It's not necessary, however, many medical doctors have teamed up with chiropractors in their efforts to help patients. Every major hospital around the country has either an affiliation with a chiropractor or one who practices with the hospital.
The last few years have been a revolutionary time for expansion into the area of holistic healing. The days of MD's badmouthing chiropractors are over. If the medical profession did not get on board with the holistic healing movement then they would be left out. They would antiquate themselves because all the evidence shows that with the exception of the older generations, the largest demographics of our population are opting for natural, non-invasive and holistic healing options.