Abstract：
BACKGROUND: The number of total hip arthroplasty (THA) is increasing globally, including Japan. The Japanese Orthopaedic Association has been conducting a registry of joint replacement surgery, but there may be a gap between the reported numbers of THA in the registry and the actual number. This study aimed to investigate the exact number of THA and assess the trends in Japan using the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB).
METHODS: We downloaded data from 2014 to 2019 from the NDB Open Data. Data on primary THA were extracted, and we calculated the annual number and number for each 10-year age group and sex. We also compared the number and trends between elderly and non-elderly groups.
RESULTS: During the study period, number of THAs increased by approximately 20,000, showing a continuous upward trend. The highest number of THAs were performed on patients in their 60s, except for the years 2014 and 2019. Comparison of the numbers in 2014 and 2019 by age group showed an increase in the number in patients in their 90s (by 2.05 times). There were significantly a greater number of elderly patients (P < 0.001). The number of THAs performed was higher in women than in men (P < 0.001).
CONCLUSIONS: The number of THAs in Japan increased substantially from 2014 to 2019, despite a decrease in population. Significantly higher number of THAs were performed on elderly patients in Japan, which might be due to an aging society. The NDB data is highly valuable for epidemiological research in Japan, as it might enable the early detection of issues occurring during THA, facilitating their prompt integration into daily clinical practice.
METHODS: We downloaded data from 2014 to 2019 from the NDB Open Data. Data on primary THA were extracted, and we calculated the annual number and number for each 10-year age group and sex. We also compared the number and trends between elderly and non-elderly groups.
RESULTS: During the study period, number of THAs increased by approximately 20,000, showing a continuous upward trend. The highest number of THAs were performed on patients in their 60s, except for the years 2014 and 2019. Comparison of the numbers in 2014 and 2019 by age group showed an increase in the number in patients in their 90s (by 2.05 times). There were significantly a greater number of elderly patients (P < 0.001). The number of THAs performed was higher in women than in men (P < 0.001).
CONCLUSIONS: The number of THAs in Japan increased substantially from 2014 to 2019, despite a decrease in population. Significantly higher number of THAs were performed on elderly patients in Japan, which might be due to an aging society. The NDB data is highly valuable for epidemiological research in Japan, as it might enable the early detection of issues occurring during THA, facilitating their prompt integration into daily clinical practice.
摘要：
背景：全球全髋关节置换术（THA）的数量正在增加，包括日本。日本骨科协会一直在进行关节置换手术的登记,但是注册表中报告的THA数量与实际数量之间可能存在差距。这项研究旨在调查THA的确切数量，并使用日本健康保险索赔和特定健康检查国家数据库（NDB）评估日本的趋势。
方法：我们从NDB开放数据中下载了2014年至2019年的数据。提取了主要THA的数据，我们计算了每个10岁年龄组和性别的年度数量和数量。我们还比较了老年人和非老年人群体的数量和趋势。
结果：在研究期间，THA的数量增加了约20,000，呈持续上升趋势。在60多岁的患者中进行的THA数量最多，除了2014年和2019年。2014年和2019年按年龄组划分的数字比较显示，90多岁的患者人数增加了（2.05倍）。老年患者明显增多(P<0.001)。女性的THA数量高于男性（P<0.001）。
结论：尽管人口减少，但日本的THA数量从2014年到2019年大幅增加。在日本，对老年患者进行的THA数量显着增加，这可能是由于老龄化社会。NDB数据对日本的流行病学研究非常有价值，因为它可能能够早期检测THA期间发生的问题，促进他们迅速融入日常临床实践。
方法：我们从NDB开放数据中下载了2014年至2019年的数据。提取了主要THA的数据，我们计算了每个10岁年龄组和性别的年度数量和数量。我们还比较了老年人和非老年人群体的数量和趋势。
结果：在研究期间，THA的数量增加了约20,000，呈持续上升趋势。在60多岁的患者中进行的THA数量最多，除了2014年和2019年。2014年和2019年按年龄组划分的数字比较显示，90多岁的患者人数增加了（2.05倍）。老年患者明显增多(P<0.001)。女性的THA数量高于男性（P<0.001）。
结论：尽管人口减少，但日本的THA数量从2014年到2019年大幅增加。在日本，对老年患者进行的THA数量显着增加，这可能是由于老龄化社会。NDB数据对日本的流行病学研究非常有价值，因为它可能能够早期检测THA期间发生的问题，促进他们迅速融入日常临床实践。
