Mother's lumbar spinal stenosis

You have been farming in the countryside for a long time and are now 70 years old. Sitting all day, bending your back, and working in poor posture have gradually worsened your back condition. I took my mother to a nearby hospital, and they said that a metal rod needs to be inserted into her back. The surgery costs nearly ten million won. Back surgery is very important, so I think I should go to a large hospital in Seoul. It takes only four hours by bus, but taking her along is not easy. Does anyone have a recommendation for a hospital in Seoul that specializes in back surgery?