Table 4.

Survival of cementless stems and the cemented reference group. Endpoint was defined as revision due to aseptic loosening of the stem. 7-, 10-, and 15-year survival rates were obtained from the Kaplan-Meier analysis. For prosthesis types, see Table 1

A	B	C	D	E	F	G	H	I	J	K	L
A Age group
B Brand of stem
C Number of operations
D Mean follow-up (in years)
E At risk (7-year)
F % 7-year survival (95% CI)
G At risk (10-year)
H % 10-year survival (95% CI)
I At risk (15-year)
J % 15-year survival (95% CI)
K Adjusted RR a for revision (95% CI)
L p-value
a RR: risk ratio from the Cox regression analysis (other stem brands compared to the cemented reference stems, with adjustment made for age and sex)
All (≥ 55 years)
	Anatomic Mesh	604	11.1	532	98 (97–99)	444	96 (94–98)	91	92 (89–95)	0.53 (0.37–0.76)	0.001
	FU ≤ 7 years									0.38 (0.21–0.71)	0.002
	FU > 7 years									0.64 (0.40–1.00)	0.05
	PCA Std	508	11.6	430	98 (96–99)	351	95 (92–97)	146	89 (86–93)	0.62 (0.44–0.88)	0.007
	FU ≤ 7 years									0.49 (0.27–0.89)	0.02
	FU > 7 years									0.68 (0.44–1.05)	0.08
	Bi-Metric	5,379	6.8	2,698	99 (99–99)	1,463	99 (98–99)	154	96 (94–98)	0.20 (0.15–0.27)	< 0.001
	FU ≤ 7 years									0.18 (0.12–0.26)	< 0.001
	FU > 7 years									0.24 (0.16–0.37)	< 0.001
	ABG I	2,330	6.7	1,152	100 (99–100)	342	98 (97–99)	0	–	0.15 (0.09–0.25)	< 0.001
	FU ≤ 7 years									0.08 (0.04–0.18)	< 0.001
	FU > 7 years									0.40 (0.20–0.80)	0.009
	ABG II	1,489	2.5	0	–	0	–	0	–	0.31(0.13–0.76)	0.01
	FU ≤ 7 years									0.31 (0.13–0.76)	0.01
	FU > 7 years									–	–
	Cemented	9,549	8.8	6,231	97 (96–97)	4,442	95 (94–95)	1,115	91 (90–92)	1.0 (reference)	–
	FU ≤ 7 years									1.0 (reference)	–
	FU > 7 years									1.0 (reference)	–
	Total	19,859