Table 3.

Plasma metal ion concentrations pre-operatively and at the one year follow-up given as mean (standard deviation). Detection limit was 0.5 μg/l for cobalt, chromium and molybdenum and 1.0 μg/l for nickel. Values below detection limit were set to 0.25 μg/l for cobalt, chromium and molybdenum and to 0.5 μg/l for nickel

	Coated TKA implant	Standard TKA	p
Cobalt
Pre-operative	0.53 (0.33)	0.67 (0.54)	0.493
1 year	0.45 (0.37)	0.50 (0.44)	0.714
Chromium
Pre-operative	0.54 (0.60)	0.50 (0.42)	0.519
1 year	0.31 (0.15)	0.35 (0.31)	0.561
Molybdenum
Pre-operative	1.29 (1.78)	1.21 (0.74)	0.111
1 year	0.90 (0.85)	0.97 (1.09)	0.742
Nickel
Pre-operative	0.69 (0.42)	0.88 (0.66)	0.087
1 year	0.78 (0.66)	0.62 (0.32)	0.321