Total hip arthroplasty in Denmark: incidence of primary operations and revisions during 1996-2002 and estimated future demands. Pedersen, A. B., Johnsen, S. P., Overgaard, S., Søballe, K., Sørensen, H. T., & Lucht, U. Acta Orthopaedica, 76(2):182–189, April, 2005.
abstract   bibtex   
BACKGROUND: The annual number of total hip arthroplasties (THA) has increased in Denmark over the past 15 years. There is, however, limited detailed data available on the incidence of THAs. METHODS: We calculated the incidence rates (IR) of primary THA and revision in Denmark between 1996 and 2002 and estimated the demands for primary THA in Denmark until 2020. We used data from the Danish Hip Arthroplasty Registry, a nationwide and population-based clinical database, to identify patients who had undergone primary THA (n = 37,144) or revision arthroplasties (n = 6446). Age and sex-specific data on the Danish population were obtained from the StatBank Denmark. All IRs were standardized according to two standards, i.e. the Danish population in 1996 and the European standard population (18 age groups). The future demands for primary THA were estimated using the age and sex-specific incidence of primary THA for 2002 as a reference, and taking into account the expected changes in the age distribution of the population and the trend in IRs seen in Denmark between 1996 and 2002. RESULTS: The annual overall standardized IRs of primary THAs and revisions increased from 101 (95% confidence interval (CI): 97.6-104) to 134 (CI: 131-138) and from 19.2 (CI: 17.9-20.5) to 21.1 (CI: 19.8-22.4) per 100,000 inhabitants from 1996 to 2002, respectively (IRs adjusted to the Danish population in 1996). The IRs of primary THAs and revisions increased by 30% and 10% during this period. The relative increase in IRs of primary THAs was found to be similar in both women and men. The increase was higher among patients aged 50-59 years, however. Furthermore, a decrease in IRs was seen in patients who underwent primary THA due to rheumatoid arthritis. IRs of primary THAs have been estimated to increase by 22% in 2020 compared with 2002, based only on the expected changes in the age distribution of the population. However, assuming that the annual age and sex-independent increase in the IRs seen in the period 1996-2002 will continue, the IR of primary THA is estimated to increase by as much as 210% in 2020. INTERPRETATION: The overall annual standardized IRs of primary THAs and revisions in Denmark increased during the period from 1996 to 2002. Moreover, the demands for THA procedures in the coming decades may exceed the current capacity due to the ageing population and a continued age and sex-independent increase in surgical activity.
@article{pedersen_total_2005,
	title = {Total hip arthroplasty in {Denmark}: incidence of primary operations and revisions during 1996-2002 and estimated future demands},
	volume = {76},
	issn = {1745-3674},
	shorttitle = {Total hip arthroplasty in {Denmark}},
	abstract = {BACKGROUND: The annual number of total hip arthroplasties (THA) has increased in Denmark over the past 15 years. There is, however, limited detailed data available on the incidence of THAs.
METHODS: We calculated the incidence rates (IR) of primary THA and revision in Denmark between 1996 and 2002 and estimated the demands for primary THA in Denmark until 2020. We used data from the Danish Hip Arthroplasty Registry, a nationwide and population-based clinical database, to identify patients who had undergone primary THA (n = 37,144) or revision arthroplasties (n = 6446). Age and sex-specific data on the Danish population were obtained from the StatBank Denmark. All IRs were standardized according to two standards, i.e. the Danish population in 1996 and the European standard population (18 age groups). The future demands for primary THA were estimated using the age and sex-specific incidence of primary THA for 2002 as a reference, and taking into account the expected changes in the age distribution of the population and the trend in IRs seen in Denmark between 1996 and 2002.
RESULTS: The annual overall standardized IRs of primary THAs and revisions increased from 101 (95\% confidence interval (CI): 97.6-104) to 134 (CI: 131-138) and from 19.2 (CI: 17.9-20.5) to 21.1 (CI: 19.8-22.4) per 100,000 inhabitants from 1996 to 2002, respectively (IRs adjusted to the Danish population in 1996). The IRs of primary THAs and revisions increased by 30\% and 10\% during this period. The relative increase in IRs of primary THAs was found to be similar in both women and men. The increase was higher among patients aged 50-59 years, however. Furthermore, a decrease in IRs was seen in patients who underwent primary THA due to rheumatoid arthritis. IRs of primary THAs have been estimated to increase by 22\% in 2020 compared with 2002, based only on the expected changes in the age distribution of the population. However, assuming that the annual age and sex-independent increase in the IRs seen in the period 1996-2002 will continue, the IR of primary THA is estimated to increase by as much as 210\% in 2020.
INTERPRETATION: The overall annual standardized IRs of primary THAs and revisions in Denmark increased during the period from 1996 to 2002. Moreover, the demands for THA procedures in the coming decades may exceed the current capacity due to the ageing population and a continued age and sex-independent increase in surgical activity.},
	language = {ENG},
	number = {2},
	journal = {Acta Orthopaedica},
	author = {Pedersen, Alma B. and Johnsen, Søren P. and Overgaard, Søren and Søballe, Kjeld and Sørensen, Henrik T. and Lucht, Ulf},
	month = apr,
	year = {2005},
	keywords = {Adolescent, Adult, Arthroplasty, Replacement, Hip, Child, Denmark, Female, Humans, Incidence, Male, Middle Aged, Prognosis, Prosthesis Failure, Registries, Reoperation},
	pages = {182--189}
}
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