My father is 80 and has peripheral neuropathy.  He is not a diabetic.  He had a bad case of sciatica after injuring it while shoveling about 6 or 7 years ago and  started treatment with  injections; however he only had one injection before he was diagnosed with coronary artery disease and underwent open heart surgery, so he only had one shot in his lower back.  He has had a few MRIs and CT scans and it appears that nothing shows up that could be pressing on his back causing the numbness.  Is there anything at all that may help him or can you recommend another test that might determine whether or not there is something causing his feet to be numb?
Hi, Welcome to Chat Doctor, Your father is having numbness in feet, which is symptoms of Neuropathy, pain was due to sciatica, he has be operated for coronary artery disease, I presume he must be taking all treatment. His MRI is not showing any compression, then neuropathy may be caused by nutritional deficiency like B12,other causes includes alcohol induced, any Chat Doctor. He should visit a Neurologist and get Nerve conduction study and EMG. You have mentioned he is not a diabetic, once cause of neuropathy is detected it can be treated.In the meantime take good care of feet and treatment like neurotrophic vitamins, Pregabalin, Gabapentin may be given to see if it gives symptomatic relief. If his pain is severe he may get good relief with Epidural injections. Please take care. Good Luck