Some questions:
Is the potential for infection issues more prevalent with ADR's as opposed to other spine hardware such as plates and cages? Has there been any statistics gathered on "other" spine hardware and infection? If so what is the course of action?
If there is infection such as Steve had, is ADR removal the only solution? Or is early detection and treatment beneficial?
Which if early detection is advantageous, what is the best test / follow up? Periodic Xray's to identify subsidence of the ADR? Or would a blood test be appropriate?
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