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Table 2 causes and time to revision

From: Analysis of Total Knee Arthroplasty revision causes

Failure mechanism

Total [n (%)] n = 402

Time to revisiona (yr)

Primary revision [n (%)]

Re-revision

Early n = 76

Time to revisiona (yr)

Late n = 207

Time to revisiona (yr)

[n (%)]

Time to revisiona (yr)

Infection

146 (36.3)

4.2 ± 4.4 (0.06 - 20.1)

39 (51.3)

1.0 ± 0.6 (0.06 - 2.0)

57 (27.5)

7.3 ± 4.8 (2.1 - 20.1)

50 (44.2)

3.3 ± 3.3 (0.1 - 13.0)

Aseptic loosening

87 (21.6)

6.5 ± 5.4 (0.4 - 21.6)

7 (9.2)

1.6 ± 0.2 (1.4 - 2.0)

49 (23.7)

8.6 ± 5.6 (2.1 - 21.6)

31 (27.7)

4.3 ± 3.8 (0.4 - 17.1)

Periprosthetic fracture

55 (13.7)

8.5 ± 5.4 (0.04 - 24.2)

4 (5.3)

0.5 ± 0.6 (0.04 - 1.4)

39 (18.8)

9.5 ± 5.1 (2.6 - 24.2)

6 (5.4)

7.9 ± 4.9 (3.9 - 17.6)

Instability

27 (6.7)

5.4 ± 4.1 (0.08 - 15.2)

5 (6.6)

1.3 ± 0.2 (1.1 - 1.6)

16 (7.7)

6.9 ± 4.1 (2.2 - 15.2)

6 (5.4)

4.9 ± 3.3 (0.1 - 9.2)

Pain

24 (6.0)

3.6 ± 3.0 (1.1 - 11.1)

6 (7.9)

1.4 ± 0.2 (1.1 - 1.6)

13 (6.3)

5.6 ± 3.1 (2.0 - 11.1)

5 (4.5)

1.9 ± 0.4 (1.4 - 2.2)

Polyethylene wear

21 (5.2)

10.5 ± 5.8 (1.6 - 19.5)

0 (0)

 

17 (8.2)

11.9 ± 5.3 (3.7 - 19.5)

4 (3.6)

4.8 ± 4.2 (1.6 - 10.8)

Restriction of motion, arthrofibrosis

18 (4.5)

2.6 ± 2.3 (0.04 - 9.6)

7 (9.2)

0.9 ± 0.6 (0.04 - 0.9)

8 (3.9)

4.1 ± 2.6 (2.1 - 9.6)

3 (2.7)

2.6 ± 1.9 (0.6 - 4.3)

Extensor mechanism insufficiency

15 (3.7)

2.9 ± 3.6 (0.03 - 11.8)

7 (9.2)

0.7 ± 0.8 (0.03 - 1.8)

6 (2.9)

5.6 ± 4.4 (2.0 - 11.8)

2 (1.8)

2.9 ± 1.9 (1.6 - 4.2)

Mechanically defect

8 (2.0)

5.5 ± 2.8 (1.4 - 9.8)

1 (1.3)

1.4

2 (1.0)

8.5 ± 1.8 (7.2 - 9.8)

5 (4.5)

5.1 ± 2.1 (2.6 - 7.9)

Allergy

1 (0.2)

1.2

0 (0)

 

0 (0)

 

1 (0.9)

1.2

Total

 

5.5 ± 5.0 (0.03 - 24.2)

 

1.0 ± 0.6 (0.03 - 2.0)

 

8.1 ± 5.1 (2.0 - 24.2)

 

3.9 ± 3.5 (0.08 - 17.6)

  1. a values are given as mean ± SD (range)