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During the 10-year period 1981-1990, 1,199 patients in the county of South Jutland, Denmark, had 1,477 primary total hip arthroplasties (THA) performed because of primary arthrosis (OA). The patients were followed until the end of 1994, with a mean follow-up of 5.6 (0-14) years. Bilateral operations were performed on 356 patients, whereas 248 patients had died with only 1 THA. The cumulated risk of replacement of the contralateral hip was approximately 0.15 1 year after replacement of the first hip, 0.20 after 2 years, 0.29 after 5 years and 0.47 after 10 years, respectively. During the follow-up period, the demand for a THA of the contralateral hip continued to be approximately 15 times higher than in the general population.

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No abstract

During the 10-year period 1981-90, 1752 primary total hip arthroplasties were performed in the County of South Jutland, Denmark. The annual number increased to a steady state during 1988-90. In this period, the incidence was highest in the age group 70-79 years for both women and men, with 485 and 410 arthroplasties per 100,000 inhabitants, respectively; the overall incidence was 82 per 100,000 inhabitants. During the next 30 years, the demand for primary hip arthroplasties in Denmark is expected to increase because of demographic changes.