I Had Harring Ton Rods Put In When I Was

I had Harring ton rods put in when I was 11 I'm 37,I have disc degeneration and scoliosis also osteo atheritis and I had my left hip replaced I need to know why I have to go through every day to crack my thoractic region and lower back region to get much relief I get soo much pain in my back I cant do anything through my days,im always in pain what is it why do I need to crack my back so much for relief,im v been on pain meds for 16yrs they only help but rarely work,i also need the right hip replaced aswell..