She can not walk or stand 15 min or more

She has been facing this issue for last 6 months. Prior to that she had knee pain which is not now. She were taking some medicines under the consultation of orthopaedic surgeon, however did not help at all. He advised us to get whole spine screening which we did and doctor observed that the bones covering the spinal cord has been compressed more particularly L1 to L6 and S1 to S2 and this causing a balancing issue while walking and standing for more than 10 min. He advised for spine surgery in L1 and L6 area but himself said not preferable at this age as recovery is not guaranteed post surgery. I would like to know here which expert is required here to guide us the best. I would like reach out the best doctor in Mumbai Thank you very much in advance