Bignew, I'm very sorry to hear of your dilemma. However, only you will know what is right for you. If you sold the bike would you plan on saving the payment money to put on a bike in the future or would you plan on using the money on other expenses? Is there a possibility that you won't be riding for a period of time? 18-24 months?
Would buying a classic car be better for you? That would be an option that you could enjoy with less physical demands. However, depending on your location, if you are like me, I don't ride much in the winter due to mainly salt and chemicals on the roads and throw in the cold and I just don't enjoy riding. Therefore, you may consider keeping the bike through the winter and see how you feel in the spring; considering the possibility that even if you were healthy enough to ride, you may not log many miles regardless.
The other consideration is will you be able to ride in the future? My nephew who just turned 26 is dealing with this issue right now due to breaking his leg last December while riding a stunt bike. He has finally accepted that he cannot ride the crotch rocket he had due to the damage to his leg. He decided that the best decision for him would be to sell his bike so he bought another four wheeler for his wife to ride. He thinks he may be able to ride a cruiser later on down the road, but for now, he realizes that he needs time to heal the bone. He didn't like the decision, nor does he like the fact that he may never be able to drive a stick shift again, but it is what it is and he is learning to accept it and play with the hand that is dealt.
Lots to consider, I wish you the best. :s Good luck!