What does S1-S2 intervertebral disk space is vestigial mean? Im 37 in the Us Army, active duty, 6ft 218lbs., have had past back problems, mid an lower back with numbness an tingling down my left hip an leg. Have had 14 stress fracture's as well in my lower leg's to which when the army found them they thought i had hip fracture's but shortly after i did not.