DDD concerns. You guide me to the truth.

I am planning to get married to a guy who had a surgery 10 years back. My fiance suffered from condition called atlantoaxial dislocation which was pressing on nerves and surgery had to be done to release the nerve compression which could have lead to quadriparesis. I hope now there won't be any problem related to that condition as already fixation of sad is done, there is some residual weakness because of which he is limping. A general physician said, in future he might have degenerative diseases of spine early than others. Doing Regular exercises will keep check on his health issues.. but i wanted to consult neurosurgeon once for my family's satisfaction. I truly want to be with him. He still suffers walking properly. My family is concerned that in future what if his conditions worsen. I am attaching his reports...i really will be obliged if you guide me to the truth.