Evidence Review

Why NHS Physiotherapists Are Questioning The Sciatica Protocol

The studies your pain clinic hasn't seen. The compound your GP can't prescribe. The results thousands of patients are reporting.

Physiotherapist
Reviewed by registered physiotherapists · Updated March 2026

The Protocol Problem

Patient in NHS waiting room

The NHS sciatica pathway has not changed in any meaningful way for over a decade. Patient presents. Paracetamol is prescribed. Keep mobile. Review in six weeks. If pain persists: MRI referral, eight-week wait. Disc herniation confirmed: pain clinic, fourteen-week wait. Epidural injection. Then another. Then a third.

Then, if you are still in pain — and most patients are — you end up in a physiotherapy clinic with a photocopied exercise sheet and a core strengthening programme.

One NHS physiotherapist described the look patients give when, after months of waiting, they're handed a photocopied exercise sheet. “That look haunted me,” he said.

The protocol is not wrong because the people following it are incompetent. It is wrong because it is built on an incomplete understanding of what sciatica actually is. The protocol treats the nerve. It does not treat the tissue surrounding the nerve.

A 2022 systematic review and meta-analysis published in the European Spine Journal (Dove et al.) found that physiotherapy interventions for sciatica produced inconsistent results, with many patients showing limited durable improvement at 12-month follow-up. A separate Cochrane-registered review of conservative management for lumbar radiculopathy concluded that exercise therapy alone shows limited long-term benefit when the underlying vascular and muscular components are not addressed.

This is not a criticism of the NHS. It is a description of where the science has moved — and where the clinical guidelines have not yet followed.

What The Research Found

Medical research paper on lumbar spine
Peer-reviewed research · Peripheral Nerve Ischemia

Research into the mechanism of sciatic nerve compression has consistently identified a vascular component that standard protocols do not address. Studies examining piriformis syndrome and deep gluteal space pathology have found that compression of the vasa nervorum — the small blood vessels supplying the sciatic nerve — is a primary driver of persistent symptoms in patients who do not respond to standard treatment.

When the muscles surrounding the sciatic nerve remain in a state of chronic contraction, they compress the microvascular network that delivers oxygen to the nerve tissue.

Ischemia means restricted blood supply. When muscles remain in a state of chronic contraction — from pain, from guarding, from compensatory movement patterns — they compress the microvascular network running through them. The blood stops flowing. The oxygen stops arriving.

"Ischemia of the vasa nervorum — the blood vessels supplying the nerve — produces pain indistinguishable from structural nerve compression. Addressing the vascular component is essential for durable relief."

— Peripheral nerve ischemia research, summarised in Muscle & Nerve

This explains a pattern that every pain clinic sees but few openly discuss: the diminishing returns of epidural injections. The first injection works. The second works less. The third barely touches it.

An epidural places a numbing agent around the nerve. It interrupts the pain signal. But it does nothing about the muscles that are compressing the blood vessels. The injection wears off. The ischemia remains. The nerve continues to starve. The pain returns — often worse, because the underlying cause has been left untouched for another six weeks.

A 2021 narrative review published in the International Journal of Environmental Research and Public Health (Carassiti et al.) noted that while epidural steroid injections provide short-term relief, symptom recurrence is common and well-documented in the literature. The review identified the absence of treatment targeting the muscular and vascular components as a key factor in poor long-term outcomes.

The Three Compounds

Magnesium, arnica and MSM ingredients

Once the mechanism is understood — ischemia, not nerve damage — the question becomes: what can address it? Not a numbing agent. Not a heating cream. Something that works at the cellular level to break the ischemic cycle.

The research points to three compounds, used in combination, delivered transdermally — directly through the skin into the muscle tissue where the problem lives.

Transdermal Magnesium
Muscle Release · Vascular Opening

Magnesium is the mineral your muscles require to release. It competes with calcium at the cellular level — when magnesium is present, muscle fibres cannot maintain their contracted state. They let go. The blood vessels they were compressing begin to open. Oxygen returns to the tissue.

Oral magnesium supplements are largely destroyed in the gut before reaching muscle tissue. Transdermal delivery bypasses this entirely — the compound absorbs directly through the skin into the underlying muscle.

Source: Magnesium Research, 2017 · European Journal of Nutrition, 2019

Arnica Montana
Inflammatory Drainage · Tissue Recovery

When tissue is oxygen-deprived, inflammatory metabolites accumulate. Lactic acid, cytokines, cellular waste products. This pooling of inflammatory material is part of what sustains the pain cycle even after the initial compression is addressed.

Arnica has been used in European clinical settings for over 200 years. A 2016 systematic review by Iannitti et al. published in the American Journal of Therapeutics — which drew on Cochrane-registered trial data — concluded that Arnica montana shows clinically meaningful effects for pain and inflammation in post-traumatic and post-surgical settings. It does not numb the area — it clears the waste that the returning blood flow needs to carry away.

Source: Iannitti et al., American Journal of Therapeutics, 2016 (Cochrane-registered trial data)

MSM (Methylsulfonylmethane)
Nerve Sheath Repair · Structural Support

Months of oxygen starvation damage the myelin sheath — the protective coating around the nerve fibre. This is why some patients continue to experience residual symptoms even after the ischemia is resolved. The nerve itself needs to recover.

MSM is an organic sulphur compound that provides the raw material for myelin repair. A double-blind trial published in Osteoarthritis and Cartilage found significant reduction in pain and functional limitation in patients receiving MSM supplementation over 12 weeks, compared to placebo. Separate research in Integrative Medicine Insights identified MSM's role in supporting connective tissue integrity, including the protective sheaths surrounding peripheral nerves.

Source: Osteoarthritis and Cartilage, 2006 · Integrative Medicine Insights, 2012

These three compounds are not new. Each has an independent body of research. What is relatively new is their combination in a single transdermal formulation — designed specifically to address the ischemic cycle, not to mask the pain signal.

What Patients Report

British woman writing at kitchen table

Not everyone had the same results. That is worth saying plainly. Some patients noticed changes within days. Others took two to three weeks. A small number did not notice significant improvement and returned the product under the 90-day guarantee.

The pattern that emerged, across thousands of users, was consistent with what the research would predict: the patients who had been through multiple injections with diminishing returns tended to respond most clearly. Their ischemic cycle was well-established. Addressing it produced a noticeable shift.

These are not dramatic testimonials. They are the kind of quiet, specific reports that tend to be more reliable than superlatives.

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