ArticleFrontiers in rehabilitation sciences2026
Redefining cerebral palsy: diagnostic boundaries based on the functional maturation of corticospinal motor control.
Article in Frontiers in rehabilitation sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: The 2006 international consensus defines cerebral palsy as a permanent disorder of movement and posture caused by non-progressive brain injury in the developing fetus or infant, yet it sets no upper age limit for the injury; in practice, countries adopt arbitrary chronological-age cut-offs, most commonly 24 months, without any neurobiological basis, and the 2025-2026 updated descriptions, although shifting toward a broader "description," retain the same temporal framework and provide no operational diagnostic boundary. Core hypothesis: The diagnostic essence of cerebral palsy lies not in the chronological age at injury but in whether the injury occurs before the functional maturation threshold of corticospinal motor-control integration in the corresponding functional domain, producing a persistent deviation of that domain's motor developmental trajectory; the gross-motor domain is marked by stable independent walking and the fine-motor domain by accurate pincer grasp as an exploratory extension. Theoretical framework: Stable independent walking is the behavioural read-out of the first functional integration of spinal central pattern generators, brainstem postural control, vestibulo-cerebellar integration, and cortical descending modulation, with the corticospinal system as the final common pathway, so the framework applies to all motor subtypes; a four-criterion scheme justifies marker selection, and a complete operational definition is provided with velocity- and pattern-deviation domains, domain-specific criteria, and a stepwise diagnostic algorithm. Testable inferences: Stratification by integrative-maturation status is predicted to outperform chronological-age stratification in forecasting motor outcomes, with explicit falsification criteria and a multicentre prospective validation roadmap. Conclusions: Replacing the chronological-age criterion with the integrative-maturation status of each functional domain resolves the longstanding diagnostic ambiguity between cerebral palsy and other static motor impairments; all quantitative thresholds are theoretical working benchmarks pending calibration by multicentre prospective cohort studies.
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