Table 1.
Demographic and clinical characteristics of study patients
| Characteristic | Aseptic loosening (n = 174) | PJI (n = 24) | P a |
|---|---|---|---|
| Age (year)-mean (SD) | 69.5 (12.0) | 68.2 (14.1) | 0.61 |
| Gender- no. (%) | |||
| Male | 72 (41.4) | 14 (58.3) | 0.13 |
| Body mass index-mean (SD) | 30.8 (4.8) | 30.6 (6.1) | 0.84 |
| Location | |||
| Hip | 118(67.8) | 23(95.8) | 0.003 |
| Knee | 56 (32.2) | 1(4.2) | |
| Surgical procedure-no. (%)a | |||
| Partial Revision | 99 (56.9) | 19 (79.1) | 0.045 |
| Total Revision (One-stage exchange) | 73 (42.0) | 4 (16.7) | |
| Two-stage revision | 1 (0.6) | 0 | |
| Girdlestone | 1 (0.6) | 1(4.2) | |
| Underlying joint disorder-no (%) | |||
| Osteoarthritis | 6 (3.4) | 0 | 1.00 |
| Osteoarthrosis | 14 (8.0) | 4 (16.7) | 0.24 |
| Osteoporosis | 19 (10.9) | 4 (16.7) | 0.49 |
| Rheumatoid arthritis | 7 (4.0) | 0 | 1.00 |
| Acute fracture/trauma | 9 (5.2) | 1(4.2) | 1.00 |
| Malignancy | 3 (1.7) | 0 | 1.00 |
| Associated conditions- no. (%) | |||
| Diabetes mellitus | 25 (14.4) | 5 (20.8) | 0.38 |
| Immunosuppressive therapy | 6 (3.4) | 0 | 1.00 |
| Systemic steroid therapy | 6 (3.4) | 0 | 1.00 |
| Prior revision arthroplasty | 34 (19.5) | 8 (33.3) | 0.18 |
| Time between last implantation and removal of implant-no. (%) | |||
| ≤30 days | 1 (0.6) | 1 (4.2) | 0.12 |
| 31– 365 days | 15 (8.6) | 5 (20.8) | |
| 366 days-5 years | 51 (29.3) | 6 (25.0) | |
| 6-10 years | 32 (18.4) | 5 (20.8) | |
| 11-15 years | 31 (17.8) | 5 (20.8) | |
| >15 years | 44 (25.3) | 2 (8.3) | |
| Blood units after surgery-no. (%) | 32 (18.4) | 8 (33.3) | 0.11 |
| Length of surgery (minutes)- | 152.6 (70.7) | 173.8 (93.9) | 0.20392 |
| Mean (SD) | 393 |
PJI Prosthetic joint infection; SD Standard Deviation
aTwo-tailed Chi-squared or Fisher exact test for categorical variables or t-test for continuous variables