Cerebral Palsy
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Direct answer
Damage to the developing brain — antenatal, perinatal or within the first two to three years — produces cerebral palsy, a static disorder of posture, movement and tone presenting with delayed motor milestones and abnormal tone, often with epilepsy, intellectual disability, sensory and feeding problems. The motor types to classify are spastic (hemiplegia, diplegia, quadriplegia), dyskinetic (dystonia, choreoathetosis — kernicterus and hypoxic-ischaemic injury the classic causes), ataxic, hypotonic and mixed. Diagnosis is clinical, with magnetic resonance imaging defining the lesion in most. Management is multidisciplinary — early physiotherapy, spasticity reduction with botulinum toxin, baclofen and selective surgery, anticonvulsants, nutrition — with the Gross Motor Function Classification System grading severity.
What you must remember
- Definition to quote: permanent disorders of movement and posture from non-progressive disturbances in the developing brain, causing activity limitation, with frequent sensory, cognitive, communication and behavioural comorbidity and epilepsy; the lesion is static but the picture evolves — a non-progressive insult, not a non-progressive examination.
- Timing of insult: antenatal — malformations, congenital infections; perinatal — hypoxic-ischaemic encephalopathy, periventricular leukomalacia of prematurity; postnatal — kernicterus, meningitis including tuberculosis, trauma, stroke; India's postnatal-infection and kernicterus share remains high.
- Topographical-motor types: spastic hemiplegia (upper limb worse, walking achieved); spastic diplegia (the preterm-periventricular leukomalacia pattern, lower limbs worse with scissoring); spastic quadriplegia (most severe, with feeding compromise and the highest epilepsy rates); dyskinetic (kernicterus and term asphyxia — choreoathetosis, dystonia, often intact intellect trapped in an uncontrollable body).
- Early diagnostic signs in infancy: poor suck and head lag beyond expected, persistent fisting beyond three months, hand preference before one year (hemiplegia until disproved), scissoring on vertical suspension, exaggerated or absent reflexes, and abnormal general movements (absent fidgety movements at three months in high-risk infants on video assessment).
- Co-morbidities to actively screen: epilepsy (a third to half of severe cases), intellectual disability, speech disorder, sensorineural hearing loss (post-kernicterus), cortical visual impairment, oromotor dysfunction with aspiration and malnutrition, reflux, constipation, hip subluxation, scoliosis and osteopenia.
- GMFCS levels I-V: from independent walking (I) through walking with aids (II-III) to wheelchair mobility (IV) and total dependence (V) — the single best answer to "how will this child function", assigned before age two with caution.
- Spasticity ladder: physiotherapy (stretching, casting) plus botulinum toxin-A focal injection dosed by weight and muscle (effect lasting three to six months), oral baclofen or diazepam for generalized spasticity, intrathecal baclofen pumps, selective dorsal rhizotomy, and orthopaedic surgery (tendon lengthening, hip reconstruction) after age six to seven when tone patterns stabilise.
- Aetiology honesty for counselling: in many no cause is found despite imaging, and only a minority are attributable to intrapartum asphyxia alone — important for counselling and medicolegal reasoning.
How to work through it
Take a seven-month-old ex-29-weeker who cannot roll and holds legs stiffly in extension. Confirm tone and reflexes (hypertonic adductors, brisk reflexes, scissoring — spastic diplegia fitting the periventricular leukomalacia history), obtain magnetic resonance imaging, and screen vision, hearing, feeding and seizures. Then start the intervention engine: daily home physiotherapy, adaptive seating, oromotor guidance and scheduled hip surveillance. At two years assign the Gross Motor Function Classification System honestly, consider botulinum toxin for focal spasticity impeding gait training, and enrol the family into early-intervention and disability services.
The contrast case: a term infant after severe neonatal jaundice, now a two-year-old with tongue writhing and dystonic posturing but warm social engagement — kernicterus with dyskinetic cerebral palsy, often intact cognition, hearing screen mandatory, therapy directed at dystonia.
How the exam frames it
Classifications carry the marks: motor types and the cause-type pairings — preterm with diplegia, term asphyxia and kernicterus with dyskinetic forms, meningitis with quadriplegia and epilepsy. The second tier tests early-diagnosis signs and the Gross Motor Function Classification System grades. The Indian context: kernicterus from inadequate phototherapy or glucose-6-phosphate dehydrogenase-triggered jaundice remains a preventable dyskinetic-cerebral-palsy factory; post-meningitic disease justifies aggressive jaundice and infection management; and the Rashtriya Bal Swasthya Karyakram links screening to district early-intervention centres, with disability certification unlocking benefits — the practical answer to "what next after diagnosis".
Frequently asked questions
What defines cerebral palsy?
A permanent, non-progressive disorder of posture and movement from an insult to the developing brain, with motor delay plus tone and reflex abnormalities, frequently accompanied by epilepsy, sensory, cognitive and communication impairments.
Which motor pattern is typical of a preterm infant with periventricular leukomalacia?
Spastic diplegia — lower-limb-predominant hypertonia with scissoring gait, the upper limbs relatively spared — reflecting the topography of the prematurity-related white matter injury.
What is the Gross Motor Function Classification System?
A five-level scale from independent ambulation (I) to full wheelchair dependence (V) that grades motor severity, guides prognosis and frames therapy goals across age bands.
When is botulinum toxin used in cerebral palsy?
For focal spasticity interfering with function or care — typically calf, hamstring or adductor tone — injected at two-to-six monthly intervals alongside therapy, in children usually above two to four years of age.
Why does dyskinetic cerebral palsy follow kernicterus?
Bilirubin deposits in the basal ganglia and auditory pathways, producing dystonia and choreoathetosis with sensorineural deafness, often with preserved intellect — a largely preventable pattern with timely neonatal jaundice management.