| Arthrocentesis | Arthroscopy | Open joint surgery | Total | |
| No. of cases | 33 | 18 | 26 | 77 |
| Age (median) | 63 | 47 | 70 | 60.1 |
| Male/female ratio | 2 | 17 | 1 | 2.1 |
| Infected joint: | ||||
| Knee | 64% (21) | 89% (16) | 62% (16) | 69% |
| Shoulder | 12% (4) | 11% (2) | 16% (4) | 13% |
| Hip | 3% (1) | 0 | 16% (4) | 6% |
| Other | 21% (7) | 0 | 8% (2) | 12% |
| Synovial culture: | ||||
| Coagulase-positive Staphylococci | 49% (16) | 22% (4) | 27% (7) | 35% |
| Coagulase-negative Staphylococci | 21% (7) | 28% (5) | 20% (5) | 22% |
| Streptococci | 9% (3) | 11% (2) | 27% (7) | 16% |
| Other | 9% (3) | 17% (3) | 15% (4) | 13% |
| Negative | 12% (4) | 22% (4) | 11% (3) | 14% |
Figures in parentheses are absolute no. of cases.