Frontiers in rehabilitation sciences · 2026
Redefining cerebral palsy: diagnostic boundaries based on the functional maturation of corticospinal motor control.
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Sun Huaifeng
Аннотация
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.
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.