0.3%; however, the nationwide incidence of DDH-dislocation in Japan has not been previously reported. The primary aim of this study was to report the nationwide incidence of DDH-dislocation in Japan using the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB), and to examine its regional variation across Japan. Methods: This was a retrospective birth cohort study using the NDB. Data on patients born between 2011 and 2013 and assigned DDH-dislocation-related disease codes during 2011–2018 were extracted. Among these, patients who underwent treatment for DDH-dislocation between 2011 and 2018 were defined as patients with DDH-dislocation. Results: Across the 2011, 2012, and 2013 birth cohorts, 2,367 patients were diagnosed with DDH-dislocation, yielding the nationwide incidence of 0.076%. Region-specific incidence rates were almost similar across Japan. Secondary analyses revealed that 273 (11.5%) patients were diagnosed at the age of ≥1 year. The effect of birth during the cold months on the incidence of DDH-dislocation was significant (relative risk [RR] = 1.89, 95% confidence interval [CI]: 1.75–2.06). The risk of DDH-dislocation among girls was approximately seven times higher than that among boys. Conclusion: This is the first study to report the nationwide incidence of DDH-dislocation in Japan, which was estimated at 0.076%. The regional variation was trivial and unlikely to be clinically significant. Thus, the incidence rates were approximately equal across all regions in Japan. |
| first_indexed | 2024-04-09T19:23:52Z |
| format | Article |
| id | doaj.art-dbef909c20f347078b3de3bf77997b2d |
| institution | Directory Open Access Journal |
| issn | 0917-5040 1349-9092 |
| language | English |
| last_indexed | 2024-04-09T19:23:52Z |
| publishDate | 2023-04-01 |
| publisher | Japan Epidemiological Association |
| record_format | Article |
| series | Journal of Epidemiology |
| spelling | doaj.art-dbef909c20f347078b3de3bf77997b2d2023-04-05T08:23:14ZengJapan Epidemiological AssociationJournal of Epidemiology0917-50401349-90922023-04-0133418619210.2188/jea.JE20210074Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National DatabaseHiroki Den0Junichi Ito1Akatsuki Kokaze2Department of Hygiene, Public Health, and Preventative Medicine, Showa University School of Medicine, Tokyo, JapanDepartment of Orthopaedic Surgery, National Rehabilitation Center for Children with Disabilities, Tokyo, JapanDepartment of Hygiene, Public Health, and Preventative Medicine, Showa University School of Medicine, Tokyo, JapanBackground: Developmental dysplasia of the hip (DDH) is a cluster of hip development disorders that affects infants. The incidence of DDH-related dislocation (DDH-dislocation) is reportedly 0.1–0.3%; however, the nationwide incidence of DDH-dislocation in Japan has not been previously reported. The primary aim of this study was to report the nationwide incidence of DDH-dislocation in Japan using the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB), and to examine its regional variation across Japan. Methods: This was a retrospective birth cohort study using the NDB. Data on patients born between 2011 and 2013 and assigned DDH-dislocation-related disease codes during 2011–2018 were extracted. Among these, patients who underwent treatment for DDH-dislocation between 2011 and 2018 were defined as patients with DDH-dislocation. Results: Across the 2011, 2012, and 2013 birth cohorts, 2,367 patients were diagnosed with DDH-dislocation, yielding the nationwide incidence of 0.076%. Region-specific incidence rates were almost similar across Japan. Secondary analyses revealed that 273 (11.5%) patients were diagnosed at the age of ≥1 year. The effect of birth during the cold months on the incidence of DDH-dislocation was significant (relative risk [RR] = 1.89, 95% confidence interval [CI]: 1.75–2.06). The risk of DDH-dislocation among girls was approximately seven times higher than that among boys. Conclusion: This is the first study to report the nationwide incidence of DDH-dislocation in Japan, which was estimated at 0.076%. The regional variation was trivial and unlikely to be clinically significant. Thus, the incidence rates were approximately equal across all regions in Japan.https://www.jstage.jst.go.jp/article/jea/33/4/33_JE20210074/_pdfdevelopmental dysplasia of the hipddhepidemiologynational databaseincidence rate |
| spellingShingle | Hiroki Den Junichi Ito Akatsuki Kokaze Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database Journal of Epidemiology developmental dysplasia of the hip ddh epidemiology national database incidence rate |
| title | Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database |
| title_full | Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database |
| title_fullStr | Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database |
| title_full_unstemmed | Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database |
| title_short | Epidemiology of Developmental Dysplasia of the Hip: Analysis of Japanese National Database |
| title_sort | epidemiology of developmental dysplasia of the hip analysis of japanese national database |
| topic | developmental dysplasia of the hip ddh epidemiology national database incidence rate |
| url | https://www.jstage.jst.go.jp/article/jea/33/4/33_JE20210074/_pdf |
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