If there is a structural problem on the scans he may benefit from surgery. If he has not had an EMG, that would be helpful. An EMG tests the muscles and nerves, and can help localize which nerves are injured and potentially where. If this is a femoral neruopathy, besides problems in the spine, it could be do to diabetes, inflammation with the spianl fluid, injury (trauma), vascular damage to the nerve, or something pushing on the nerve after it leaves the spine. To help evaluate these possibilities he may have an MRI scan of the pelvis and thigh to look at the nerve and ensure nothing is pushing on it. A blood test for diabetes can also be helpful. Then a spinal fluid analysis could be considered.
The best type of doctor to evaluate this problem is a neurologist, and if he has already seen one, then perhaps a second opinion at an academic center would be appropriate. Good luck.
My doctors are still looking into what has caused it and I should have some answers by this week. I have been going down hill for the last five years and they still do not seem to have the answers for me.
I have done the physotherapy on and off for the last 2 years and it does not seem to help much. We are fed up as well as we are fighting to get the money to cover everything from shoes to boots to fit a brace that I have to wear. Have the doctors mentioned anything to you in regards to it being called drop foot? As this is what they have called mine with my leg which has been caused from my back.