Today, 29 July 2009, a large number of magazines and blogs will publish simultaneously Simon Singh’s article. The Guardian was forced to withdraw it, but what he said must be heard (even if the word ‘bogus’ is now missing).
This is an edited version if the article in the Guardian that resulted in the decision of the British Chiropractic Association to sue Singh for libel. That decision was bad for Singh, though its effects could yet be good for the rest of the world, Firstly the decision to use law rather than rational argument stands a good chance of destroying chiropractic entirely because its claims have now come under scrutiny as never before, and they have been found wanting. Secondly, the support for Singh has been so enormous that there must now be a good chance of getting the UK’s iniquitous laws about defamation changed.
Beware the spinal trap
Some practitioners claim it is a cure-all, but the research suggests chiropractic therapy has mixed results – and can even be lethal, says Simon Singh.
You might be surprised to know that the founder of chiropractic therapy, Daniel David Palmer, wrote that “99% of all diseases are caused by displaced vertebrae”. In the 1860s, Palmer began to develop his theory that the spine was involved in almost every illness because the spinal cord connects the brain to the rest of the body. Therefore any misalignment could cause a problem in distant parts of the body.
In fact, Palmer’s first chiropractic intervention supposedly cured a man who had been profoundly deaf for 17 years. His second treatment was equally strange, because he claimed that he treated a patient with heart trouble by correcting a displaced vertebra.
You might think that modern chiropractors restrict themselves to treating back problems, but in fact some still possess quite wacky ideas. The fundamentalists argue that they can cure anything, including helping treat children with colic, sleeping and feeding problems, frequent ear infections, asthma and prolonged crying – even though there is not a jot of evidence.
I can confidently label these assertions as utter nonsense because I have co-authored a book about alternative medicine with the world’s first professor of complementary medicine, Edzard Ernst. He learned chiropractic techniques himself and used them as a doctor. This is when he began to see the need for some critical evaluation. Among other projects, he examined the evidence from 70 trials exploring the benefits of chiropractic therapy in conditions unrelated to the back. He found no evidence to suggest that chiropractors could treat any such conditions.
But what about chiropractic in the context of treating back problems? Manipulating the spine can cure some problems, but results are mixed. To be fair, conventional approaches, such as physiotherapy, also struggle to treat back problems with any consistency. Nevertheless, conventional therapy is still preferable because of the serious dangers associated with chiropractic.
In 2001, a systematic review of five studies revealed that roughly half of all chiropractic patients experience temporary adverse effects, such as pain, numbness, stiffness, dizziness and headaches. These are relatively minor effects, but the frequency is very high, and this has to be weighed against the limited benefit offered by chiropractors.
More worryingly, the hallmark technique of the chiropractor, known as high-velocity, low-amplitude thrust, carries much more significant risks. This involves pushing joints beyond their natural range of motion by applying a short, sharp force. Although this is a safe procedure for most patients, others can suffer dislocations and fractures.
Worse still, manipulation of the neck can damage the vertebral arteries, which supply blood to the brain. So-called vertebral dissection can ultimately cut off the blood supply, which in turn can lead to a stroke and even death. Because there is usually a delay between the vertebral dissection and the blockage of blood to the brain, the link between chiropractic and strokes went unnoticed for many years. Recently, however, it has been possible to identify cases where spinal manipulation has certainly been the cause of vertebral dissection.
Laurie Mathiason was a 20-year-old Canadian waitress who visited a chiropractor 21 times between 1997 and 1998 to relieve her low-back pain. On her penultimate visit she complained of stiffness in her neck. That evening she began dropping plates at the restaurant, so she returned to the chiropractor. As the chiropractor manipulated her neck, Mathiason began to cry, her eyes started to roll, she foamed at the mouth and her body began to convulse. She was rushed to hospital, slipped into a coma and died three days later. At the inquest, the coroner declared: “Laurie died of a ruptured vertebral artery, which occurred in association with a chiropractic manipulation of the neck.”
This case is not unique. In Canada alone there have been several other women who have died after receiving chiropractic therapy, and Edzard Ernst has identified about 700 cases of serious complications among the medical literature. This should be a major concern for health officials, particularly as under-reporting will mean that the actual number of cases is much higher.
If spinal manipulation were a drug with such serious adverse effects and so little demonstrable benefit, then it would almost certainly have been taken off the market.
Simon Singh is a science writer in London and the co-author, with Edzard Ernst, of Trick or Treatment? Alternative Medicine on Trial. This is an edited version of an article published in The Guardian for which Singh is being personally sued for libel by the British Chiropractic Association.
That’s a great account of the evidence. Notice the conclusion,
“If spinal manipulation were a drug with such serious adverse effects and so little demonstrable benefit, then it would almost certainly have been taken off the market“.
It is the job of NICE to evaluate critically that sort of thing, which makes it all the odder that the NICE guidance group, very unusually, failed to assess properly the evidence for chiropractic.
If you aren’t one of the 15,000 people who have already signed Singh’s statement, please do it now
Resignation of Pain Society president. While we are on the topic of chiropractic, my comment, The hidden cost of endorsing voodoo, appeared at last on the BMJ article about NICE’s low back pain guidance. The thread came back to life after the British Pain Society voted out its president, Paul Watson, a physiotherapist who was a member of the group that wrote the guidance.
Some of the links Links to some of the many repostings of Singh’s article today are aggregated at Sense about Science. There where over 200 in a single day. The British Chiropractic Association tried to suppress criticism, but they clearly don’t understand the web.
“An intrepid, ragged band of bloggers. Chiropractors may regret choosing to sue Simon Singh, springing online scientists into action”. Ben Goldacre has summed up the reaction of the blogosphere with characteristically fine style in the Guardian. Ragged? Moi? The blog version (with links) is here.