Observational study of a new modular femoral revision system

Table 2 The risk factors for re-revision

		Hazard Ratio	95%CI	P value
Cause for revision	Aseptic loosening (n = 80)	1.00	(1.00, 1.00)	1.000
	Infection (n = 14)	3.02	(0.01, 1108.00)	0.713
	Fracture (n = 17)	14.22	(1.07, 189.61)	0.045
ASA	1-2 (n = 75)	1.00	(1.00, 1.00)	1.000
	3 (n = 31)	1.33	(0.08, 23.26)	0.846
Gender	Male (n = 55)	1.00	(1.00, 1.00)	1.000
	Female (n = 61)	2.64	(0.26, 26.48)	0.410
Age group	< 73 (n = 64)	1.00	(1.00, 1.00)	1.000
	≥ 73 (n = 52)	0.44	(0.04, 4.50)	0.485
Revision	No revisions (n = 2)	1.00	(1.00,1.00)	1.000
	First revision (n = 86)	11.00	(0.04, 2902.06)	0.399
Bone stock quality	1 + 2 (n = 95)	1.00	(1.00, 1.00)	1.000
	3-5 (n = 20)	2.23	(0.25, 19.51)	0.470
Arcos stem	Other combinations (n = 21)	1.00	(1.00, 1.00)	1.000
	Broach + Slotted (n = 95)	0.11	(0.01, 1.42)	0.091

ASA: American Society of Anaesthesiologists physical status classification.