Its preference really. Mine happens to be in my left ear because my other has other piercings.
getting an ear piercing has nothing to do with a knee surgery so you should be fine.
Whichever side you would like. There is no right answer.
Oh, dude, technically, yeah, you can still get an industrial piercing even if you have your helix pierced. It's like having a sandwich with extra toppings, you know? Just make sure your ear can handle the extra bling without freaking out. But hey, if you're up for it, go for that industrial look and rock it like a boss!
The same as any other ear piercing I suppose - infections mainly.
Some times.
The major risks of an industrial piercing include ear deformation, migration and even rejection. If it is not properly taken care of it can move, and be very painful. Someone very experienced should preform this piercing, as if it is not done properly, the risk grows higher.
Done wrong, a piercing can definitely cause paralysis on the face... whether the piercing is ear, tongue, nose, etc.
You can be any age as long as you have your parent's permission and they are present at the time that you are getting the piercing.
After the first
It will be painful and swollen and moving towards the outer part of your ear, i.e rejecting.
He has an industrial piercing on his left ear, this is sometimes called a scaffolding bar, it is a long metal bar through the top of your ear. He also has a labret piercing, this is the piercing of your chin, just under your bottom lip. & that's all he had!!
I should think that ear piercing is the least painful