I agree with orionburn, it is best to start with decaf. That's what I did.
Then my nutritionist cleared me for regular coffee at 12 weeks post op. She said to start slowly, which I did. I handled it just fine and now at 4 and a half months post op, I drink 1-3 cups of coffee a day.
But I have read where some people's nuts or doctors don't want them getting back on the caffeine at all, so your best bet is to check with them.