EMTT Vs PEMF: What is the Best Fit for your Clinic?

Most MSK clinicians have a view on magnetic therapy, and it is usually a sceptical one. That is fair. The category is crowded with low-powered mats and handheld units making big promises on thin evidence.

So when the STORZ MEDICAL MAGNETOLITH® ultra+ gets filed under “PEMF”, it is worth asking whether the label fits. It doesn’t, quite. EMTT uses electromagnetic pulses, as PEMF does, but the signal differs in two ways that matter clinically: how fast the field oscillates, and how strong it gets.

Same family, different signal

PEMF is a broad term. It covers any device that drives current through a coil to produce a magnetic field that switches on and off. In clinical use the frequency is usually below 100 Hz, with field strengths between 0.1 and 30 mT, delivered as square, triangular or sawtooth waveforms.¹ That leaves a lot of room. A fracture-healing stimulator and a consumer wellness mat can both fairly call themselves PEMF.

EMTT sits at the high-energy end. Each pulse from the MAGNETOLITH® oscillates at 100 to 300 kHz, with a field strength of 80 mT, and pulses are delivered at up to 10 per second.² STORZ quotes a penetration depth of up to 18 cm.³ Rapidly alternating magnetic pulses induce small electrical currents in tissue, and cells convert that stimulus into a biological response.⁴

Head to head

What the evidence says

PEMF has decades of research behind it, going back to Bassett’s work in the 1970s.⁷ The difficulty is the spread. Studies use such different parameters that firm conclusions are hard to draw. A 2026 meta-analysis of PEMF in knee osteoarthritis found statistically significant improvements, but noted they may not reach the threshold for clinical meaningfulness, and that results depended on amplitude and frequency.⁸ In a randomised trial comparing shockwave, low-level laser and PEMF in knee OA, all three helped in the short term, though PEMF’s gains were the least pronounced.⁹

EMTT’s evidence base is younger, but it has been tested against sham, and it has grown steadily.

Side effects were minor: slight skin reddening and mild discomfort during treatment, reported more often with EMTT than with sham.¹¹

Bone and joint conditions

Osteo presentations are where EMTT’s research is most interesting for MSK clinics.

In the lab, EMTT has been shown to upregulate genes linked to bone formation and to accelerate matrix mineralisation,¹⁵ and to stimulate human bone marrow mesenchymal stem cells.¹⁶ PEMF has its own long history in delayed union and non-union fractures, osteoarthritis and osteoporosis,¹ and EMTT builds on that foundation at a much higher energy.

In the treatment room

The practicalities are where EMTT tends to win clinicians over. Sessions take 5 to 20 minutes depending on the indication and settings.² Patients don’t need to undress, which helps with comfort and privacy. Settings are adjusted on the touchscreen, and the unit moves between rooms on its integrated trolley.¹⁷

It also sits comfortably alongside shockwave. STORZ MEDICAL positions EMTT as a complement to ESWT, and combined use has been studied in rotator cuff tendinopathy.¹³ For clinics already running shockwave, EMTT adds a second option for the same patient groups: chronic tendinopathy, knee osteoarthritis and persistent low back pain.

As with any electromagnetic therapy, screen for active implanted devices such as pacemakers, and check the full contraindications in the instructions for use.

Where it fits