Is cartilage of pelvis joint regeneratable?

i have undergone surgery of pelvis joint, cartilage among bones has been damaged due to osteomilitus, after 2 years of syrgery and after complete recovery from TB, there is still damage in joint, according to doctors cartilage has been damaged and the cartilage cant be regenerated. is it right? is there any medicine ar any diet that help in cartilage regeneration?