My son has leg atrophy above his knee and down to his foot. They conducted several tests and ruled any disease or tumor out. He has had numerous emg s and they concluded that he has sciatic nerve damage. The sciatic are is above his knee back side of his thigh mid point. He had a biopsy which concluded that the nerve was damaged possibly due to a hockey puck. They said the nerve was discolored and the consistency was abnormal. We have reached out to John Hopkins in Maryland for a second opinion. All the tests and results were sent down to them. They said there was nothing they could do. My son is now experiencing numbness in his toes and his foot is curling. He is loosing more muscle and his leg is getting smaller. Is there anywhere we can take him who specializes in something of this nature. Upset and so concerned....Melissa.