Cerebral Palsy Types: Spastic, Athetoid & Ataxic

Classification of Cerebral Palsy

Cerebral Palsy (CP) is a group of permanent movement disorders caused by non-progressive damage to the developing fetal or infant brain. Because the brain injury can occur in different locations, CP presents with diverse motor symptoms. Neurologists and physiotherapists classify CP into three major motor types, plus mixed forms, based on the primary movement abnormalities.

1. Spastic Cerebral Palsy (Hypertonic Type)

Spastic CP is the most prevalent form, accounting for approximately 75% to 80% of all cases. It is caused by damage to the motor cortex or the pyramidal tracts in the brain, which disrupt voluntary movement signals.

• Clinical Presentation: Elevated muscle tone (hypertonia), stiff muscles, hyperactive reflexes, and restricted joint range of motion. Muscles are constantly contracted, leading to typical gait patterns such as toe-walking or a "scissoring" gait.
• Topographical Subtypes:
• Spastic Diplegia: Affects primarily the legs, often related to premature birth.
• Spastic Hemiplegia: Affects one side of the body (arm usually more affected than leg).
• Spastic Quadriplegia: Affects all four limbs, the trunk, and often oral-motor muscles.
• Physiotherapy Focus: Muscle elongation/stretching to prevent joint contractures, dynamic splinting, gait training, and strengthening antagonist muscles to balance joint forces.

2. Athetoid (Dyskinetic) Cerebral Palsy

Athetoid CP is caused by damage to the basal ganglia, which are responsible for regulating involuntary movement and muscle tone transitions.

• Clinical Presentation: Fluctuating muscle tone (switching from floppy to stiff) and involuntary, slow, writhing movements of the limbs, trunk, and face. These movements increase with excitement or stress and disappear during sleep. Children may have difficulty with speech (dysarthria) and swallowing.
• Physiotherapy Focus: Proximal joint stabilization (building strong core and shoulder/hip stability), weight-bearing activities to normalize muscle tone, and using assistive devices to facilitate functional communication and independence.

3. Ataxic Cerebral Palsy

Ataxic CP is the least common type, accounting for about 5% of cases. It results from damage to the cerebellum, the brain's coordination and balance center.

• Clinical Presentation: Impaired balance, lack of coordination, shaky movements (intention tremors), and a wide-based, unsteady gait. Fine motor skills like writing or buttoning a shirt are highly challenging due to difficulty controlling force and distance of movements.
• Physiotherapy Focus: Balance training (using rocker boards and unstable surfaces), coordination drills, core stabilization, and using weighted orthotics or vests to enhance proprioception and stabilize movements.

Interdisciplinary Management & Early Intervention

Early diagnosis and immediate initiation of pediatric physiotherapy are critical to maximize neuroplasticity. Therapy programs are highly customized, often combining physical therapy, occupational therapy, and assistive technology. For children with severe spasticity, medical treatments like baclofen or botulinum toxin injections may be coordinated with therapy to optimize functional outcomes.

To learn more about specialists in this area, see our guide on finding the best cerebral palsy specialist in India or explore pediatric rehabilitation options.

References

• Bax M et al. Proposed definition and classification of cerebral palsy. Developmental Medicine & Child Neurology. 2005.
• Novak I et al. A systematic review of interventions for children with cerebral palsy: state of the evidence. Developmental Medicine & Child Neurology. 2013.
• Rosenbaum P et al. The definition and classification of cerebral palsy. Developmental Medicine & Child Neurology Supplement. 2007.