Table 3 Comparison of patients with post-operative Staphylococcus aureus infection and uninfected patients following orthopedic surgical procedures*
From: Staphylococcus aureus infections following knee and hip prosthesis insertion procedures
Prosthetic Knee Insertion | Prosthetic Hip Insertion | |||
|---|---|---|---|---|
S. aureus infection | Uninfected | S. aureus infection | Uninfected | |
(N=48) | (N=8,340) | (N=44) | (N=5,168) | |
NHSN risk index | ||||
0 | 5 (10) | 2,395 (29) | 1 ( 2) | 1,170 (23) |
1 | 19 (40) | 4,268 (51) | 23 (52) | 2,916 (56) |
≥2 | 22 (46) | 1,311 (16) | 18 (41) | 947 (18) |
Missing | 2 ( 4) | 366 ( 4) | 2 ( 5) | 135 ( 3) |
p-value | <0.0001 | 0.0001 | ||
ASA score | ||||
1: Healthy | 1 ( 2) | 599 ( 7) | 0 ( 0) | 131 ( 2) |
2: Mild systemic disease | 12 (25) | 3,595 (43) | 8 (18) | 2,133 (41) |
3: Severe systemic disease | 28 (58) | 3,790 (45) | 28 (64) | 2,359 (46) |
4: Incapacitating disease | 7 (15) | 311 ( 4) | 7 (16) | 506 (10) |
5: Dying | 0 ( 0) | 0 ( 0) | 0 ( 0) | 1 (<1) |
6: Emergency care | 0 ( 0) | 0 ( 0) | 0 ( 0) | 0 ( 0) |
Missing | 0 ( 0) | 45 (<1) | 1 ( 2) | 38 ( 1) |
p -value | 0.0002 | 0.024 | ||
Wound class | ||||
Clean | 47 (98) | 8,042 (96) | 43 (98) | 4,927 (95) |
Clean - contaminated | 1 ( 2) | 298 ( 4) | 1 ( 2) | 241 ( 5) |
p -value | 0.58 | 0.45 | ||
Procedure duration | ||||
Mean (SD), minutes | 158.2 (108.1) | 124.7 (110.0) | 169.3 (112.8) | 125.5 (109.6) |
p -value | 0.036 | 0.0082 | ||
Age category (years) | ||||
18-29 | 1 ( 2) | 393 ( 5) | 1 ( 2) | 77 ( 1) |
30-39 | 2 ( 4) | 418 ( 5) | 1 ( 2) | 203 ( 4) |
40-49 | 8 (17) | 793 ( 9) | 4 ( 9) | 598 (12) |
50-59 | 12 (25) | 1,752 (21) | 7 (16) | 883 (17) |
60-69 | 9 (19) | 2,318 (28) | 8 (18) | 1,060 (20) |
70-79 | 11 (23) | 2,039 (24) | 6 (14) | 1,250 (24) |
80+ | 5 (10) | 627 ( 7) | 17 (39) | 1,097 (21) |
p -value | 0.46 | 0.17 | ||