@Cath62 it would have been a shock considering it was just caused by lifting your grandson. But as @iserbrown says at least you now know. Now you can stop the bones from deteriorating more by having the prolio injection. I do weight bearing exercises and resistance exercises and I feel they keep me stronger. I also do some falls prevention exercises at home. COTA (Council of the Ageing) have also some really good online exercises you can do, and also they can direct you to the Living Longer, Living Stronger classes that are run in different locations. Of course your physio will have some programs also. Another program that springs to mind is the GLAD program (Good Living Arthritis Denmark) and the program runs for 6 weeks, twice a week. That can be expensive, but I was able to go through that after a 2 year wait in the public system, but in the meantime I did some of those exercises through watching online.
I hope you heal well from your fracture, and the pain is easing for you. All the best with your treatment.