Children hospitalised for a first episode of arthritis in 2008–2009: joint involvement at first hospitalisation
| Number of affected joints | Affected joint | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Monoarthritis | Oligoar thritis* | Polyar thritis† | Knee | Hip | Ankle | Others‡ | ||||||||||
| Number of patients | Per cent | n | Per cent | n | Per cent | n | Per cent | n | Per cent | n | Per cent | n | Per cent | n | Per cent | |
| Total | 173 | 100 | 151 | 87.3 | 18 | 10.4 | 4 | 2.3 | 73 | 42.2 | 56 | 32.4 | 17 | 9.8 | 27 | 15.6 |
| Septic arthritis | 75 | 43.3 | 73 | 97.3 | 2 | 2.7 | 0 | 0 | 38 | 50.7 | 19 | 25.3 | 8 | 10.7 | 10 | 13.3 |
| JIA | 14 | 8.1 | 8 | 57.1 | 4 | 28.6 | 2 | 14.3 | 7 | 50.0 | 1 | 7.1 | 1 | 7.1 | 5 | 35.8 |
| No definitive diagnosis§ | 70 | 40.4 | 62 | 88.6 | 8 | 11.4 | 0 | 0 | 22 | 31.4 | 33 | 47.2 | 8 | 11.4 | 7 | 10.0 |
| Kawasaki disease | 3 | 1.7 | 1 | 33.3 | 2 | 66.7 | 0 | 0 | 1 | 33.4 | 1 | 33.3 | 0 | 0 | 1 | 33.3 |
| Haemarthrosis | 3 | 1.7 | 3 | 100 | 0 | 0 | 0 | 0 | 3 | 100 | 0 | 0 | 0 | 0 | 0 | 0 |
| Malignant disease | 2 | 1.2 | 0 | 0 | 2 | 100 | 0 | 0 | 0 | 0 | 1 | 50.0 | 0 | 0 | 1 | 50.0 |
| Others¶ | 6 | 3.5 | 4 | 66.7 | 0 | 0 | 2 | 33.3 | 2 | 33.4 | 2 | 33.3 | 0 | 0 | 2 | 33.3 |
| p Value | <0.01 | <0.01 | ||||||||||||||
*Oligoarthritis indicates between two and four joints affected.
†Polyarthritis indicates more than five joints affected.
‡Other joints: finger or foot joints (six cases), shoulder (four cases), elbow (three cases), wrist (one case), association of many of the above-mentioned joints (13 cases).
§Arthritis without any definitive diagnosis indicates arthritis with no established association with infection and that did not fulfil the classification criteria for JIA or other well-established diagnoses (haemarthrosis, Kawasaki disease, malignant disease, Gaucher disease, systemic lupus erythematosus, villo-nodular synovitis, dermatomyositis and chronic recurrent multifocal osteitis).
¶Others: one Gaucher disease, one systemic lupus erythematosus, two villo-nodular synovitis, one dermatomyositis and one chronic recurrent multifocal osteitis.
JIA, juvenile idiopathic arthritis.