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Thank you so much for your replies, sqad. I'm sorry I didn't give you enough info. I was a bit upset when the full truth hit me (tbh I also had another couple of glasses of wine).
I had hoped that a discectomy might help me, but the condition turns out to be worse than that and a fusion is necessary.
"During the operation I will insert several pieces of metalwork to stabilize your spine and probably a cage at the front of your spine. Any of these can break or migrate.......(risks then explained).
"The operation I will perform is considered a temporary measure until your spine fuses. There is a possibility of not achieving a solid bony fusion in which case your spinal stability relies on the metalwork and therefore you are at risk of an implant fracture..."
On the plus side, my bone density is good for my age after an active life :) One other consideration is that my very dear Mr J2 has had a tumour removed in May (clear) followed by a minor heart attack in June and a fall from the attic down the stairs in July (lots of blood and a broken rib) and at 84 this has all knocked him somewhat and he is taking a long time to recover. I don't think that he could cope very easily with the strain of my op. and the recovery time needed.
All in all, I'm inclined to put it off as long as possible, but it is so hard! I look fine, but 10 mins. standing in a queue is agonising and people don't like it if I ask to queue-jump. :( I think that if I find myself unable to stand to sing with my choir (helps morale and asthma) I may ask for the op.. It was first offered to me in France in about 2006, but I didn't realise the seriousness.
Thank you very much. :)