Cerebral Palsy

1. Clinical Overview

Definition

Cerebral palsy (CP) is defined as a group of permanent disorders of movement and posture, attributed to non-progressive disturbances that occurred in the developing fetal or infant brain.[1] The motor impairments are often accompanied by disturbances of sensation, perception, cognition, communication, behaviour, and epilepsy, creating a complex clinical phenotype requiring multidisciplinary management.

Summary

CP is the most common cause of physical disability in childhood, affecting approximately 1.5-2.5 per 1,000 live births globally, with prevalence remaining relatively stable despite advances in neonatal care.[2,3] This stability reflects improved survival of extremely premature infants, who remain at highest risk. Early diagnosis is now possible before 6 months corrected age using standardised neurological examination and neuroimaging, enabling earlier intervention.[3]

The condition is characterised by three critical features:

1. Motor impairment affecting movement and posture
2. Non-progressive brain lesion (static, though clinical manifestations evolve)
3. Early onset during brain development (prenatal, perinatal, or early postnatal period up to age 2)

CP is classified using three complementary systems: motor type (spastic 80-85%, dyskinetic 10-15%, ataxic 5%), topographical distribution (unilateral/bilateral), and functional severity using the Gross Motor Function Classification System (GMFCS levels I-V).[4] This classification framework predicts functional outcomes, guides intervention selection, and enables prognostic counselling.

Key Facts

• Global prevalence: 1.5-2.5 per 1,000 live births; up to 40-100 per 1,000 in extremely preterm infants (less than 28 weeks)[2,3]
• Primary risk factors: Prematurity (most significant), very low birthweight (less than 1500g), hypoxic-ischaemic encephalopathy, intrauterine infection, multiple pregnancy
• Timing: 70-80% prenatal, 10-20% perinatal/intrapartum, 5-10% postnatal (first 2 years)
• Neuropathology: Periventricular leukomalacia (PVL) in preterm; basal ganglia/thalamic injury in term asphyxia; focal infarcts in hemiplegia
• Motor types: Spastic (80-85%), Dyskinetic (10-15%), Ataxic (5%), Mixed
• GMFCS distribution: Levels I-II (ambulant, 60%), III (ambulant with aids, 15%), IV-V (non-ambulant, 25%)
• Associated impairments: Epilepsy (35-50%), intellectual disability (30-50%), speech/language disorders (60%), visual impairment (10-15%), hearing loss (5-10%)
• Comorbidities requiring screening: Hip displacement (35% overall, 90% in GMFCS V), scoliosis (20-60%), osteoporosis, pain (75%), sleep disorders
• Life expectancy: Near-normal in GMFCS I-II; significantly reduced in GMFCS V with severe comorbidities

Clinical Pearls

"Early Diagnosis is Now Standard": CP can be diagnosed before 6 months corrected age using the General Movements Assessment, Hammersmith Infant Neurological Examination, and MRI. Waiting until 12-24 months delays critical early intervention.[3]

"Non-progressive Brain, Progressive Musculoskeletal": The brain injury in CP is static by definition. However, musculoskeletal consequences (contractures, hip displacement, scoliosis) are progressive and require proactive surveillance. Any neurological regression indicates a different diagnosis and mandates urgent investigation.

"Regression = Not CP": Loss of previously acquired motor skills excludes CP. Investigate immediately for metabolic disorders (leukodystrophies, mitochondrial disease), genetic conditions (Rett syndrome), or structural lesions (tumours).

"Prematurity + White Matter = Spastic Diplegia": Periventricular leukomalacia affects corticospinal fibres to lower limbs preferentially. Classic presentation: spastic diplegia with scissoring gait, toe-walking, relatively preserved upper limb function.

"Hypotonia Precedes Spasticity": Many infants with spastic CP initially present with hypotonia during first 3-12 months. Spasticity typically emerges by 12-18 months. Early motor pattern may not predict final phenotype.

"GMFCS Predicts Function and Comorbidity Burden": GMFCS level at age 2-5 years strongly predicts lifelong mobility, hip displacement risk, and care needs. GMFCS curves show motor development trajectories plateau by age 7.[4]

"Dyskinetic CP = Acute Profound Insult": Bilateral basal ganglia/thalamic injury typically results from acute total asphyxia, kernicterus, or status dystonicus. Intelligence often preserved, but severe motor disability and communication challenges common.

Why This Matters Clinically

CP is a lifelong condition affecting 1 in 500 children, requiring coordinated multidisciplinary care spanning paediatrics, neurology, orthopaedics, rehabilitation, and allied health services. Early accurate diagnosis before 6 months enables access to neuroplasticity-driven interventions during critical developmental windows, improving motor and cognitive outcomes.[3]

Understanding CP classification guides prognosis: a child with GMFCS I spastic hemiplegia has excellent ambulatory potential and near-normal life expectancy, while GMFCS V quadriplegia requires high-intensity supportive care with higher comorbidity burden. Recognising the static nature of brain injury distinguishes CP from progressive disorders requiring urgent investigation. Finally, proactive surveillance for musculoskeletal complications (hip displacement screening from age 1) prevents painful dislocations and optimises quality of life.[5,6]

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2. Epidemiology

Incidence & Prevalence

Demographics

Risk Factors

Timing of Brain Injury

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3. Pathophysiology

Mechanisms of Brain Injury

Step 1: Vulnerability of Developing Brain

• Immature brain is susceptible to hypoxia, ischaemia, and inflammation
• Oligodendrocyte precursors (myelinating cells) are particularly vulnerable
• Timing of insult determines pattern of injury

Step 2: Preterm Brain Injury (Periventricular Leukomalacia)

• Premature infants vulnerable to white matter injury
• Periventricular region has watershed blood supply
• Hypoxia-ischaemia damages oligodendrocyte precursors
• Results in cystic or diffuse white matter injury
• Motor fibres to legs run close to ventricles → spastic diplegia

Step 3: Term Brain Injury (Watershed/Basal Ganglia)

• Term infants susceptible to grey matter injury
• Watershed zones (between vascular territories) vulnerable
• Basal ganglia and thalamus affected in acute severe asphyxia
• Results in spastic quadriplegia or dyskinetic CP

Step 4: Vascular Injury

• Intrauterine stroke → hemiplegic CP
• Middle cerebral artery territory most common
• May affect one hemisphere → contralateral hemiplegia

Step 5: Secondary Musculoskeletal Changes

• Imbalanced muscle activation → contractures
• Abnormal forces on growing skeleton → hip dysplasia, scoliosis
• Spasticity gradually worsens muscle shortening
• Bone density reduced due to immobility

Classification by Motor Type

Classification by Distribution

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4. Clinical Presentation

Early Signs (Infants)

Signs by CP Type

Associated Conditions

Red Flags

[!CAUTION] Red Flags — Consider Alternative Diagnosis:

• Developmental REGRESSION — loss of previously acquired skills (NOT CP)
• Progressive deterioration of motor function
• Normal early development followed by late-onset symptoms
• Family history of neurological disease
• Dysmorphic features suggesting genetic syndrome
• No identified risk factors for CP
• MRI normal or shows unexpected findings

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5. Clinical Examination

Structured Examination

General Observation:

• Posture at rest
• Spontaneous movement pattern
• Asymmetry
• Involuntary movements
• Alertness and interaction

Motor Examination:

• Tone: Spasticity (velocity-dependent), rigidity, hypotonia
• Power: Weakness pattern (pyramidal = extensors in arms, flexors in legs)
• Reflexes: Hyperreflexia, clonus, Babinski sign
• Primitive reflexes: Persistence of Moro, ATNR, grasp

Gait Assessment:

• Scissoring (spastic diplegia)
• Circumduction (hemiplegia)
• Toe-walking
• Crouch gait (hip and knee flexion in older children)
• Ataxic gait (wide-based, unsteady)

Oromotor Assessment:

• Drooling
• Jaw thrust
• Tongue thrust
• Swallowing coordination

Special Tests

Functional Classification (GMFCS)

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6. Investigations

First-Line Investigations

MRI Findings by CP Type

Additional Investigations

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7. Management

Management Algorithm

              CEREBRAL PALSY MANAGEMENT
                        ↓
┌───────────────────────────────────────────────────────────────┐
│                   DIAGNOSIS & CLASSIFICATION                   │
├───────────────────────────────────────────────────────────────┤
│  ➤ MRI brain to identify lesion                               │
│  ➤ Classify: Motor type (spastic, dyskinetic, ataxic)         │
│  ➤ Classify: Distribution (hemiplegia, diplegia, quadriplegia)│
│  ➤ Classify: GMFCS level (I-V)                                │
│  ➤ Screen for comorbidities (epilepsy, vision, hearing)       │
└───────────────────────────────────────────────────────────────┘
                        ↓
┌───────────────────────────────────────────────────────────────┐
│              MULTIDISCIPLINARY TEAM (MDT)                      │
├───────────────────────────────────────────────────────────────┤
│  ➤ Paediatrician/Neurologist — Coordination, seizures, meds  │
│  ➤ Physiotherapy — Motor function, strength, mobility         │
│  ➤ Occupational Therapy — Fine motor, ADLs, equipment         │
│  ➤ Speech & Language Therapy — Communication, swallowing      │
│  ➤ Orthopaedics — Hip surveillance, contractures, surgery     │
│  ➤ Rehabilitation — Comprehensive care                        │
│  ➤ Social services — Support, respite, benefits               │
│  ➤ Education — Special educational needs support              │
│  ➤ Psychology — Behavioural, emotional support                │
└───────────────────────────────────────────────────────────────┘
                        ↓
┌───────────────────────────────────────────────────────────────┐
│             SPASTICITY MANAGEMENT                              │
├───────────────────────────────────────────────────────────────┤
│  CONSERVATIVE:                                                 │
│  ➤ Physiotherapy — Stretching, strengthening                  │
│  ➤ Orthoses — AFOs, splints                                   │
│  ➤ Positioning — Standing frames, seating                     │
│                                                               │
│  PHARMACOLOGICAL:                                              │
│  ➤ Oral: Baclofen, diazepam, tizanidine                       │
│  ➤ Focal: Botulinum toxin A injections (key muscles)          │
│  ➤ Intrathecal: Baclofen pump (severe generalised spasticity) │
│                                                               │
│  SURGICAL:                                                     │
│  ➤ Selective Dorsal Rhizotomy (SDR) — Selected GMFCS II-III   │
│  ➤ Orthopaedic surgery — Tendon lengthening, osteotomies      │
│  ➤ Hip reconstruction — For subluxation/dislocation           │
└───────────────────────────────────────────────────────────────┘
                        ↓
┌───────────────────────────────────────────────────────────────┐
│              COMORBIDITY MANAGEMENT                            │
├───────────────────────────────────────────────────────────────┤
│  ➤ Epilepsy — Antiepileptic drugs (LEV, VPA, etc.)            │
│  ➤ Feeding — Gastrostomy if unsafe oral feeding               │
│  ➤ Drooling — Anticholinergics, botox to salivary glands      │
│  ➤ Constipation — Laxatives, dietary management               │
│  ➤ Pain — Often undertreated; multimodal approach             │
│  ➤ Sleep — Sleep hygiene, melatonin                           │
│  ➤ Behaviour — ADHD meds, psychology input                    │
└───────────────────────────────────────────────────────────────┘

Spasticity Management Algorithm

Pharmacological Treatments

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8. Complications

Musculoskeletal Complications

Medical Complications

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9. Prognosis & Outcomes

Ambulatory Prognosis

Life Expectancy

Prognostic Factors

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10. Evidence & Guidelines

Key Guidelines

Landmark Studies

GMFCS Development (Palisano et al. 1997)

• Developed 5-level classification system
• Validated, reliable, widely used globally
• Predicts motor prognosis
• PMID: 9161656

SDR Evidence (McLaughlin et al. 2002)

• RCT of Selective Dorsal Rhizotomy
• Showed improvements in spasticity and function in selected children
• PMID: 11872903

Swedish Hip Surveillance Programme

• Population-based hip surveillance reduced dislocation rate from 8% to less than 0.5%
• Model for preventive orthopaedic care
• PMID: 15580352

Evidence Strength

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11. Patient/Layperson Explanation

What is Cerebral Palsy?

Cerebral palsy (CP) is a condition that affects movement and posture. It is caused by damage to the developing brain, usually before or around birth. "Cerebral" refers to the brain, and "palsy" means problems with movement.

Why does it happen?

The brain injury that causes CP can happen:

• Before birth (most common) — often related to premature birth
• During birth — lack of oxygen (rare)
• After birth — infections like meningitis, or head injury (rare)

In many cases, the exact cause is not known.

What are the symptoms?

CP affects children differently. Some have mild difficulties, while others have more significant challenges:

• Stiff or floppy muscles
• Difficulty with walking, balance, or coordination
• Problems with fine movements (writing, dressing)
• Speech difficulties
• Some children may also have learning difficulties, epilepsy, or vision problems

How is it treated?

There is no cure for CP, but many treatments help:

• Physiotherapy — to improve movement and prevent stiffness
• Occupational therapy — to help with everyday tasks
• Speech therapy — to improve communication and swallowing
• Medicines — to reduce muscle stiffness (spasticity)
• Botox injections — to relax specific muscles
• Surgery — sometimes needed for tight muscles or hip problems

What to expect?

CP is a lifelong condition, but it is NOT progressive — the brain injury does not get worse. Many children with CP live happy, fulfilling lives. Early intervention and ongoing support make a big difference.

When to seek help

See a doctor if you notice:

• Your child losing skills they previously had (this is NOT typical of CP)
• Worsening seizures
• Difficulty breathing or frequent chest infections
• Signs of hip pain or worsening walking

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12. References

Guidelines

1. National Institute for Health and Care Excellence (NICE). Cerebral palsy in under 25 s: assessment and management (NG62). 2017. nice.org.uk/guidance/ng62

2. NICE. Spasticity in under 19 s: management (CG145). 2012. nice.org.uk/guidance/cg145

Key Studies

3. Palisano R, Rosenbaum P, Walter S, et al. Development and reliability of a system to classify gross motor function in children with cerebral palsy. Dev Med Child Neurol. 1997;39(4):214-223. PMID: 9161656

4. McLaughlin J, Bjornson K, Temkin N, et al. Selective dorsal rhizotomy: meta-analysis of three randomized controlled trials. Dev Med Child Neurol. 2002;44(1):17-25. PMID: 11811645

5. Hägglund G, Andersson S, Düppe H, et al. Prevention of dislocation of the hip in children with cerebral palsy. J Bone Joint Surg Br. 2005;87(1):95-101. PMID: 15686244

Reviews

6. Rosenbaum P, Paneth N, Leviton A, et al. A report: the definition and classification of cerebral palsy April 2006. Dev Med Child Neurol Suppl. 2007;109:8-14. PMID: 17370477

7. Novak I, Morgan C, Adde L, et al. Early, Accurate Diagnosis and Early Intervention in Cerebral Palsy: Advances in Diagnosis and Treatment. JAMA Pediatr. 2017;171(9):897-907. PMID: 28715518

Patient Resources

8. Scope. Cerebral palsy information. scope.org.uk

9. Cerebral Palsy Scotland. cerebralpalsyscotland.org.uk

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13. Examination Focus

High-Yield Exam Topics

Sample Viva Questions

Q1: A 2-year-old presents with motor delay, spasticity, and scissoring gait. What is the likely diagnosis and what investigations would you perform?

Model Answer: The presentation suggests spastic diplegic cerebral palsy. I would take a detailed history including pregnancy, prematurity, neonatal course, and developmental history. Key investigation is MRI brain, which would likely show periventricular leukomalacia (PVL) in a previously preterm infant. I would also screen for associated conditions: vision and hearing assessment, developmental assessment. I would classify using GMFCS and establish multidisciplinary follow-up with physiotherapy, orthopaedics (hip surveillance), and speech therapy.

Q2: Why is it important to distinguish CP from progressive neurological conditions?

Model Answer: CP is characterised by a non-progressive brain injury. The clinical presentation may evolve as the child develops, but there should be no regression of skills. If a child loses previously acquired skills or shows progressive deterioration, this suggests a different diagnosis such as:

• Metabolic disorders (leukodystrophies, mitochondrial diseases)
• Neurodegenerative conditions (Rett syndrome, Batten disease)
• Structural lesions (tumours)

This distinction is critical because progressive conditions require specific investigation (metabolic screen, genetic testing) and may have different treatments or implications for prognosis and genetic counselling.

Q3: What is the evidence for Selective Dorsal Rhizotomy (SDR)?

Model Answer: SDR is a neurosurgical procedure that selectively cuts sensory nerve rootlets in the lumbar spine to reduce spasticity. Evidence supports its use in carefully selected ambulant children with spastic diplegia (typically GMFCS II-III). McLaughlin et al.'s meta-analysis of three RCTs showed improvements in spasticity and gross motor function. Selection criteria include: pure spasticity (not dystonia), adequate strength, reasonable cognition for rehab, and clear evidence of spasticity limiting function. SDR requires intensive post-operative rehabilitation. It is not suitable for all children and requires specialist assessment.

Common Exam Errors

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Last Reviewed: 2025-12-24 | MedVellum Editorial Team

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Medical Disclaimer: MedVellum content is for educational purposes and clinical reference. Clinical decisions should account for individual patient circumstances. Always consult appropriate specialists.