Table VI.

Patient demographics of those who gave matched samples for serum and whole blood metal ion analysis

	Implant*
Characteristic	ASR/ASR THR	BHR/BHR THR	Pinnacle
Patients (n)	416	165	467
Male:female	245:171	97:68	127:340
Mean time in situ (mths) (range)	32 (1 to 82)	55.4 (18 to 79.2)	66 (12 to 109)
Mean age (yrs) (range)	56 (25 to 83)	51 (32 to 68)	63 (21 to 83)
Median whole blood (µg/l) (range)
Cobalt	2.53 (0.13 to 271)	1.82 (0.63 to 147)	2.13 (0.22 to 215)
Chromium	5.82 (0.36 to 108)	6.19 (0.78 to 53.5)	5.30 (0.47 to 67.3)
Median serum (µg/l) (range)
Cobalt	2.99 (0.20 to 228)	2.29 (0.65 to 190)	2.63 (0.37 to 204)
Chromium	5.31 (0.42 to 115)	5.48 (1.30 to 92.9)	4.45 (0.62 to 108)

* ASR, Articulating Surface Replacement; THR, total hip replacement; BHR, Birmingham Hip Resurfacing