The 'acid' jab that may beat back pain for good

A once-in-a-lifetime jab may treat back pain. In a new trial, injections of lactic acid — a syrup-like substance formed in sour milk and found naturally in our bodies — are being given to 120 patients with lower back pain caused by disc problems.

The researchers say that the jab will make the discs, which sit between the bones (vertebrae) of the spine, tougher and more resilient — and could remove the need for surgery for many.

Around eight in ten people have back pain at some point, and up to one in four cases is caused by disc problems.

The researchers say that the jab will make the discs, which sit between the bones (vertebrae) of the spine, tougher and more resilient — and could remove the need for surgery for many

The researchers say that the jab will make the discs, which sit between the bones (vertebrae) of the spine, tougher and more resilient — and could remove the need for surgery for many

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Discs work as shock absorbers but also provide flexibility for the movement of the spine and prevent the vertebrae rubbing together. They are made of an outer ring of tough connective tissue and a gel-like middle.

As the discs degenerate with age, tears in the outer casing can occur, causing instability between the bones and triggering tension and pain in the surrounding joints and muscles. 

As the disc continues to degenerate, the gel-like middle can bulge out, which compresses nerves and results in inflammation and pain.

Treatment options range from painkillers and physiotherapy to steroid injections and surgery to remove the damaged disc or fuse the spine.

Lactic acid is a natural by-product of energy production in the body — it builds up in the muscles after exercise and is thought to be what makes them ache.

Its use in alleviating back pain is based on the idea that it encourages the development of collagen, which makes the disc tougher and resilient. Orthopaedic surgeons have long reported that patients experiencing back pain related to disc problems often have less pain as they get older, as with age the collagen in the discs becomes tougher and so the discs are able to provide more support to the spine. 

Lactic acid is a natural by-product of energy production in the body — it builds up in the muscles after exercise and is thought to be what makes them ache

Lactic acid is a natural by-product of energy production in the body — it builds up in the muscles after exercise and is thought to be what makes them ache

But these changes take decades, and the theory is that the lactic acid injection has the same effect — but in weeks.

Animal studies have shown that just one month after the injection, the centre of the discs had been replaced by dense fibrous tissue, as the collagen solidifies.

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A small trial on 15 patients at the Stockholm Spine Centre in Sweden found no serious safety issues and MRI scans suggested the discs did become more solid after the jab.

In the new trial in hospitals in the Netherlands, Spain and Russia, patients will have the jab or a placebo. The researchers say they expect the benefits to be felt within four to 12 weeks and will hopefully last the patient’s entire life.

Commenting on the study, Ian Harding, an orthopaedic consultant at North Bristol NHS Trust, says: ‘Back pain is caused by many different diagnoses, of which a minority will be caused by the disc itself. Any treatment that can help and avoid more invasive high-risk treatments warrants investigation.

‘Studies such as these may lead to large trials and a better understanding of the problem.’

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