It has to be pretty severe to prevent a spinal. An awful lot of adults have arthritis in the spine to one degree or another but it doesn't usually bother the doctor.
You can see that here
Pre-op interviews - what's involved?
Not inevitably, Reanna. There are a great number of different kinds of dressings on the market. Some are fully waterproof and other are not. Don't take it for granted which you will have.
Mostly we call it a spinal. And epidural is different but only for the doctor!
Anaesthetics - spinals, femoral blocks, GAs and everything else
That's easy to fix - just tell the anaesthetist that as he is doing your spinal. For my first knee, the anaesthetist (whom I knew!) asked me if I had any 'final wishes' and I said yes, I don't even want to see the tourniquet being put on or the theatre doors opening! He gave me the thumbs up and was as good as his word. Between lights out after the spinal and waking up, I knew nothing until I was in recovery!