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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)