Table 1.
Clinical characteristics on admission among children and adults with NJI in Iceland, 2003–2017
| Children <2 years | 2–18 years | Total | Adults 18–65 years | >65 years | Total | P value | |
| No of cases | 19 | 21 | 40 | 149 | 110 | 259 | |
| Time to presentation (days) | 2 | 3 | 3 | 4 | 2 | 3 | |
| Joint pain | 16/19 (84) | 21/21 (100) | 37/40 (93) | 146/149 (98) | 108/110 (98) | 254/259 (98) | 0.08 |
| Swollen joint* | 14/18 (78) | 20/21 (95) | 31/39 (79) | 144/148 (97) | 101/107 (94) | 245/255 (96) | <0.001 |
| DROM† | 19/19 (100) | 20/20 (100) | 39/39 (100) | 141/142 (99) | 104/107 (97) | 245/249 (98) | 1 |
| Joint redness¶ | 8/15 (53) | 7/13 (54) | 15/28 (54) | 43/112 (38) | 47/90 (52) | 90/202 (45) | 0.4 |
| Warm joint‡ | 8/12 (67) | 11/13 (85) | 19/25 (76) | 89/115 (77) | 54/72 (75) | 143/187 (76.5) | 1 |
| Infected joint: | |||||||
| Knee | 4/19 (21) | 9/21 (43) | 13/40 (33) | 95/149 (64) | 53/110 (48) | 148/259 (57) | 0.006 |
| Shoulder | 3/19 (16) | 0 | 3/40 (7.5) | 7/149 (5) | 18/110 (16) | 25/259 (10) | 1 |
| Elbow | 2/19 (11) | 7/21 (33) | 9/40 (23) | 1/149 (1) | 0 | 1/259 (0.5) | <0.001 |
| Hip | 1/19 (5) | 3/21 (14) | 4/40 (10) | 12/149 (8) | 8/110 (7) | 20/259 (8) | 0.5 |
| Ankle | 6/19 (32) | 2/21 (9.5) | 8/40 (20) | 11/149 (7) | 7/110 (6) | 18/259 (7) | 0.01 |
| Wrist | 1/19 (5) | 0 | 1/40 (2.5) | 3/149 (2) | 14/110 (13) | 17/259 (6.5) | 0.5 |
| Hands and feet | 0 | 0 | 0 | 5/149 (3) | 6/110 (5) | 11/259 (4) | – |
| Other joints§ | 2/19 (11) | 0 | 2/40 (5) | 15/149 (10) | 4/110 (4) | 19/259 (7) | 1 |
| Polyarticular infection | 0 | 0 | 0 | 7/149 (5) | 12/110 (11) | 19/259 (7) | – |
| Iatrogenic infection | 0 | 3/21 (14) | 3/40 (7.5) | 67/149 (45) | 21/110 (19) | 88/259 (34) | <0.001 |
Data are no/no (%).
P value, children vs adults.
P values <0.05 are shown in bold.
*Information on joint swelling found in: 18/19 cases <2 years, 21/21 cases 2–18 years, 148/149 cases 18–65 years and 107/110 >65 years.
†DROM: Information found in: 19/19 cases <2 years, 20/21 cases 2–18 years, 142/149 cases 18–65 years and 107/110 >65 years.
‡Information on temperature change over joint found in: 12/19 cases <2 years, 13/21 cases 2–18 years, 115/149 cases 18–65 years and 72/110 >65 years.
§Adults: 8 sternoclavicular, 7 acromioclavicular, 2 sacroiliac, 2 vertebral facet joint infections. Children: 2 sacroiliac infections.
¶Information on joint redness found in: 15/19 cases <2 years, 13/21 cases 2–18 years, 112/149 cases 18–65 years and 90/110 >65 years.
DROM, decreased range of motion; NJI, native joint infection.