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Table 3 Incidence of primary TKA during the study period

From: Decrease in the incidence of total hip arthroplasties in patients with rheumatoid arthritis - results from a well defined population in south Sweden

Year

Mean age*

Primary knee TJR (n)

Person-years (pyr)

Incidence/1000 pyr

95% CI

1998

60.6

9

1,369

6.57

3.01 to 12.48

1999

61.0

5

1,395

3.58

1.16 to 8.36

2000

61.5

6

1,423

4.22

1.55 to 9.18

2001

61.6

7

1,439

4.86

1.96 to 10.02

2002

61.6

4

1,442

2.77

0.76 to 7.10

2003

61.7

14

1,463

9.57

5.23 to 16.06

2004

61.7

10

1,480

6.76

3.24 to 12.43

2005

61.6

12

1,491

8.05

4.16 to 14.06

2006

62.2

6

1,467

4.09

1.50 to 8.90

2007

62.9

9

1,062

8.47

3.88 to 16.09

  1. TKA, total knee arthroplasty. * Mean age for all observed patients in the cohort at the start of each calendar year
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Arthritis Research & Therapy

ISSN: 1478-6362

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