Any drug can be used, misused, or abused. Make sure your friend knows that Tramadol has the potential for misuse or abuse as much as codeine, hydrocodone and oxycodone do.
There is no reason for a recovering addict to suffer in pain when there are medications that will help. Tramadol is probably the least of these, IMO. But your friend needs to go into this with wide open eyes, should share at meetings about this, and should certainly contact his/her sponsor ahead of time.