TABLE 2.

Characteristics of 70 cases with a bone and joint infection (≥2 positive P. acnes samples) and 47 cases with no infection (1 positive P. acnes sample)

Parameter	Infection (n = 70)	No infection (n = 47)	P
Patient characteristic
Female sex (no. [%])	21 (30)	15 (32)	0.84
Age (median [range]) (yr)	58 (21–81)	58 (16–86)	0.49
Sample site (no. [%])
Shoulder	51 (72.9)	26 (55.3)	0.07
Hip	13 (18.6)	13 (27.7)	0.27
Spine	4 (5.7)	1 (2.1)	0.65
Knee	1 (1.4)	5 (10.6)	0.04
Other	1 (1.4)	2 (4.3)	0.56
Presence of (no. [%])
Any foreign body	62 (88.6)	39 (83)	0.42
Prosthesis	35 (50)	27 (57.4)	0.46
Intraoperative presentation
Normal	7 (10)	6 (12.8)	0.77
Pus	9 (12.9)	2 (4.3)	0.20
Inflammation	41 (58.6)	26 (55.3)	0.85
Wear of the implant	1 (1.4)	2 (4.3)	0.56
Adhesion	10 (14.3)	7 (14.9)	1
No data available	2 (2.8)	4 (8.5)	0.22