Does Untreated AVN Lead To Osteoarthritis?

Hello, I was in a bad work accident in 2005. Since then I have had two C-5 C6 Fusions and a L-5 S-1 post, and anterior fusion. I was diagnosed with AVN of the femoral head in 2006. I am now almost unable to walk. And can not sleep. I had a CT scan done because I am unable to have MRI due to the fact I also have a spinal cord stimulator implant so unable to do MRI. The CT was read and it stated that there is no evidence of AVN but there is mild osteoarthritis in the left hip. I understand that if AVN is in fact not treated it can and will turn into Osteoarthritis. If in fact it is Mild why does it hurt so badly? What are my options?