A1 Refereed original research article in a scientific journal
Different incidences of knee arthroplasty in the Nordic countries A population-based study from the Nordic Arthroplasty Register Association
Authors: Niemeläinen Mika J, Mäkelä Keijo T, Robertsson Otto, W-Dahl Annette, Furnes Ove, Fenstad Anne M, Pedersen Alma B, Schrøder Henrik M, Huhtala Heini, Eskelinen Antti
Publisher: TAYLOR & FRANCIS LTD
Publishing place: London
Publication year: 2017
Journal:: Acta Orthopaedica
Journal name in source: ACTA ORTHOPAEDICA
Journal acronym: ACTA ORTHOP
Volume: 88
Issue: 2
First page : 173
Last page: 178
Number of pages: 6
ISSN: 1745-3674
eISSN: 1745-3674
DOI: https://doi.org/10.1080/17453674.2016.1275200
Web address : http://www.tandfonline.com/action/showCopyRight?scroll=top&doi=10.1080/17453674.2016.1275200
Self-archived copy’s web address: https://tampub.uta.fi/handle/10024/100925
Background and purpose - The annual number of total knee arthroplasties (TKAs) has increased worldwide in recent years. To make projections regarding future needs for primaries and revisions, additional knowledge is important. We analyzed and compared the incidences among 4 Nordic countriesPatients and methods - Using Nordic Arthroplasty Register Association (NARA) data from 4 countries, we analyzed differences between age and sex groups. We included patients over 30 years of age who were operated with TKA or unicompartmental knee arthroplasty (UKA) during the period 1997-2012. The negative binomial regression model was used to analyze changes in general trends and in sex and age groups.Results - The average annual increase in the incidence of TKA was statistically significant in all countries. The incidence of TKA was higher in women than in men in all 4 countries. It was highest in Finland in patients aged 65 years or more. At the end of the study period in 2012, Finland's total incidence was double that of Norway, 1.3 times that of Sweden and 1.4 times that of Denmark. The incidence was lowest in the youngest age groups (< 65 years) in all 4 countries. The proportional increase in incidence was highest in patients who were younger than 65 years.Interpretation - The incidence of knee arthroplasty steadily increased in the 4 countries over the study period. The differences between the countries were considerable, with the highest incidence in Finland. Patients aged 65 years or more contributed to most of the total incidence of knee arthroplasty.
