Iatrogenic NJI in adults in Iceland 2003–2017
| Arthrocentesis | Arthroscopy | Open joint surgery | Total | |
| No of cases | 19 | 58 | 11 | 88 |
| Age (years, median) | 69 | 54 | 63 | 57 |
| Time from procedure to diagnosis (days, median) | 10 | 13 | 52 | 13 |
| Male/female ratio | 1.4 | 2.6 | 2.7 | 2.3 |
| Infected joint | ||||
| Knee | 11/19 (58) | 52/58 (90) | 8/11 (73) | 71/88 (81) |
| Shoulder | 3/19 (16) | 4/58 (7) | 1/11 (9) | 8/88 (9) |
| Other* | 5/19 (26) | 2/58 (3) | 2/11 (18) | 9/88 (10) |
| Synovial culture | ||||
| Staphylococcus aureus | 11/19 (58) | 23/58 (40) | 4/11 (36) | 38/88 (43) |
| CNS | 4/19 (21) | 23/58 (40) | 6/11 (55) | 33/88 (38) |
| Streptococci† | 3/19 (16) | 5/58 (9) | 1/11 (9) | 9/88 (10) |
| Other‡‡ | 1/19 (5) | 7/58 (12) | 0 | 8/88 (9) |
Data are no/no (%). Median values for age and time from procedure to diagnosis are shown.
*Acromioclavicular, ankle, hip, proximal interphalangeal and wrist joint.
†Streptococcus, viridans group: 3, Streptococci group C or G: 4, Streptococcus mitis: 1, Streptococcus pneumoniae: 1.
‡Enterobacter cloacae, gram positive rods, Klebsiella oxytoca, Lactococcus cremoris, Micrococcus species.
CNS, coagulase-negative staphylococci; NJI, native joint infection.