Table 4 Revisions causes with 10 years follow up. Hazard Ratios with confidence intervals for different hospital volumes, adjusted for sex, age category, year of surgery and nation
Annual hospital volume group | Number of procedures | Number of revisions | Revision causes with adjusted Hazard Ratios (95% confidence interval) | |||||
|---|---|---|---|---|---|---|---|---|
Infection | Loosening/Wear | Instability/Dislocation | Unexplained pain | Other reasons | Unknown reasons | |||
1519 | n = 57 | n = 545 | n = 104 | n = 273 | n = 498 | n = 42 | ||
≤11 | 3528 | 465 | 1.0 (ref) | 1.0 (ref) | 1.0 (ref) | 1.0 (ref) | 1.0 (ref) | 1.0 (ref) |
12-23 | 3759 | 420 | 1.02 (0.49-2.16) | 1.04 (0.83-1.29) | 1.66 (1.00-2.76) | 0.54 (0.39-0.75) | 0.72 (0.57-0.91) | 1.90 (0.83-4.39) |
24-43 | 3533 | 292 | 0.92 (0.41-2.02) | 0.80 (0.61-1.04) | 1.12 (0.61-2.05) | 0.64 (0.46-0.89) | 0.80 (0.62-1.04) | 1.12 (0.44-2.86) |
≥44 | 3676 | 342 | 1.20 (0.54-2.64) | 0.93 (0.73-1.19) | 1.15 (0.58-2.28) | 0.56 (0.39-0.80) | 0.77 (0.60-0.99) | 0.47 (0.14-1.51) |
Number of revisions in each volume group: | ||||||||
≤11 | 13 | 157 | 23 | 96 | 168 | 8 | ||
12-23 | 15 | 166 | 43 | 60 | 118 | 18 | ||
24-43 | 13 | 93 | 21 | 61 | 93 | 11 | ||
≥44 | 16 | 129 | 17 | 56 | 119 | 5 | ||