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I am an internist (MD).
I think the chiropractic profession would make more headway in getting MD and DO's to want to work with you if there weren't chiropractors around who do really wacky things. I mean, some are selling their patients vitamins of dubious or no benefit, and some are telling patients they have "disseminated yeast infections" when there is no evidence of that. Also, they need more research/trials to show that chiropractic techniques are effective...I think it's probably hard to do, though, since I'll bet a lot of it depends on the skill of the person doing the techniques. Many MD/DO's also are familiar with the risks of stroke after chiropractic manipulation in people who have carotid artery dz, so chiropractic gets a bad name for that reason. I actually believe that chiropractic could be useful for some back and hip pain, etc. ...it seems logical that it could but it's a shame there isn't more extensive research about these techniques.
Finally, although there are unscrupulous MD/DO's, it seems to me from my personal experience that there are more shady chiros who seem to be willing to do anything for money. It's a shame b/c I think it leads to all of them getting tarred with the same brush. I personally had a roommate who was getting over influenza, was feeling a bit run down and went to see a chiro...he basically told her she needed to come back to his office every week for the next 8 weeks, or she was basically going to die or something. It was RIDICULOUS. He left a message on our answering machine that was basically kind of scary, making it sound like she had some deadly health problem that only HE could fix. Luckily, I was in 1st year of med school at the time, and put a stop to that nonsense ASAP. With a little R and R, she was fine in a week. Another thing that I think is bad is that some of the DC's seem to go around telling their patients that we (MD's) are somehow in a conspiracy with the drug companies and that we just don't want patients to get better because we are all evil and money grubbing and just want to poison patients with a bunch of pills, and that is totally not true.
As far as knee arthroscopy for OA, there's not much evidence that it helps...unless the patient has mechanical symptoms such as the knee locking up on them, etc. In those cases there is evidence of benefit, probably b/c the orthopod might be able to find the problematic area(s) and clean them up. I think a lot fewer patients with OA are getting knee arthroscopy now that the NEJM published that study...I certainly don't recommend it to any of my patients with garden variety OA knee pain.
These are fair points. Outlandish claims by anyone, chiropractors included, are simply unacceptable.
As far as risk of stroke following cervical manipulation, I think it's important to keep the numbers in perspective. This is an exceedingly rare occurrence, to the point where it has been difficult to quantify. Estimates range from one in 500,000 to one in several million. The most recent and extensive review on the subject (Spine, 15 Feb 2008) found that the incidence of stroke following cervical manipulation was no greater than the incidence of stroke following a visit to a PCP, leading to the thought that in most cases the vertebral artery has already dissected prior to seeking treatment. (You mentioned carotid artery disease. There isn't much out there in terms of injury to the carotid and cervical manipulation. The vertebral/vertebrobasilar artery is the one in question.) The risk needs to be kept in mind here.
Regarding availability of research, there are about 40 or so RCTs looking at spinal manipulation and low back pain and a dozen or so for neck pain. That's not all that bad. It's probably fair to say that, for low back pain at least, there isn't any intervention more studied than spinal manipulation. There have been over the years a number of 'guidelines' issued for low back pain, and spinal manipuation is always there in the "Recommended" category. A recent one is from the American College of Physicians (http://www.annals.org/cgi/content/full/147/7/478), where spinal manipulation is the ONLY non-pharmacologic treatment recommended for BOTH acute and chronic low back pain.
As I've stated elsewhere, if we've learned anything from the spine pain literature it's that no single intervention works perfectly. There is no silver bullet. Spinal manipulation works about the same as everything else, in some cases better and in some cases not better. For your neck and back pain patients, consider chiropractic care for those that aren't doing well with the standard treatment efforts.
And bear in mind that there are many types of spinal manipulation/mobilization, and that chiropractors also advise patients on rehabilitative exercises, postural and ergonomic issues, etc. Please don't be of the belief that chiros simply lay patients down and start banging recklessly on their spines.
As far as the drug company conspiracy thing, I don't think that is much of an issue. I do, however, think that chiropractors and any healthcare professionals for that matter do not want to see patients simply default to a lifelong usage of a medication when other options are available and haven't been tried. Of course there are lifesaving meds, and of course there are situations where a patient has no choice but to take a med for life. Although this goes beyond the scope of discussing any single MD/DO's role, there is a tremendous lack of seriousness paid to lifestyle interventions in our healthcare system despite very compelling evidence in their favor. Some of that, you must admit, has been driven by pharmaceutical dollars influencing our system.