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Table 1 Patient characteristics by implant type

From: Does bearing size influence metal ion levels in large-head metal-on-metal total hip arthroplasty? A comparison of three total hip systems

  Durom Birmingham Pinnacle p valuea
Age in years (mean ± SD) 61.7 ± 5.9 60.4 ± 11.3 56.5 ± 9.2 0.2251
Female sex 31.6% 73.7% 93.8% 0.0003
(6/19) (14/19) (15/16)
BMI (mean ± SD) 30.2 ± 7.1 30.7 ± 7.4 28.4 ± 4.3 0.5559
Diabetes 5.3% 5.3% 0.0% 1.0000
(1/19) (1/19) (0/16)
Smoking 15.8% 21.1% 12.5% 0.9011
(3/19) (4/19) (2/16)
SF-36 (mean ± SD) 85.6 ± 12.0 84.1 ± 12.5 79.6 ± 18.7 0.4639
Harris hip score (mean ± SD) 80.0 ± 15.9 76.4 ± 15.3 78.1 ± 16.9 0.7832
UCLA activity scale (mean ± SD) 6.5 ± 1.7 7.1 ± 1.7 7.1 ± 1.3 0.4456
WOMAC score (mean ± SD) 84.3 ± 11.8 82.2 ± 13.7 80.7 ± 13.2 0.7122
Cobalt (μg/l) median (25th, 75th percentile) 2.8 3.3 0.5 <0.001
(1.5,3.6) (1.4,4.1) (0.4,0.7)
Chromium (μg/l) median (25th, 75th percentile) 2.0 2.2 1.2 <0.001
(1.5,2.5) (1.5,2.7) (1.0,1.4)
Head size (mm) median (25th, 75th percentile) 48.0 48.0 40.0 <0.0001
(44.0,50.0) (44.0,54.0) (40.0,40.0)
  1. ap value (Pinnacle vs Durom and Birmingham implants).