NEW YORK – Going to a chiropractor has become an accepted part of medical care, with about 15 per cent of adults in the United States visiting one every year.

Although critics claim the field lacks scientific validity, chiropractic treatments provide many people with pain relief, and a vast majority take place without incident.

But given the delicate nature of the spine – particularly the upper vertebrae of the neck – the consequences of complications can be devastating.

One injury in particular, arterial dissection, in which blood vessels that supply blood from the heart to the brain are torn, is of high concern.

In some cases, a patient may be unaware that an injury has occurred and the damage heals on its own. In others, a tear in the artery wall can cause a clot to form and result in a stroke and even death.

It is unclear how common the complication is following chiropractic care. One estimate says that an arterial dissection occurs in one out of 1,000 neck manipulations, another says one in 5.8 million.

Because of the severity of the injury, though, many spine specialists warn that chiropractic manipulation of the neck can be dangerous. Here is what to know if you are considering the treatment for your neck pain.

The risks of neck manipulation

Chiropractic manipulations involve high velocity, low amplitude movements of the spine.

“We take the joint to its limited range, and we do a very quick push on that joint – that’s the high velocity aspect,” said professor of integrated chiropractic therapies William Lauretti at Northeast College of Health Sciences and a spokesman for the American Chiropractic Association.

“But we’re moving it for a very, very small range – that’s the low amplitude.”

The concern over arterial tears is specific to manipulations of the neck. That is partly because the neck is more mobile and thus more susceptible to injury; the torso is protected by the ribs, so the lower back does not rotate as much.

Major arteries that distribute blood from the heart to the brain are also threaded through the neck vertebrae, making the blood vessels there more vulnerable.

Dr Betsy Grunch, a neurosurgeon based in Gainesville, Georgia, said: “When you turn the neck side to side, those vessels will rotate within the bone.

“If you turn your head quickly or rotate quickly, like a car accident or manual manipulation or sport, the vessel can get abruptly torqued.”

The most common symptoms of an arterial dissection are headaches, dizziness and vertigo. Weakness, numbness or paralysis on one side can also occur.

In a widely publicised case in 2022, a 28-year-old graduate student at Georgia Southern University named Caitlin Jensen became dizzy and nauseated after a chiropractor manipulated her neck.

The chiropractor called 911 and, at the hospital, doctors determined Ms Jensen had tears in four blood vessels, resulting in a stroke and cardiac arrest.

Several studies have shown the risk of arterial dissection and stroke to be three to 12 times higher in people who have recently had a neck manipulation, according to a review by the American Heart Association’s Stroke Council.

To Dr Grunch, who treats one or two patients with the injury every year, the connection is clear. “Arterial dissection is a known complication of spinal manipulation.”

So even though the risk is low, Dr Grunch strongly advises against having your neck manipulated by a chiropractor.

Dr Alan Hilibrand, chief of spine surgery at the Rothman Orthopaedic Institute in Philadelphia and a former president of the Cervical Spine Research Society, said that “there’s no smoking gun” in the scientific literature tying chiropractors to arterial dissections.

But, he added, “I’m very uncomfortable” with it, and he cautioned patients that neck manipulations could be dangerous.

Are chiropractors being unfairly blamed?

Many chiropractors dispute the claim that their treatments can cause such significant harm.

They point to review papers that have found no link between neck manipulations and arterial tears and research showing that people who visited a primary-care doctor were just as likely to have a stroke in the weeks following the appointment as people who saw a chiropractor.

Instead, they say, a visit to a chiropractor is more often the result of an arterial dissection, not the cause of it.

“These patients have an artery that’s been injured in some way”, causing neck pain and headaches, Prof Lauretti said. “Some of them go to their primary-care doctor, some of them go to their chiropractor. If the patient has a stroke following a visit to the chiropractor, the chiropractor gets blamed.”

The risk of complications from chiropractic treatment of other parts of the spine is extremely low, and some research suggests that the practice is as beneficial as home exercise, physical therapy and medication.

As a result, many orthopaedic surgeons and neurosurgeons – including Dr Grunch and Dr Hilibrand – will occasionally refer patients to chiropractors for issues that are not related to the neck.

“I think incorporating chiropractic treatment as a part of a conservative treatment plan is totally appropriate,” Dr Grunch said.

Dr Hilibrand agreed. “I won’t hesitate to send a patient to someone who I know,” he said. “Many of these people provide very good care.”

So what should you do about neck pain?

Accidents stemming from chiropractic manipulations are very uncommon, but because of their potential severity, it may be best to avoid the treatment if you are experiencing neck pain.

Fortunately, there are several other options available.

The first line of treatment Dr Hilibrand recommends is over-the-counter pain medications combined with physical therapy. “Eighty per cent of the people with neck pain will get better after the first six weeks with just those two interventions,” he said.

If pain persists, Dr Hilibrand said one might want to consider alternative therapies, like acupuncture or a massage technique known as myofascial release.

You could even visit the chiropractor for gentler manual therapy or traction, which involves less aggressive, more controlled stretches or movements. Steroid injections can also be helpful in reducing pain and inflammation.

In some instances, surgery may be required as a last resort, but experts say that noninvasive therapies can often resolve the problem.

“Most patients with acute neck or acute back pain don’t need surgery,” Dr Grunch said. “They just need a good, well-balanced conservative treatment plan.” NYTIMES