Dear Doctor: My 77-year-old back pain persists after surgery — can electrical muscle devices help?

Dear Doctor Roach: I’m a 77-year-old woman with degenerative disc disease. I had an L4 microdiscectomy surgery in 2020, but I still have chronic pain in my lower back. Although I do core strengthening exercises with physical therapy (which helps), I’m still in daily pain. I’ve been seeing advertisements for multifidus muscle-strengthening devices, such as NeuroMD and ReliveX. What’s your opinion on this type of exercise device? -- C.K.