My brother in law recently met with 2 accidents and both of his legs are affected. He can't be able to sit properly for some time and if done so he is facing problems like burning of soul of both legs followed by numbness and pain from knees to thighs. When consulted the doctor he suggested for a L5 S1 disectomy due to a ruptured disc. But does it contribute to back pain also....? And he keeps complaining like part of his bones in the body feels pain sometimes. What are the probable reason for the issue and he is an athletic posture and daily walks for around 4 km.