Table 1. Patient Characteristics.

Patient	Gender	Age (yr)	ASR implant type	ASR implant in-situ time (months)	Reason for revision
1	male	46	ASR XL modular	22	extremely high blood metal ion levels
2	female	49	ASR XL modular	31	extremely high blood metal ion levels
3	female	58	ASR XL modular	30	high blood metal ion levels, pseudotumour
4	male	75	ASR XL modular	39	high blood metal ion levels, pseudotumour, symptoms
5	male	65	ASR XL modular	42	high blood metal ion levels, pseudotumour, symptoms
6	female	54	ASR resurfacing	67	symptoms
7	female	46	ASR XL modular	81	high blood metal ion levels, symptoms
8	female	73	ASR resurfacing	63	high blood metal ion levels, pseudotumour, symptoms
9	male	74	ASR XL modular	43	high blood metal ion levels, pseudotumour, symptoms
10	female	64	ASR resurfacing	85	high blood metal ion levels, pseudotumour
11	female	56	ASR resurfacing	29	high blood metal ion levels, pseudotumour, symptoms
12	male	52	ASR XL modular	62	high blood metal ion levels, symptoms
13	female	63	ASR XL modular	52	moderately elevated blood metal ion levels, symptoms
14	male	67	ASR XL modular	54	high blood metal ion levels, pseudotumour, symptoms
15	female	64	ASR XL modular	76	high blood metal ion levels
16	male	65	ASR XL modular	39	high blood metal ion levels, pseudotumour, symptoms