Seasonal Trends in the Incidence of Hip Osteoarthritis in Japanese Patients

Nagamine, Satomi; Sonohata, Motoki; Kitajima, Masaru; Kawano, Synsuke; Ogawa, Kenji; Mawatari, Masaaki; Hotokebuchi, Takao
January 2011
Open Orthopaedics Journal;2011, Vol. 5, p134
Academic Journal
Purpose: There is an association between winter birth and developmental dysplasia of the hip, formerly termed congenital dislocation of the hip. The purpose of this study was to clarify the relationship between the month and season of birth and hip osteoarthritis in Japanese patients who had undergone total hip arthroplasty or transpositional osteotomy of the acetabulum. Methods: One thousand eight hundred and 52 female patients that presented for the surgical treatment of hip osteoarthritis between 1999 and 2005 were included in this study. Female out-patients who were seen at the initial visit during same period were used as controls to correct the bias of the month of birth. Results: There was a significant deviation of the observed number of births from the expected values calculated on a monthly basis (p<0.001). A comparison by seasons (periods of 3 months) revealed more births than expected in winter (p<0.001). The risk of hip osteoarthritis was significantly associated with the month of birth. Namely, it was highest for births in January (p<0.001). Conclusions: These data clearly revealed that the prevalence of hip osteoarthritis was significantly higher in those patients born in winter. The seasonal trend in hip osteoarthritis might be due to the winter prevalence of congenital dislocation of the hip in childhood.


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