Thanks for replying friends.

Pain is not a problem for him and his major concern is his numbness in the sole of his foot (lateral aspect). Initially he had numbness in the back of his leg and thigh above his knee which has resolved now. He does not feel any pain in his leg during the application of mobs, however he feels the tingling sensations on his other leg.

I have checked his stork's test which is negative for any spondylolysis.

Thanks again for your replies.