What is the actual dermatomal distribution of the altered lower limb sensation? It might not be the result of the L4/L5 Wikipedia reference-linkspondylosis. Best to map it out to try and implicate the root level or peripheral level and let us know if this coincides with the investigations. Just about anyone over the age of 50 has a degree of spondylosis creeping in and it's not always the cause of the symptoms. I think it is wise that if you are treating a problem the best way you see fit, and there is no progress, then perhaps you should reassess what the actual problem is and revise your initial diagnosis. No offense intended

:smokin