Table 1

Clinical characteristics on admission among children and adults with NJI in Iceland, 2003–2017

Children <2 years2–18 yearsTotalAdults 18–65 years>65 yearsTotalP value
No of cases192140149110259
Time to presentation (days)233423
Joint pain16/19 (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:
 Knee4/19 (21)9/21 (43)13/40 (33)95/149 (64)53/110 (48)148/259 (57) 0.006
 Shoulder3/19 (16)03/40 (7.5)7/149 (5)18/110 (16)25/259 (10)1
 Elbow2/19 (11)7/21 (33)9/40 (23)1/149 (1)01/259 (0.5) <0.001
 Hip1/19 (5)3/21 (14)4/40 (10)12/149 (8)8/110 (7)20/259 (8)0.5
 Ankle6/19 (32)2/21 (9.5)8/40 (20)11/149 (7)7/110 (6)18/259 (7) 0.01
 Wrist1/19 (5)01/40 (2.5)3/149 (2)14/110 (13)17/259 (6.5)0.5
 Hands and feet0005/149 (3)6/110 (5)11/259 (4)
 Other joints§2/19 (11)02/40 (5)15/149 (10)4/110 (4)19/259 (7)1
 Polyarticular infection0007/149 (5)12/110 (11)19/259 (7)
 Iatrogenic infection03/21 (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.