I have klippel feil syndrome with fusion of c2-c4 and c5-c7, stenosis between c4 and c5 and poking into my spinal cord. I have spasticity, numbness in my left hand and losing my balance when I walk. I am 53 with HBP and a heart murmur. I have had mrsa and recently had staph infection in my lymph nodes and tested positive for Factor 5 (need blood thinner). What are my odds of having a successful operation to have my vertebra screwed to a plate to make me more stable?