Repetitive transcranial magnetic stimulation (rTMS) in cerebral palsy

What rTMS is, and why it matters in cerebral palsy

Repetitive transcranial magnetic stimulation delivers brief, focused magnetic pulses through a coil placed on the scalp, generating small electrical currents in the underlying cortex and modulating cortical excitability for periods that outlast the stimulation itself. In paediatric cerebral palsy the interest in rTMS comes from a simple observation: traditional physiotherapy provides peripheral input, but the cortex of a child with CP often needs more than peripheral input alone to consolidate motor learning. rTMS is one way to amplify the cortical side of that conversation.

Brain plasticity is highest in childhood, and that gives rTMS more to work with in paediatric CP than in adult-onset neurological injury. The aim is not to replace physiotherapy but to make it more effective — by improving the excitability of the right cortical circuits at the right moment in a goal-directed rehabilitation block.

Subtype-specific targets — not one protocol fits all

Cerebral palsy is heterogeneous, and rTMS targets need to match the subtype. In spastic diplegia the primary motor cortex lower-limb area and supplementary motor area are usually the priority. In spastic hemiplegia, the contralateral primary motor cortex is targeted to restore the interhemispheric balance disturbed by early injury. In dyskinetic subtypes the basal ganglia-cortical circuits matter most; in ataxic CP the cerebellar-thalamic-cortical pathway is the relevant network. The GMFCS level — and the child's individual goals — drive the choice of target, frequency and intensity.

The strongest evidence — combined with intensive physiotherapy + action-observation training

A 12-week 2×2 factorial randomised controlled trial in school-age children (GMFCS I–III) compared four conditions: conventional rehabilitation alone, conventional + rTMS, conventional + action-observation training (AOT), and conventional + rTMS + AOT. The combined rTMS + AOT + conventional rehabilitation group reached a clinically meaningful gross-motor response rate around 87.5 per cent. The single-modality add-ons (rTMS alone or AOT alone) sat at 62.5 per cent and 68.75 per cent respectively. Conventional rehabilitation alone reached 25 per cent.

Two messages matter here. First, the combined approach was not a simple sum of its parts — it produced a multiplicative effect on gross-motor function and balance, with carry-over to participation in daily life. Second, conventional rehabilitation on its own, however well delivered, captured only a fraction of the achievable response in this trial. That observation is consistent with the broader literature on intensive, goal-directed paediatric neurorehabilitation.

Safety — what international guidelines say

rTMS is non-invasive: no surgery, no implant. In paediatric series and systematic reviews, when international safety guidelines are followed, serious adverse events are rare. The main reported side effects are mild and transient — local scalp discomfort, brief facial-muscle twitching during stimulation, mild headache, and the auditory click of the coil. The seizure risk is under 0.1 per cent when current paediatric safety protocols are followed, and children with a personal history of epilepsy are evaluated especially carefully before any rTMS is considered.

Standard safety considerations include screening for metal implants in the head and neck, adjusting stimulation intensity to age and head size, and using hearing protection during sessions. Sessions are short and tolerated well by most children, including younger children with attention difficulties.

Outcome measurement — what we track, and what we will not call success on impression

We measure response with the same scales we used at baseline, at structured intervals. Gross-motor function with GMFM-88, manual ability with MACS, communication with CFCS, eating and drinking with EDACS, spasticity with the modified Ashworth and Tardieu scales, and balance with the Pediatric Balance Scale. Where appropriate, neurophysiological parameters — motor-evoked potential threshold, cortical silent period, interhemispheric inhibition — give us prognostic and response information. Improvement is called improvement only when the numbers move alongside the family's lived experience.

Where rTMS does not fit

rTMS is not the right step for every child with cerebral palsy. We do not recommend it where there is severe global brain involvement with no realistic motor target, where an unresolved orthopaedic, epilepsy or feeding problem should come first, where the family's expectations cannot be met by current evidence, or where the regulatory framework around the proposed protocol is unclear. Saying "not yet" or "not for this child" is part of the same evidence-led care.

How an educational review can help

An educational review can pull together the current rTMS literature in paediatric cerebral palsy, frame the combined-approach evidence honestly, and prepare focused questions for your treating team — including whether rTMS as part of an intensive rehabilitation block could be considered for your child. It is educational and does not replace your treating clinician's care.