Table 3

Sources of infection

		Total		Children				Adults
		Total		All children	Previously healthy			Concomitant disease	All adults	Previously healthy	Immunocompromised	Joint disorder^3-151	Joint disorder and immunocompromised ^3-151
Haematogenous	126	36	29	7		90	16	32	23 (15)	19 (10)
Skin	42	4	4			38	5	15	10 (7)	8 (3)
Upper airways	4	12	10	2		2	1
Lower airways	16					6	2	4	1 (1)
Urinary tract	7					7		1	1	5 (3)
Non-sterile intervention distant from infected joint:
Skin	5					5		5
Urological	2					2			2 (1)
Unknown	50	20	15	5		30	8	7	9 (6)	6 (4)
Direct	62	2	2			60	7	6	40 (27)	7 (6)
Joint surgery^3-150	40					40			33 (25)	7 (6)
Intra-articular injection	3					3			3 (1)
Trauma	13	2	2			11	7	1	3 (1)
Infection of overlying skin	4					4		4
Chronic osteomyelitis	2					2		1	1

↵3-150 Included are two therapeutic and one diagnostic arthroscopy.
↵3-151 Numbers in parentheses refer to cases with infections around prosthetic or osteosynthetic material.