Cerebral Palsy: Case Discussion & Key Points
Model Case Presentation
Patient Demographics
Name: Master Arjun, Age: 2 years, Gender: Male, Informant: Mother (Reliable)
Chief Complaints
- Not walking – till date
- Not standing without support – till date
- Delayed speech – not yet saying meaningful words
- Stiffness of both legs since 6 months of age
History Summary
Baby was born at 30 weeks gestation (preterm) by emergency LSCS for fetal distress. Birth weight was 1.2 kg. Cried after resuscitation (Apgar 4/10 at 1 min, 7/10 at 5 min). Required NICU admission for 6 weeks — needed ventilatory support for 10 days. Mother noticed that baby's legs were "stiff like a board" and crossed like scissors when held upright by 6 months. Baby never crawled. Currently, baby takes support to sit and cannot stand or walk. Has not said any meaningful words. Eats semisolid food but drools excessively.
No history of seizures. No regression of milestones. Non-consanguineous marriage. No family history of neurological disease. No jaundice in neonatal period.
⚠️ Key Risk Factors Identified
Extreme prematurity (30 weeks) + Low birth weight (1.2 kg) + Perinatal asphyxia + Mechanical ventilation → High risk for Periventricular Leukomalacia (PVL) → Spastic Diplegia
Examination Summary
| Parameter | Finding | Significance |
|---|---|---|
| Motor milestones | None achieved age-appropriately | Global motor delay |
| Head circumference | 43 cm (microcephaly) | Suggests brain insult |
| Tone (lower limbs) | Spastic (clasp-knife) | UMN lesion |
| Deep tendon reflexes | 3+ at knee and ankle; clonus present | UMN lesion |
| Plantar response | Extensor (Babinski positive) | Pyramidal tract involvement |
| Primitive reflexes | Moro and ATNR still present | Persistence beyond normal age |
| Posture | Scissoring of legs, equinus posture of feet | Spastic diplegia pattern |
| Upper limbs | Mildly affected (clumsiness) | Predominantly lower limb involvement |
| Cranial nerves | Normal | — |
| Vision/Hearing | Clinically intact | — |
Postural reactions: Parachute reflex absent. Righting reactions delayed.
✅ Complete Diagnosis
Cerebral Palsy — Spastic Diplegia (GMFCS Level IV), secondary to Periventricular Leukomalacia following Extreme Prematurity with Perinatal Asphyxia. With associated speech delay and microcephaly.
📝 History — Exam Q&A
Cerebral Palsy (CP) is a group of permanent, non-progressive disorders of movement and posture, causing activity limitation, that are attributed to non-progressive disturbances occurring in the developing fetal or infant brain (before 2 years of age).
💡 Key Points in Definition
- Non-progressive brain lesion — but clinical manifestations evolve with age
- Motor disorder is primary — sensory, cognitive, communication disorders may coexist
- Before age 2 years — similar motor deficits after 2 years are NOT called CP
- It is a symptom complex / descriptive term, not a specific disease
Approximately 2–3 per 1000 live births. CP is the most common cause of childhood physical disability. Prevalence is significantly higher in preterm infants — up to 70–111 per 1000 live births in very preterm or very low birth weight neonates.
| Period | Risk Factors |
|---|---|
| Pre-conception | Advanced maternal age, infertility treatments (multiple gestation) |
| Prenatal | Prematurity, IUGR, multiple gestation (twins), congenital infections (TORCH — especially CMV, rubella), maternal thrombophilia, placental insufficiency, brain malformations, fetal stroke, maternal diabetes, thyroid disorders |
| Perinatal | Perinatal asphyxia/HIE, birth trauma, prolonged labor, cord prolapse, neonatal hypoglycemia, kernicterus (severe hyperbilirubinemia) |
| Postnatal | Meningitis/encephalitis, head trauma, near-drowning, intracranial hemorrhage (before 2 years) |
💡 Most Important Risk Factor
Prematurity (especially <32 weeks) + Low birth weight is the single most significant risk factor for CP.
1. Perinatal history: Gestational age, birth weight, mode of delivery, Apgar score, NICU admission, ventilatory support, neonatal seizures, jaundice requiring exchange transfusion.
2. Developmental history: Age at which each milestone was achieved — head control, sitting, standing, walking, social smile, speech. Identify the specific milestone(s) delayed. Ask if any skills were lost (regression would suggest a progressive disorder, not CP).
3. Associated symptoms: Seizures, visual/hearing problems, feeding difficulty (drooling, aspiration), behavioral issues, cognitive delay.
4. Antenatal: Infections (TORCH), drugs, maternal illness.
5. Family history: Progressive neurological disease in siblings (to rule out hereditary conditions).
| Type | Frequency | Lesion Site | Key Feature |
|---|---|---|---|
| Spastic | ~80% (most common) | Cortex / pyramidal tracts | Increased tone (clasp-knife), hyperreflexia, Babinski positive |
| Dyskinetic (Athetoid/Dystonic) | ~10–15% | Basal ganglia | Involuntary, writhing/twisting movements; fluctuating tone; disappear in sleep |
| Ataxic | ~5% (least common) | Cerebellum | Incoordination, hypotonia, intention tremor, wide-based gait |
| Mixed | Common | Multiple sites | Combination of above (most often spastic + dyskinetic) |
| Type | Limbs Involved | Common Cause | Prognosis for Walking |
|---|---|---|---|
| Hemiplegia | One side (arm > leg) | Unilateral brain injury, stroke, porencephaly | Good — most walk |
| Diplegia | Both legs (legs >> arms) | Prematurity, PVL | Good — most walk with aids |
| Quadriplegia | All 4 limbs (arms ≥ legs) | Severe HIE, diffuse brain injury | Poor — most need wheelchair |
| Monoplegia | One limb only | Rare | Good |
| Triplegia | Three limbs | Asymmetric quadriplegia | Variable |
💡 Remember
Spastic diplegia is the hallmark of prematurity. Spastic quadriplegia is associated with severe perinatal asphyxia at term. Dyskinetic CP classically follows kernicterus (bilirubin encephalopathy) or severe term asphyxia.
- Hand preference before 12–18 months — suggests hemiplegia
- Scissoring of legs when held upright — spasticity of adductors
- Poor head control beyond 3–4 months
- Persistent fisting beyond 3 months
- Not sitting by 9–12 months
- Tip-toe walking in toddlers (equinus posture)
- Persistent primitive reflexes beyond their normal disappearance age
- Absence of postural reactions (parachute reflex absent beyond 9 months)
- Hypotonia in infancy converting to hypertonia later
| Domain | Associated Conditions | Frequency |
|---|---|---|
| Cognitive | Intellectual disability | ~50% |
| Epilepsy | Seizure disorder | ~25–35% |
| Communication | Speech & language delay, dysarthria | ~30–50% |
| Sensory | Visual impairment, strabismus, hearing loss | ~20–30% |
| GI/Nutrition | Dysphagia, GERD, constipation, malnutrition | Common |
| Musculoskeletal | Hip subluxation/dislocation, scoliosis, contractures | Common |
| Behavioral | ADHD, autism spectrum, anxiety | ~25% |
| Other | Sialorrhea (drooling), urinary incontinence, pain | Common |
Non-regression of milestones. In CP, the brain lesion is static — the child does NOT lose already-acquired skills. Development is delayed but not regressive.
If a child previously achieved milestones and then loses them (e.g., walks then stops, or speech regresses), it suggests a progressive neurological disorder (metabolic, neurodegenerative) and CP must be reconsidered.
🩺 Examination — Exam Q&A
1. General: Head circumference (micro/macrocephaly), nutritional status, dysmorphic features, skin (neurocutaneous stigmata).
2. Observation of posture and spontaneous movement: Resting posture, asymmetry, involuntary movements, fisting, scissoring.
3. Tone assessment: Passive range of motion, resistance to movement, popliteal angle, adductor angle, scarf sign (in infants).
4. Power/Strength: Evaluate voluntary movements against gravity.
5. Deep Tendon Reflexes (DTRs): Knee jerk, ankle jerk — look for hyperreflexia and clonus (UMN).
6. Plantar response: Babinski sign (extensor = UMN).
7. Primitive reflexes: Check for persistence (Moro, ATNR, palmar grasp).
8. Postural reactions: Parachute reflex, righting reactions — delayed emergence = abnormal.
9. Cranial nerves: Visual fixation/following, extraocular movements, facial symmetry, tongue movements (dysarthria).
10. Cerebellar signs: If ataxic type — finger-nose, heel-shin, dysdiadochokinesis, gait.
11. Developmental assessment: Gross and fine motor, language, social milestones.
| Feature | Spasticity | Rigidity |
|---|---|---|
| Type | Velocity-dependent resistance (clasp-knife) | Velocity-independent (lead-pipe or cogwheel) |
| Reflex arc | Stretch reflex exaggerated | Normal stretch reflex |
| DTRs | Hyperreflexia | Normal or increased |
| Cause | Pyramidal (corticospinal) tract lesion | Extrapyramidal (basal ganglia) lesion |
| Distribution | Affects antigravity muscles preferentially | Affects all muscle groups equally |
| Clonus | Present | Absent |
💡 Clasp-Knife Spasticity
When you passively extend a spastic limb, there is initial resistance which suddenly gives way — like a penknife closing. This is characteristic of spasticity.
| Primitive Reflex | Normal Disappearance | Significance if Persists |
|---|---|---|
| Moro reflex | By 4–6 months | Suggests UMN pathology; predicts CP if retained |
| Asymmetric Tonic Neck Reflex (ATNR) — "Fencer posture" | By 4–6 months | Persistence beyond 6 months strongly predictive of CP |
| Symmetric Tonic Neck Reflex (STNR) | By 8–11 months | Interferes with crawling and independent sitting |
| Tonic Labyrinthine Reflex (TLR) | By 6 months | Causes extensor posturing in supine |
| Palmar grasp | By 4–6 months | Persistence = UMN dysfunction |
| Plantar grasp | By 9–15 months | Delays standing and walking |
| Galant reflex | By 4–6 months | — |
🚨 Key Exam Point
Presence of 5 or more abnormal primitive reflexes or postural reactions correlates strongly with the development of Cerebral Palsy.
Postural reactions are protective reflexes that emerge with maturation of the CNS and help maintain balance. Unlike primitive reflexes (which disappear), postural reactions should emerge and persist.
| Reaction | Normal Emergence | How to Test |
|---|---|---|
| Parachute reflex | 6–9 months | Hold baby horizontally and tilt head-down → arms extend protectively. ABSENT in CP (protective reaction fails) |
| Righting reactions | 4–6 months | Tendency to align head upright when tilted |
| Equilibrium reactions | 6–12 months | Balance adjustments when tilted on a tilting board |
Significance: Delayed emergence or absence of postural reactions = delayed CNS maturation → CP. The parachute reflex is the most clinically tested one.
GMFCS (Palisano et al., 1997; expanded 2007) is a 5-level ordinal scale that describes the gross motor function of children with CP based on their self-initiated movement abilities (sitting, walking, wheeled mobility). It reflects what the child typically does, not their best performance.
| Level | Ability | Mobility Aid |
|---|---|---|
| I | Walks without limitations; may have decreased speed/balance | None |
| II | Walks with limitations (stairs need railing; difficulty on uneven surfaces) | None routinely; may use for long distances |
| III | Walks using a hand-held mobility device (walker/crutches) indoors; may use wheelchair outdoors | Walker / forearm crutches |
| IV | Self-mobility limited; transported in manual wheelchair or uses powered mobility | Wheelchair (manual/powered) |
| V | Severely limited; cannot sit independently; transported by others | Power wheelchair; total assistance |
💡 Prognostic Value
GMFCS level is stable after 2 years of age. Children who sit independently by 24 months and crawl by 30 months are likely to achieve walking. Children who fail to achieve head balance by 20 months, or do not crawl by 5 years, are unlikely to walk independently.
| System | Acronym | What It Measures | Levels |
|---|---|---|---|
| Gross Motor Function Classification System (Expanded & Revised) | GMFCS-E&R | Mobility (sitting, walking, wheelchair) | I–V |
| Manual Ability Classification System | MACS | Hand use in daily activities (4–18 yrs) | I–V |
| Communication Function Classification System | CFCS | Communication effectiveness (sender & receiver) | I–V |
| Eating and Drinking Ability Classification System | EDACS | Swallowing safety and efficiency | I–V |
All four systems use Level I (most able) to Level V (most limited). They are complementary and together provide a comprehensive functional profile of the child.
| Gait Pattern | CP Type | Description |
|---|---|---|
| Scissor gait | Spastic diplegia/quadriplegia | Adductor spasticity → thighs cross each other with each step |
| Equinus gait (toe-walking) | Spastic hemiplegia/diplegia | Gastrocnemius spasticity → walking on tiptoes |
| Hemiplegic gait (circumduction) | Spastic hemiplegia | Affected leg swings outward in a semicircle (circumduction) |
| Crouched gait | Spastic diplegia | Hip and knee flexion with dorsiflexion at ankle |
| Ataxic gait | Ataxic CP | Wide-based, unsteady, staggering gait |
| Dystonic gait | Dyskinetic CP | Twisting postures, variable speed, worsened by intention |
- Hip subluxation / dislocation — Due to adductor/flexor spasticity (particularly in GMFCS IV–V); screened by Reimers' migration index on X-ray
- Equinus deformity — Tight gastrocnemius-soleus; toe-walking
- Pes planus (flat foot)
- Scoliosis — Especially in quadriplegia; worsens with severity
- Pelvic obliquity — Due to asymmetric spasticity
- Upper limb: Flexed wrist/elbow, thumb-in-palm deformity
- Bone mineral deficiency — Due to limited weight-bearing
🔬 Investigations — Exam Q&A
Yes, CP is primarily a clinical diagnosis based on history and neurological examination. Investigations are performed to:
- Identify the etiology and structural brain abnormality
- Rule out treatable/progressive conditions that mimic CP (e.g., metabolic disorders)
- Identify and manage associated conditions (epilepsy, hearing loss, etc.)
- Guide prognosis and management
MRI brain is the preferred and gold standard imaging modality. It is abnormal in ~80–90% of children with CP.
| CP Type / Etiology | MRI Finding |
|---|---|
| Spastic diplegia (Prematurity) | Periventricular Leukomalacia (PVL) — periventricular white matter loss, thinning of corpus callosum, pseudocolpocephaly (posterior horn dilatation) |
| Spastic hemiplegia (Term asphyxia) | Focal cortical/subcortical infarct, porencephaly |
| Spastic quadriplegia (Severe term HIE) | Diffuse cortical injury, parasagittal watershed infarct, cystic encephalomalacia, cortical atrophy |
| Dyskinetic CP (Kernicterus) | T2 hyperintensity in basal ganglia and thalami (globus pallidus), substantia nigra |
| Dyskinetic CP (Asphyxia) | Basal ganglia + thalamic injury |
| Ataxic CP | Cerebellar hypoplasia or cortical atrophy |
| Brain malformation | Polymicrogyria, pachygyria, schizencephaly, lissencephaly |
💡 Why MRI over CT?
MRI provides superior soft tissue contrast, better detects white matter injury (PVL), avoids radiation, and is more sensitive for cortical malformations. CT is used only when MRI is not available or contraindicated.
PVL is ischemic necrosis of periventricular white matter, the most common brain injury in premature infants. It results from the vulnerability of pre-oligodendrocytes (present in the preterm brain) to hypoxia-ischemia and free radical injury.
Why spastic diplegia? The corticospinal tract fibers controlling lower limb function run closest to the ventricles (in the periventricular white matter) — these are disproportionately affected by PVL. Upper limb fibers run more laterally and are relatively spared — hence, legs > arms (diplegia).
| Investigation | Purpose |
|---|---|
| EEG | If seizures — characterize epilepsy type, guide anti-epileptic therapy |
| Ophthalmological evaluation | Screen for strabismus, refractive errors, cortical visual impairment |
| Hearing assessment (ABR/BERA) | Especially in dyskinetic CP (kernicterus-related sensorineural hearing loss) |
| Metabolic workup (if no clear etiology) | Serum lactate, ammonia, amino acids, urine organic acids — to rule out treatable metabolic disorders |
| Genetic testing (Chromosomal microarray, WES) | If dysmorphic features, family history, or atypical presentation |
| Pelvic X-ray | Screening for hip subluxation (Reimers' migration index) — done 6-monthly in GMFCS III–V |
| DEXA scan | Bone mineral density assessment (especially in GMFCS IV–V, non-ambulant children) |
| Videofluoroscopic swallow study | If aspiration is suspected (poor feeding, recurrent chest infections) |
| Gait analysis (3D computerized) | Pre-operative planning for orthopaedic surgeries |
Always consider mimics when there is:
- No identifiable perinatal risk factor
- Normal MRI brain
- Progressive neurological decline or loss of milestones
- Family history of neurological disease
- Biochemical abnormalities
- Dysmorphic features or multi-organ involvement
Important treatable mimics of CP: Dopa-responsive dystonia (DRD) — excellent response to levodopa; Glutaric aciduria type 1; Biotinidase deficiency; Arginase deficiency; Spastic paraplegia (hereditary).
🚨 Exam Pearl
A child with dystonia and diurnal variation (worse in evening, better in morning) should always be given a therapeutic trial of Levodopa to exclude Dopa-Responsive Dystonia before diagnosing CP.
💊 Management — Exam Q&A
CP has no cure. Management is multidisciplinary, goal-directed, and aimed at:
- Maximizing functional independence and quality of life
- Preventing and treating complications (contractures, hip dislocation)
- Managing associated conditions (epilepsy, nutrition, communication)
- Supporting the family
Team members: Developmental pediatrician / Neurologist, Physiotherapist, Occupational therapist, Speech-language pathologist, Orthopedic surgeon, Ophthalmologist, Audiologist, Nutritionist, Social worker, Psychologist.
- Neurodevelopmental therapy (NDT/Bobath): Facilitates normal movement patterns, inhibits abnormal reflexes
- Passive stretching: Prevents contracture formation
- Strengthening exercises: Improve functional ability (contrary to old belief, strengthening does NOT worsen spasticity)
- Gait training: Treadmill training, constraint-induced movement therapy (CIMT) — especially for hemiplegia
- Hydrotherapy: Reduces spasticity in warm water
- Postural management: Lying, sitting, and standing postures to prevent deformity
Start early — neuroplasticity is greatest in the first 2 years of life.
| Orthosis | Indication |
|---|---|
| Ankle-Foot Orthosis (AFO) | Most common; corrects equinus deformity, improves gait |
| Hand splints | Spastic hemiplegia — prevents wrist flexion contracture |
| Hip abduction orthosis | Hip subluxation prevention in GMFCS III–V |
| Spinal orthosis (TLSO) | Scoliosis management in non-ambulant children |
| Standing frames / Standers | Weight-bearing; improves bone density, hip joint development, prevents contractures |
| Drug | Mechanism | Use / Notes |
|---|---|---|
| Baclofen (oral) | GABA-B agonist; reduces presynaptic excitatory neurotransmitter release at spinal level | First-line for generalized spasticity; limited by CNS side effects (sedation, hypotonia) at effective doses |
| Diazepam | GABA-A agonist; CNS depression | Short-term; useful in acute spasm; highly sedating |
| Tizanidine | Alpha-2 agonist; reduces motor neuron excitability | Alternative to baclofen; less weakness |
| Dantrolene | Reduces calcium release from sarcoplasmic reticulum → decreases muscle contraction | Peripheral muscle relaxant; causes liver toxicity — monitor LFTs |
| Trihexyphenidyl (Artane) | Anticholinergic | Used in dyskinetic/dystonic CP |
| Levodopa-carbidopa | Dopaminergic | Dopa-responsive dystonia; trial to exclude DRD |
Botulinum Toxin A (e.g., Dysport, Botox) is injected directly into spastic muscles. It blocks the release of acetylcholine at the neuromuscular junction → temporary chemical denervation → reduced muscle spasticity.
Indications:
- Focal (localized) spasticity — e.g., equinus due to gastrocnemius, adductor spasticity causing scissoring
- Delay contracture formation
- Improve gait and orthosis fitting
- Facilitate physiotherapy
- Enhance effect of serial casting
Age: Generally from 2 years (FDA approved for lower limb spasticity ≥2 years).
Duration of effect: Typically 3–6 months. Repeated injections needed.
Limitation: Not ideal for generalized spasticity (multiple large muscles). FDA black box warning: risk of systemic spread causing dysphagia/respiratory failure.
An implanted programmable pump delivers baclofen directly into the intrathecal (subarachnoid) space, providing higher concentrations at the spinal cord with far fewer systemic side effects compared to oral baclofen.
Indications:
- Severe, generalized spasticity not controlled by oral medications or BoNT-A
- Non-ambulant children (GMFCS IV–V) — improves ease of care, comfort, sitting
- Prior positive response to intrathecal test dose
Complications: Pump failure, catheter malposition, infection, CSF leak, baclofen overdose (coma, respiratory depression) or withdrawal (life-threatening seizures, hyperthermia).
Requires monthly clinic visits for pump refills.
SDR is a neurosurgical procedure in which 70–90% of dorsal (sensory) nerve rootlets at L1–S2 are selectively divided. By cutting the Ia afferent fibers, the hyperactive stretch reflex arc is interrupted → permanent reduction in spasticity.
Ideal candidate criteria:
- Spastic diplegia (best indication)
- GMFCS Level II or III (ambulant children)
- Age 3–10 years (optimal window)
- Good trunk control and lower limb strength (weakness unmasked after spasticity reduction)
- PVL on MRI (without basal ganglia involvement)
- Normal or near-normal intelligence
- Able to participate in intensive physiotherapy post-operatively
Benefits: Long-lasting spasticity reduction, improved gait. Risks: Weakness, sensory loss, bladder dysfunction, scoliosis.
| Procedure | Indication |
|---|---|
| Tendon lengthening (e.g., Achilles tendon lengthening) | Fixed equinus contracture |
| Adductor tenotomy / obturator neurectomy | Hip adductor spasticity; prevents/treats hip subluxation |
| Hip reconstruction (varus derotation osteotomy) | Hip subluxation / dislocation |
| Spinal fusion | Severe progressive scoliosis |
| Single Event Multi-Level Surgery (SEMLS) | Address multiple contractures in one surgical episode under one anesthetic; planned using 3D gait analysis |
💡 SEMLS
Single Event Multi-Level Surgery is now the preferred approach in ambulant CP children — corrects all lower limb deformities in one sitting to avoid multiple hospital admissions. Requires 3D gait analysis for planning.
- Oral motor therapy: Speech therapist — oromotor exercises
- Anticholinergic drugs: Glycopyrrolate (oral/transdermal), Hyoscine (scopolamine) patch — reduce saliva production
- Botulinum toxin injection into salivary glands (parotid ± submandibular) — 3–6 months duration
- Surgical options: Salivary duct ligation, submandibular duct relocation (severe, refractory cases)
Good prognostic indicators for independent walking:
- Sitting independently by 24 months
- Crawling by 30 months
- Hemiplegia or diplegia (vs. quadriplegia)
- Lower GMFCS levels (I–III)
Poor prognostic indicators for walking:
- No head balance by 20 months
- Persistent primitive reflexes beyond 24 months
- No postural reactions by 24 months
- Not crawling by 5 years
- Spastic quadriplegia, GMFCS IV–V
💡 Walking Prognosis by Type
Hemiplegia: ~90% walk independently. Diplegia: ~70% walk with/without aids. Quadriplegia: ~30% walk (many with aids). Dyskinetic CP: ~50–60% become ambulant.
🔭 Recent Advances — Exam Q&A
CP can now be diagnosed with high accuracy before 6 months of corrected age using a combination of validated tools:
- General Movements Assessment (GMA): Video analysis of spontaneous movements (Prechtl method). Absent fidgety movements (9–20 weeks post-term) have >98% sensitivity for CP.
- MRI brain in neonatal period / infancy
- Hammersmith Infant Neurological Examination (HINE)
- Neonatal neurological examination (Hammersmith Neonatal Neurological Exam — HNNE)
Why early diagnosis matters: Neuroplasticity is highest in infancy. Earlier referral for physiotherapy, occupational therapy, and family support improves long-term outcomes. Avoids diagnostic odyssey for families.
CIMT is used specifically in unilateral (hemiplegic) CP. The unaffected (stronger) hand is restrained using a cast or glove for 4–8 hours per day, forcing the child to use the affected hand intensively during that period.
Evidence: Good evidence for improvements in upper limb function. Modified CIMT (mCIMT) uses shorter restraint periods with bimanual task training (Hand-Arm Bimanual Intensive Training — HABIT).
Mechanism: Exploits neuroplasticity — intensive use promotes reorganization of cortical motor maps.
- Robotic-assisted gait training (RAGT): Lokomat — exoskeleton-assisted treadmill training; provides consistent, repetitive gait pattern; shows improvement in ambulant CP children
- Functional Electrical Stimulation (FES): Electrical stimulation of weak muscles during functional tasks (e.g., foot drop) — activates antagonist muscles to overcome spasticity
- Transcranial Magnetic Stimulation (TMS) and Transcranial Direct Current Stimulation (tDCS): Non-invasive brain stimulation; modulating cortical excitability; experimental in CP
- Virtual reality and gaming: Improves engagement and motivation for therapy; evidence for upper limb and balance training
- Augmentative and Alternative Communication (AAC): Eye-gaze technology, speech generating devices — for non-verbal children with CP
DBS involves implanting electrodes into the globus pallidus internus (GPi) with continuous high-frequency electrical stimulation. It is used in severe, refractory dystonia in CP.
Best results: In secondary dystonia due to basal ganglia lesions (e.g., status dystonicus, dyskinetic CP). Provides variable improvement, particularly in GMFCS IV–V with disabling dystonia.
Limitations: Expensive, surgical risk, variable outcomes in CP compared to primary dystonia.
- Antenatal magnesium sulphate for mothers at risk of preterm delivery before 32 weeks — reduces risk and severity of CP in preterm infants (neuroprotective)
- Therapeutic hypothermia (cooling) for neonatal HIE at ≥36 weeks gestation — reduces risk of CP and death if started within 6 hours of birth; core temperature maintained at 33–34°C for 72 hours
- Improved antenatal care: Prevention of prematurity, infections, IUGR
- Prevention and early treatment of neonatal jaundice — prevents kernicterus (dyskinetic CP)
- Erythropoietin: Neuroprotective role in preterm infants — under active research
- Mesenchymal stem cell therapy: Experimental — no current recommendation outside trials
Emerging evidence shows that 14–31% of CP cases (especially those without clear perinatal risk factors) have an underlying genetic etiology identifiable on chromosomal microarray or whole-exome sequencing (WES).
- Genetic causes include: copy number variants, de novo single-gene mutations (e.g., COL4A1, KANK1, SPAST, AP4 complex), and mitochondrial disorders.
- Genetic testing is now recommended in children with CP who have atypical features, normal MRI, dysmorphism, or family history.
- Identifying a genetic cause allows targeted treatment (e.g., levodopa for DRD, biotin for biotinidase deficiency) and accurate genetic counseling.
⚡ Key Points — Quick Revision
One-Liners for Exam
- Definition: Non-progressive disorder of movement/posture due to non-progressive brain lesion before 2 years of age
- Most common cause of childhood physical disability: CP (prevalence 2–3/1000 live births)
- Most common type: Spastic (~80%); Most common subtype: Spastic diplegia
- Most common risk factor: Prematurity + Low birth weight → PVL → Spastic diplegia
- Dyskinetic CP classic cause: Kernicterus (basal ganglia — globus pallidus involvement)
- Ataxic CP: Least common; cerebellar involvement; wide-based gait, intention tremor
- Spastic tone: Clasp-knife; velocity-dependent; hyperreflexia; Babinski positive
- Scissor gait: Spastic diplegia/quadriplegia (adductor spasticity)
- Moro disappears: By 4–6 months; ATNR by 4–6 months; Persistence → CP
- Parachute reflex: Emerges 6–9 months; ABSENT in CP
- GMFCS: 5-level classification (I = walks without limits → V = total wheelchair dependency)
- Gold standard imaging: MRI brain (PVL in preterm = periventricular white matter loss)
- Prognosis for walking: Sitting by 24 months → likely to walk; No head control by 20 months → unlikely
- BoNT-A: Focal spasticity; works 3–6 months; injected into overactive muscles
- Intrathecal Baclofen: Severe generalized spasticity; GMFCS IV–V
- SDR: Spastic diplegia; GMFCS II–III; age 3–10 years; permanent spasticity reduction
- CIMT: Hemiplegic CP; constrains good hand to train affected hand
- Mag sulphate: Given antenatally in preterm <32 weeks → prevents CP
- Therapeutic hypothermia: Neonatal HIE ≥36 weeks; within 6 hours; 72 hours at 33–34°C → reduces CP
- SEMLS: Single Event Multi-Level Surgery — corrects all lower limb deformities in one anesthetic
- Dopa-responsive dystonia (DRD) mimic: Always trial levodopa in a child with dystonia showing diurnal variation
- GMA (Prechtl): Absent fidgety movements → >98% sensitive for CP; allows diagnosis before 5 months
📊 CP Quick Classification Table
| Type | Cause | Tone | MRI | Associated |
|---|---|---|---|---|
| Spastic diplegia | Prematurity/PVL | Spastic (LL > UL) | PVL, corpus callosum thinning | Visual, mild cognitive delay |
| Spastic hemiplegia | Unilateral stroke/focal injury | Spastic (one side) | Focal infarct, porencephaly | Epilepsy (~30%), hand preference |
| Spastic quadriplegia | Severe HIE (term) | Spastic (all 4 limbs) | Diffuse injury, watershed | Worst prognosis; seizures, ID, dysphagia |
| Dyskinetic | Kernicterus / severe term asphyxia | Fluctuating | BG + thalami (GP prominent) | Dysarthria, sensorineural hearing loss |
| Ataxic | Cerebellar malformation/genetic | Hypotonic | Cerebellar atrophy/hypoplasia | Intention tremor, incoordination |