Background Elderly people over 65 year-old have increased year by year in many countries1. Because their rate was from 19.5% at 2004 to 26.8% at 2015 in Japan and 30.8% at 2015 in our super-aging area, the numbers of total joint arthroplasties have increased too2. In fact, the numbers of total hip arthroplasty predicted increasing from six hundred fifty-six thousand cases at 2010 to one million three hundred seventy-six thousand cases at 2020 in USA3. The rate of total joint arthroplasty, including primary total hip arthroplasty, may reflect trends in management and health outcomes of elderly people with osteoarthritis (OA) in our super-aging area of Japan1,4.
Objectives The aim of this study was to analyze the trend of primary total hip arthroplasties for the patients with OA in our institutes in the last twelve years.
Methods We surveyed the number and rate of orthopaedic surgeries and primary total hip arthroplasties in our two institutes from 2004 to 2015.
Results We had 19,862 cases of orthopaedic surgeries, including 3,782 primary total hip arthroplasties in the last twelve years. They have increased year by year (r=0.92, p<0.05, Fig. 1). Mean age was 64.5 old-year (62.4–66.8) in last twelve years, had become older year by year (r=0.78, p<0.05), 62.4 old-year at 2004 vs 66.8 old-year at 2015. Mean rate of female was 87% (85–91) in last twelve years, had gradually decreased year by year (r= -0.68, p<0.05), 91% at 2004 vs 85% at 2015.
Conclusions The rate of total joint arthroplasties including primary total hip arthroplasty increased year by year, and related to total numbers of orthopaedic surgeries in our super-aging area of Japan. Mean age at receiving primary total hip arthroplasty was older annually but mean rate of women had gradually decreased year by year. Although majority of OA hip consist of female which have secondary dysplastic acetabulum in our country2, it might increase gradually the patients of man with OA hip in super-aging time in Japan.
National Institute of Population and Social Security Research. Japanese Mortality Database, 2014. http://www.ipss.go.jp/.
Jingushi S, et al. J Orthop Sci. 15:626–31, 2010.
Kurtz SM, et al. J Bone Joint Surg Am. 96: 624–30, 2014.
Yamagata prefecture, Health and longevity Promotion Section. Rate of elderly people in Yamagata prefecture, 2014. http://www.pref.yamagata.jp/ou/kikakushinko/020052/tokei/jinkel.html.
Disclosure of Interest None declared
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