Do you have diabetes. I had surgery last year and thought my back and hip problems were from epidural. Also had foot drop, scans of hip and back negative. Saw neurologist who recommended a neuro physiotherapist. She has done wonders with twice weekly visits, gradual increase of specific exercises and the use of an electric neuro muscular stimulator but it is hard work, especially the latter as the first two programmes are for three hours and I did each programme for six weeks before going to the last one which is just for 30 minutes. Progress is slow but steady. Good luck