I have had a cartilage infection for well over 6 months now with drainage , i've been to er , family dr , med center & infectious disease dr can't get?

Infection: Cartillagenous tissues are difficult places in which to clear infections because they are avascular (no blood supply) and antibiotics do not get in well. You did not say where this was located, but you are seeing the proper specialists. Perhaps they need to consider surgical excision of the area involved (if this is possible). Good luck and hope this resolves soon.

Bone and joint: Infections can be difficult to treat especially if they are chronic or there is hardware. I would suggest having a detailed conversation with your infectious disease doctor. Surgery is often needed in these cases. Also it is very important to take all prescribed antibiotics as directed. There is no easy cure for this.