Does anyone have a LO with lumbar stenosis?

We took FIL on a short weeeknd trip 2 1/2 hours from home to visit friends and get him out of the house for a change of scenery. We made stops to get out and stretch and he was fine on the way there. At the hotel that night he began to complain of some discomfort in his lower back / buttocks region. He went to bed early and felt better in the morning but once we got home he could not use his left leg at all and his right leg was weak. The doctor thinks he has a pinched nerve in his spine and we get MRI results tomorrow but he is wheelchair bound now and keeps trying to get up to prove to us he can walk ( which he can’t). Only a matter of time til he falls I fear. I’m wondering if anyone has a senior who underwent spine surgery or had a pinched nerve and what was their treatment protocol? I realize every body is different but can a 90 year old person handle a surgery to repair stenosis?