“Systematic reviews of controlled clinical studies of treatments used by chiropractors have found no evidence that chiropractic manipulation is effective, with the possible exception of treatment for back pain.[8] A 2011 critical evaluation of 45 systematic reviews concluded that the data included in the study “fail[ed] to demonstrate convincingly that spinal manipulation is an effective intervention for any condition.”[10] Spinal manipulation may be cost-effective for sub-acute or chronic low back pain, but the results for acute low back pain were insufficient.[11] No compelling evidence exists to indicate that maintenance chiropractic care adequately prevents symptoms or diseases.[12]”
https://www.ahajournals.org/doi/full/10.1161/01.str.32.5.1054
Thank your pointing this out. It’s not just any stroke too, it’s primarily vertebral/basilar artery distribution strokes. Those supply the brain stem which includes such necessary functions as control of breathing and consciousness. You don’t want a stroke anywhere, but particularly not there.
Some chiropractors might swing back that, you’ve only showed correlation not causation. Well, when we have no clear evidence of chiropractic neck manipulation being helpful for anything, and we have a likely very dangerous correlation, the clinical parsimony is just not there. So no one is going to run that study (give a large amount of people neck manipulation, a large amount of people no neck manipulation, and compare rates of stroke that occur afterwards), it would be very unethical, no institutional review board would ever approve that study as ethical to perform.
And it makes a lot of sense too, the vertebral artery is encased in the neck vertebrae, so violent movements of the neck vertebrae can stretch and tear those arteries. Those tears, called a dissection, can sometimes obstruct blood flow all on their own, but more often create a spot for blood clots to form that then move onward into the brain and basilar artery (since there’s turbulent blood flow and a defect in the smooth artery wall that normally prevents your blood from clotting). So please, no violent neck movements for any reason, chiropractor or otherwise.
This. My friend had a triple stroke shortly after having neck manipulation done by a standin for his usual chiropractor. Luckily he survived, but it has very much opened my eyes to how dangerous it can be.