Table 2.

Median (interquartile range) patient-reported outcome measures and blood metal ion levels in patients with an ASR HR or an ASR XL THR prosthesis

	ASR HR		ASR XL THR
	Unilateral	Bilateral	Unilateral	Bilateral
No. of patients	272	40	302	48
Cobalt ions, ppb	1.1 (0.6–2.2)	1.75 (1.1–3.0)	2.5 (1.2–6.7)	5.3 (2.5–13)
Chromium ions, ppb	1.2 (0.7–2.0)	1.85 (1.1–2.5)	1.4 (0.9–2.6)	2.4 (1.3–4.1)
Ratio Co/Cr	1.0 (0.7–1.3)	1.1 (0.9–1.4)	1.7 (1.2–3.5)	2.1 (1.2–3.8)
Harris hip score	94 (87–97)	92 (74–97)	91 (81–97)	86 (77–94)
EQ-5D	1.0 (0.8–1.0)	0.95 (0.7–1.0)	0.8 (0.7–1.0)	0.8 (0.6–1.0)
UCLA	7 (6–8)	6 (6–8)	6 (5–8)	5 (4–7)
VAS pain	0.5 (0.0–1.5)	0.5 (0.0–3.0)	0.5 (0.0–1.5)	0.5 (0.0–2.0)