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Table 5 Metal ion data

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

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