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Plastic changes in brainstem reticular formation may be involved in spasticity onset across stroke and spinal cord injuryCould brainstem plastic changes trigger spasticity in stroke and spinal cord injury patients?

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Key Takeaway
Note that plastic changes in brainstem reticular formation may be involved in spasticity onset, but evidence remains limited and controversial.

This systematic review investigated pathophysiological similarities and differences in spasticity between stroke and spinal cord injury, incorporating recent studies on plastic changes in the brainstem reticular formation. The population included humans, primates, and rodents. No specific comparator was reported, and the sample size was not reported. The setting was not reported, and follow-up duration was not reported.

The main finding indicates that plastic changes in the brainstem reticular formation may be involved in the onset of spasticity. However, the review notes that definitive studies on the underlying pathophysiology have not been reported. Consequently, the evidence remains limited and controversial regarding the extent of this involvement.

Safety and tolerability data were not reported, as adverse events, serious adverse events, discontinuations, and general tolerability were not reported. Key limitations include the lack of definitive studies on the underlying pathophysiology and the fact that evidence remains limited and controversial. Funding or conflicts of interest were not reported. Practice relevance was not reported. While increasing numbers of studies suggest a potential role for these plastic changes, the current data do not support definitive clinical conclusions.

Spasticity is a frustrating reality for many people recovering from strokes, spinal cord injuries, or cerebral palsy. It feels like muscles are locked tight, making movement difficult and often painful. While doctors have long studied the brain, recent attention has turned to the brainstem reticular formation, a deep part of the brain that helps control muscle tone. Some studies in humans, primates, and rodents suggest that plastic changes here might be involved in causing spasticity to start.

But here is the catch: the evidence is not settled. Reviews of the data show that findings remain limited and controversial. We simply do not have definitive studies yet that explain the exact pathophysiology, or the physical disease process, behind this condition. Without clear proof, we cannot say for sure that these brain changes are the main driver for everyone.

This uncertainty is important for patients and families. It means that while this new angle is interesting, it is not ready to replace current treatments. Until more research clarifies the picture, medical advice must remain grounded in what we know for certain. We must wait for better data before making big changes to care plans.

What this means for you:
Plastic brainstem changes may cause spasticity, but evidence is limited and controversial.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedMar 2026
View Original Abstract ↓
Spasticity occurs due to central nervous system (CNS) injuries such as stroke, spinal cord injury, cerebral palsy, or multiple sclerosis. Following CNS injury, spasticity does not appear immediately but emerges several days to weeks later and is believed to be the result of maladaptive changes due to neuroplastic alterations. Previously, research on the pathophysiology of spasticity has primarily focused on the spinal cord, leading to the elucidation of its mechanisms. Although the involvement of upper motor neurons has been suggested, definitive studies on the underlying pathophysiology have not been reported. In recent years, brainstem reticular formation has been identified as a region undergoing active plastic changes following a CNS injury. Although evidence remains limited and controversial, increasing numbers of studies suggest that plastic changes in brainstem reticular formation may be involved in the onset of spasticity. This review outlines the pathophysiological similarities and differences in spasticity between stroke and spinal cord injury, while summarizing recent studies on plastic changes in brainstem reticular formation and the onset of spasticity, including studies of humans and primates, as well as rodents. It organizes and examines the points of contention regarding the differences in outcomes between these two groups.
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