Table 3.

Breakdown of failure rate according to various factors

		Crude failure
Factor	n	Failed	rate	p-value
All	145	36	25
Sex
Male	83	19	23
Female	62	17	27	0.5
Diagnosisa
OA	123	28	23
Inflammatory arthritis	16	4	25	0.8b
Other	6	4	67	0.03b
Type of prosthesis
Standard TKA	137	31	23
Revision modell	8	5	63	0.02b
Type of infection
Hematogenous	12	3	25
Other	133	33	25	1.0b
Pathogenc
S. aureus	53	15	28
CNS	33	7	21	0.5
Polymicrobial	30	9	30	0.9
Negative culture	10	0	0	0.1b
Use of rifampind
Yes	69	13	19
No	17	9	59	0.01b
Timing
Signs of infection ≤ 3 weekse	126	29	23
Signs of infection > 3 weeks	16	6	38	0.2b
Time from TKA ≤ 30 daysf	95	21	22
Time from TKA > 30 days	38	12	32	0.3

^aComparison with OA.

^bFisher’s exact test.

^cThe most common findings presented and comparison made with S. aureus.

^dIn monomicrobial staphylococcal infections

^eInformation missing in 3 cases.

^fHematogenous infections excluded.