Reducing the failure rate of hip resurfacing in dysplasia patients: a retrospective analysis of 363 cases

Table 5 Metal ion data

Variables	Group 1 (Pre-2008)			Group 2 (Post-2008)			P-values between Group 1 and Group 2
Variables	Unilateral (N = 51)	Bilateral (N = 50)	P-value	Unilateral (N = 118)	Bilateral (N = 72)	P-value	Unilat I vs II	Bilat I vs II
Co^a (μg/L)	1.7 ± 1.90	3.1 ± 2.32	0.0013^b	1.3 ± 0.93	2.2 ± 1.33	<0.0001^b	0.0679	0.0076^b
Cr^a (μg/L)	1.6 ± 2.15	2.5 ± 2.04	0.0235^b	1.2 ± 1.10	1.9 ± 1.67	0.0006^b	0.1107	0.0775
Follow-Up Date (Yrs)	5.4 ± 1.93	6.5 ± 2.24	0.0095^b	2.2 ± 1.14	2.5 ± 1.16	0.0821	<0.0001^b	<0.0001^b
#, % Patients Tested	105 (87 %)		--	187 (77 %)		--	0.0316^b
#, % Levels Converted	17 (33 %)	21 (42 %)	0.3320	26 (22 %)	19 (25 %)	0.5961	0.1416	0.0510
#, % Revised (Excluded)	15 (12 %)	6 (5 %)	0.0394^b	2 (0.8 %)	0 (0 %)	0.1556	<0.0001^b	0.0005^b
#, % Revised AWRF (Excluded)	2 (1.7 %)	2 (1.7 %)	1.000	0 (0 %)	0 (0 %)	1.000	0.0444^b	0.0444^b
Normal (#, %)	32 (56 %)	6 (12.5 %)	<0.0001^b	86 (77 %)	20 (28 %)	<0.0001^b	0.0058^b	0.0466^b
Optimal (#, %)	49 (86 %)	35 (73 %)	0.0949	111 (99 %)	63 (88 %)	0.0007^b	0.0003^b	0.0434^b
Acceptable (#,%)	7 (12.3 %)	12 (25 %)	0.0910	3 (2.7 %)	9 (12.5 %)	0.0085^b	0.0124^b	0.0767
Problematic (#, %)	1 (1.8 %)	1 (2.1 %)	0.9045	0 (0 %)	0 (0 %)	1.000	0.1585	0.2187
Potentially Toxic (#, %)	0 (0 %)	0 (0 %)	1.000	0 (0 %)	0 (0 %)	1.000	1.000	1.000

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