Table 2.
Characteristics of patients with surgical site infections following total hip or knee arthroplasty, 2013–2020
| Characteristic | Overall Cohort (n = 235) | Superficial SSIs (n = 77) | Deep SSIs (n = 57) | Organ space SSIs (n = 101) | p-value |
|---|---|---|---|---|---|
| Age (years), median (IQR) | 66 (59–72) | 64 (58–75) | 67 (60–71) | 65 (59–72) | 0.879† |
| Male | 129 (54.89) | 34 (44.16) | 37 (64.91) | 58 (57.43) | 0.046‡ |
| Charlson comorbidity index | 0.244‡ | ||||
| 0 | 195 (82.98) | 65 (84.42) | 48 (84.21) | 82 (81.19) | |
| 1 | 27 (11.49) | 11 (14.29) | 6 (10.53) | 10 (9.90) | |
| > 2 | 13 (5.53) | 1 (1.30) | 3 (5.26) | 9 (8.91) | |
| Procedure type | 0.021‡ | ||||
| Knee implantation | 138 (58.72) | 54 (70.13) | 34 (59.65) | 50 (49.50) | |
| Hip implantation | 97 (41.28) | 23 (29.87) | 23 (40.35) | 51 (50.50) | |
| Procedure lateral | 0.595‡ | ||||
| Left | 118 (50.21) | 37 (48.05) | 32 (56.14) | 49 (48.51) | |
| Right | 111 (47.23) | 37 (48.05) | 25 (43.86) | 49 (48.51) | |
| Bilateral | 6 (2.55) | 3 (3.90) | 0 | 3 (2.97) | |
| Blood culture type | < .0001‡ | ||||
| Superficial wound swab | 22 (11.58) | 19 (50.00) | 2 (3.92) | 1 (0.99) | |
| Deep wound | 39 (20.53) | 2 (5.26) | 22 (43.14) | 15 (14.85) | |
| Tissue | 82 (43.16) | 6 (15.79) | 17 (33.33) | 59 (58.42) | |
| Fluid aspirate | 35 (18.42) | 10 (26.32) | 8 (15.69) | 17 (16.83) | |
| Other | 12 (6.32) | 1 (2.63) | 2 (3.92) | 9 (8.91) | |
| Blood culture result | < .0001‡ | ||||
| Positive | 172 (73.19) | 23 (29.87) | 50 (87.72) | 99 (98.02) | |
| Negative | 18 (7.66) | 15 (19.48) | 1 (1.75) | 2 (1.98) | |
| NA | 45 (19.15) | 39 (50.65) | 6 (10.53) | 0 | |
| Days from admission to procedure | 0 | 0 | 0 | 0 | – |
| Days from procedure to discharge | 3 (2,5) | 3 (3,4) | 3 (2,5) | 3 (2,5) | 0.928† |
| Length of hospital stay, median, days | 3 (2,5) | 3 (3,4) | 3 (2,5) | 3 (2,5) | 0.940† |
| Discharge disposition | 0.138‡ | ||||
| Home | 221 (94.04) | 72 (93.51) | 51 (89.47) | 98 (97.03) | |
| Transfer | 10 (4.26) | 4 (5.19) | 3 (5.26) | 3 (2.97) | |
| Death/long term care | 0 | 0 | 0 | 0 | |
| Re-admission | 201 (85.53) | 45 (58.44) | 57 (100.00) | 99 (98.02) | < .0001‡ |
IQR interquartile range, SSIs surgical site infections
†Wilcoxon rank-sum test;
‡Chi-square test