Observational study of a new modular femoral revision system

Table 1 Baseline data

	Count (valid percent)	Mean (range)
Sex
Male	57 (49)
Female	59 (51)
Age at operation (yr)		73 (39-95)
ASA
1	21 (20)
2	54 (51)
3	31 (30)
4 and 5	0
Missing data	10
Cause for revision
Aseptic loosening	80 (69)
Periprosthetic fracture	17 (15)
Infection	14 (12)
Other	5 (4)
Missing data	2
Revised stem
BiMetric	38 (32)
Spotorno	20 (17)
Lubinus	22 (19)
Spectron	7 (6)
Corail	6 (5)
Taperloc	2 (2)
Scanhip	2 (2)
Müller	4 (3)
Girdlestone	4 (3)
Osteostynthesis	3 (3)
Other	7 (6)
Missing data	1
Cemented	72 (62)
Not cemented	44 (38)

ASA: American Society of Anaesthesiologists physical status classification; (1) Patient is a completely healthy fit patient. (2) Patient has mild systemic disease. (3) Patient has severe systemic disease that is not incapacitating. (4) Patient has incapacitating disease that is a constant threat to life. And (5) A moribund patient who is not expected to live 24 hours with or without surgery.

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.