question: I am 52, about 195 lbs and 6 3.I have had two ACL replacements and a third surgery on left knee, found out I no longer have an ACL. I have been expierencing what seems like a deadness in my knee after prolongedwalking. I work for a major railroad and am constantly walking on uneven surfaces,It seems my knees goes dead,then my hip gets really sore, I feel myself walking differently then my lower back starts aching badly. I guess my question is what can I do? I amnow toldi have a bulging disc in the l5 s1 area.