Cerebral palsy (CP) is a leading cause of permanent motor disability in children, resulting from non-progressive disturbances to the developing brain. Prematurity and low birth weight are major risk factors, with infants under 1500 g having a markedly higher risk. Spastic CP is the most common subtype, and spastic diplegia accounts for 30-40% of cases, primarily affecting the lower limbs and trunk control. CP prevalence has declined in high-income countries but remains higher in low- and middle-income regions, including Pakistan. Beyond clinical challenges, CP imposes a substantial lifelong economic burden. Current management follows the ICF framework, emphasizing function, participation, and independence. Traditional approaches such as the Bobath method show limited evidence compared with task-oriented therapies. Dynamic Movement Intervention (DMI) is a neuroplasticity-based, task-oriented approach emphasizing repetitive functional activities. Trunk-focused dynamic training has shown superior improvements in balance and gross motor function. However, comparative evidence between DMI and Bobath therapy in young children is limited, necessitating further research using validated outcome measures.

Cerebral palsy (CP) is a major cause of permanent motor disability in childhood and is defined as a group of non-progressive disorders affecting movement and posture due to disturbances in the developing fetal or infant brain. Its etiology is multifactorial, with prematurity and low birth weight identified as the strongest risk factors. Population-based European studies indicate that infants weighing less than 1500 g at birth have up to a 70-fold greater risk of developing CP compared with those born weighing over 2500 g.

Spastic CP is the most prevalent subtype, with spastic diplegia accounting for approximately 30-40% of cases. This subtype primarily affects the lower extremities and is characterized by increased muscle tone, poor trunk control, and persistent limitations in functional mobility. Clinical presentation varies from isolated motor deficits in focal brain injury to complex impairments involving sensory, cognitive, communicative, and behavioral domains when brain involvement is extensive.

Recent meta-analyses report a decline in CP prevalence in high-income countries to approximately 1.6 per 1,000 live births, whereas substantially higher rates, up to 3.4 per 1,000 live births, persist in low- and middle-income countries. In Pakistan, regional data from Khyber Pakhtunkhwa report a prevalence of 1.22 per 1,000 live births, with a male predominance. Beyond clinical impact, CP imposes a considerable economic burden, with estimated lifetime costs exceeding USD 860,000 per affected individual.

Current CP management aligns with the International Classification of Functioning, Disability, and Health (ICF) framework, emphasizing activity, participation, and functional independence. Although early intervention benefits cognitive outcomes, sustained improvements in motor function remain inconsistent. Traditional neurodevelopmental approaches, particularly the Bobath method, focus on tone regulation and movement facilitation; however, systematic reviews indicate limited evidence supporting their superiority over task-oriented therapies. Consequently, contemporary guidelines advocate for evidence-based, goal-directed interventions that yield meaningful functional outcomes.

Dynamic Movement Intervention (DMI) is a task-based therapeutic approach grounded in neuroplasticity principles, emphasizing repetitive, progressive, and functionally relevant activities. Given the proximal-to-distal pattern of motor development, trunk control is fundamental for balance, coordination, and mobility. Evidence suggests that trunk-focused training on dynamic surfaces enhances postural control, sensory integration, and gross motor function more effectively than static surface exercises. Task-oriented training further promotes motor learning through repetition of meaningful activities, facilitating adaptive reorganization of motor pathways.

Randomized trials and systematic reviews support the effectiveness of trunk-targeted and task-oriented interventions in improving trunk stability, balance, and gross motor function in children with CP. However, direct comparisons between DMI and the Bobath approach remain limited, particularly in young children with spastic diplegic CP. Moreover, the Trunk Impairment Scale (TIS), a validated predictor of functional mobility, has been underutilized as a primary outcome measure. This study aims to address these gaps by comparing the effects of DMI and Bobath therapy on neuromuscular development in children aged 2-4 years with spastic diplegic CP using validated outcome measures, including the GMFM-88, SSDT, and TIS.

Inclusion Criteria:

• Diagnosed with spastic diplegic cerebral palsy.
• Gross Motor Function Measurement Scale (GMFC) level I to III.
• Children who have head control.
• Ability to understand and follow simple instructions.

Exclusion Criteria:

• Visual or hearing impairments (e.g., cataract, myopia, deafness).
• Cognitive problems impacting participation.
• Uncontrolled convulsions or recent seizure activity.
• Orthopedic surgeries of the lower limbs, such as dorsal rhizotomy within the last year.