01Purpose and principlesWhat the assessment is for and the core concepts behind it.
Walking integrates strength, tone, sensation, vision, vestibular function, cerebellar timing, basal-ganglia scaling, cognition and joints. Begin with history of onset, falls, direction of falls, freezing, dizziness, footwear, pain, sensory symptoms, bladder change and assistive devices. Ask whether difficulty occurs in darkness, on uneven ground, during turns or after standing, and obtain collateral history because the patient may not recognise freezing or truncal sway.
Cerebellar examination samples eye movements, speech, upper- and lower-limb coordination, rebound or check where safely performed, stance and gait. True cerebellar error is often irregular and worsens near a target. An intention tremor increases toward the goal; dysdiadochokinesia impairs rhythm and amplitude of alternating movements; decomposition breaks a smooth action into components. No individual sign is perfectly specific, and weakness or sensory loss must be tested separately.
Ataxia is a description, not a cause. Cerebellar ataxia remains evident with visual input, sensory ataxia becomes substantially worse without vision, and vestibular dysfunction often includes vertigo, nystagmus and lateral veering. Toxic, nutritional, immune, hereditary, degenerative, neoplastic and vascular processes differ in tempo. Acute onset is an emergency; a subacute progressive syndrome may indicate inflammation, deficiency, drug toxicity or malignancy and should not be relegated automatically to routine falls care.
Functional gait disorder is recognised by positive features such as internally inconsistent impairment across tasks, improvement with distraction or patterns incongruent with known anatomy, assessed by an experienced clinician. Dramatic appearance alone is not diagnostic. It can coexist with Parkinson's disease, vestibular dysfunction or neuropathy and should be explained as a genuine disorder of movement control.
Key points
- Observe the patient rising, initiating, walking, turning and sitting; record aid and assistance. The gait starts before the formal corridor walk and safety takes precedence over completing every manoeuvre.
- Describe components rather than naming a gait alone: base, posture, stride length, step height, cadence, symmetry, arm swing, foot placement, trunk movement, turning and response to dual task.
- Cerebellar dysfunction can cause broad base, variable step timing, veering, impaired tandem gait, dysmetria, intention tremor, dysdiadochokinesia, nystagmus and scanning or slurred speech.
- Romberg testing principally challenges proprioceptive and vestibular compensation. Disproportionate worsening after eye closure supports sensory or vestibular ataxia, not a positive cerebellar test.
- Finger–nose and heel–shin testing require adequate power, range, vision and comprehension. Compare sides, vary target position and interpret error with the rest of the neurological examination.
- Parkinsonian gait features include reduced arm swing, stooped posture, shortened steps, start or turning hesitation and festination; early recurrent falls or marked symmetry should trigger review for atypical parkinsonism.
- A high-stepping gait suggests distal dorsiflexion weakness; circumduction may compensate for a stiff or weak leg; waddling and Trendelenburg patterns point toward proximal or hip-abductor dysfunction.
- Frontal or higher-level gait disorder may show difficulty initiating, short shuffling steps and apparent 'magnetic' feet despite better leg movement when seated, usually with other frontal or cognitive features.
- Medication, alcohol, sedatives, anticonvulsants, vision, footwear, vestibular disease, arthritis, orthostatic hypotension and fear of falling can all alter gait without a primary cerebellar lesion.
- Acute vestibular bedside testing is specialist-sensitive: use HINTS only in continuous acute vestibular syndrome, only when trained, and never to override obvious focal neurology or an inappropriate clinical context.
- Document what made walking unsafe and arrange an alternative functional assessment; 'gait not tested' without reason hides an important risk decision.
02Indications, selection and cautionsWhen it is useful, when urgency changes and important limitations.
Marked truncal instability, broad stance, titubation and gait ataxia out of proportion to limb dysmetria points toward vermian or midline cerebellar dysfunction. Acute severe truncal ataxia can be a posterior-circulation emergency.
Ipsilateral limb dysmetria, intention tremor, dysdiadochokinesia and rebound with associated gait veering supports a cerebellar hemisphere lesion, after excluding weakness, proprioceptive loss and visual limitation.
Heavy heel strike, watching the feet, impaired vibration or joint position and pronounced worsening on eye closure suggests large-fibre or dorsal-column dysfunction. A broad base alone does not distinguish it from cerebellar disease.
Reduced stride, diminished arm swing, stooped posture, en-bloc turning, freezing and festination with bradykinesia and rigidity supports parkinsonism. Pull testing is performed only when trained and able to prevent a fall.
A stiff adducted leg, circumduction, reduced knee flexion and an equinovarus posture can reflect corticospinal dysfunction. Bilateral scissoring or a sensory level raises spinal-cord localisation.
Exaggerated hip and knee flexion with foot slap or toe catching reflects dorsiflexion weakness. Determine whether it is unilateral from peroneal or root disease or bilateral within a polyneuropathy.
Vertigo, nausea, spontaneous nystagmus and veering may accompany peripheral vestibular disease, but central pathology becomes more likely with severe truncal ataxia, vertical or direction-changing nystagmus, skew or other focal signs.
03Method and interpretationA systematic approach to the test and its findings.
Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.
- 01
Full neurological and musculoskeletal examinationFirst step - Why
- Identify the strength, tone, sensation, eye movement, extrapyramidal, vestibular and joint contributors to gait dysfunction.
- Interpretation and limitations
- Gait labels are syndromic. Findings such as neuropathy plus knee osteoarthritis may both matter; document the proportion each plausibly contributes and avoid attributing all falls to one abnormality.
- 02
Lying and standing blood pressure with cardiovascular review - Why
- Detect orthostatic hypotension and circulatory causes of unsteadiness or falls.
- Interpretation and limitations
- Relate the timed blood-pressure change to symptoms and medicines. A neurological gait disorder and orthostasis may coexist, particularly in Parkinson's disease, autonomic neuropathy and older adults.
- 03
Urgent stroke imaging - Why
- Assess haemorrhage, infarction and arterial occlusion when gait or coordination loss is sudden.
- Interpretation and limitations
- Non-contrast CT can be normal early in posterior-fossa ischaemia. Stroke specialists select CT angiography, perfusion or MRI from onset, signs and reperfusion implications.
- 04
MRI brain with posterior-fossa sequences - Why
- Evaluate subacute or progressive cerebellar inflammation, degeneration, neoplasm, demyelination and small infarction.
- Interpretation and limitations
- Discuss protocol and urgency with neurology or neuroradiology. Cerebellar atrophy is a radiological description and does not establish hereditary, toxic or degenerative cause by itself.
- 05
Targeted blood and exposure assessment - Why
- Identify alcohol, medication, thyroid, B12, folate, glucose, electrolyte, liver, immune or malignant contributors where clinically plausible.
- Interpretation and limitations
- Review doses and timing of anticonvulsants, sedatives and lithium as well as prescribed lists. Rapid or subacute unexplained ataxia often needs specialist-guided immune, nutritional, genetic or paraneoplastic testing.
- 06
Physiotherapy and occupational functional assessment - Why
- Quantify transfers, walking safety, aid requirements, home risks and rehabilitation potential.
- Interpretation and limitations
- Functional assessment complements rather than replaces diagnosis. New severe impairment remains a medical emergency until central, toxic and metabolic causes are addressed.
04Clinical next stepsHow the result changes management or prompts escalation.
01Sudden ataxiaAssume posterior circulation riskFirst stepAbrupt gait failure, limb dysmetria or continuous vertigo with new neurological signs or severe truncal instability.+
- 1Perform ABCDE and glucose, establish last known well and examine speech, gaze, nystagmus, skew, fields, face, all limbs, sensation, coordination and ability to sit or stand safely.
- 2Activate the stroke service for urgent brain and vascular imaging; do not reassure from a negative FAST screen or an early normal non-contrast CT when the syndrome remains coherent.
- 3Use HINTS only if the patient has the correct continuous acute vestibular syndrome and the examiner is trained; follow specialist reperfusion, monitoring and swallow decisions.
02Progressive unsteadinessSeparate systems and tempoGait and coordination decline over days, weeks or months without current stroke physiology.+
- 1Characterise falls, vertigo, sensory dependence, parkinsonism, cognition, autonomic symptoms, alcohol, medicines, cancer, infection and family history, then observe unaided function only when safe.
- 2Examine eye movements, speech, limb coordination, power, reflexes, proprioception, extrapyramidal signs, feet and joints; select MRI and laboratory tests from the resulting syndrome.
- 3Refer urgently for rapid subacute progression or associated systemic red flags, and address aids, home safety, driving and falls rehabilitation in parallel with diagnosis.
03Falls in later lifeUse multifactorial assessmentRecurrent falls, fear of falling or new transfer difficulty in an older person with mixed possible contributors.+
- 1Ask about prodrome, loss of consciousness, injuries, footwear, vision, continence, cognition, environment and medicines; check orthostatic observations and examine gait, balance, strength and neurology.
- 2Treat time-critical syncope, stroke, fracture, infection or medicine toxicity first, then involve falls, physiotherapy, occupational therapy, pharmacy and vision services according to identified needs.
- 3Agree realistic mobility and prevention goals, provide the correct aid and follow improvement, near-falls and adherence rather than assuming advice alone changes risk.
05Risks, monitoring and follow-upComplications, safety checks and further assessment.
- Record the exact assistance and walking aid used, distance achieved, turn quality and reason for stopping so later assessments are comparable.
- Repeat eye movements, speech, coordination and truncal stability immediately if acute vestibular or posterior-circulation symptoms evolve.
- Trend falls, near-falls, freezing, orthostatic symptoms and medication changes rather than relying only on a clinic corridor snapshot.
- Monitor nutrition, alcohol exposure and levels or organ function for medicines capable of producing ataxia when the clinical setting supports testing.
- Reassess home and transfer safety after acute illness because a technically improved neurological examination may not restore independent function.
- Give an emergency safety net for sudden imbalance, diplopia, dysarthria, weakness, severe headache, inability to sit or repeated vomiting.
06Special situationsVariants, exceptions and circumstances that change the usual approach.
Turning magnifies gait disorders
Parkinsonian freezing, frontal initiation difficulty and instability may be subtle in straight walking but emerge during a narrow turn. Count steps and observe direction without provoking a fall.
Tandem gait is sensitive
Difficulty with heel-to-toe walking can reveal mild ataxia but is non-specific and affected by age, footwear, joint disease and unfamiliarity. Compare it with ordinary stance and gait.
Eyes open matters
A patient unable to maintain stance even with visual input may have severe cerebellar, vestibular, motor or functional impairment; it is unsafe and unhelpful to proceed automatically to eye closure.
Speech localises imperfectly
Cerebellar dysarthria can be scanning or irregular, but slurred speech also follows weakness, extrapyramidal disease, intoxication and structural oral problems. Pair it with ocular and limb signs.
Falls can be cardiovascular
Patients may describe syncope as a fall, especially without a witness. Ask about posture, prodrome, palpitations and amnesia and do not confine every gait complaint to neurology.
Acute severe gait ataxia counts
Posterior-circulation stroke can present predominantly with inability to walk, vertigo or vomiting. Lack of limb paresis does not make a disabling acute balance syndrome benign.
07Common pitfallsFrequent interpretation and management errors.
- 01
Calling Romberg positive when the patient is already unable to stand safely with eyes open.
- 02
Diagnosing cerebellar disease from finger–nose error in a markedly weak or visually impaired limb.
- 03
Using HINTS for brief positional dizziness, resolved symptoms or without appropriate training.
- 04
Excluding stroke because gait ataxia occurs without facial droop or arm weakness.
- 05
Writing 'unsteady gait' without base, stride, turning, aid or assistance.
- 06
Attributing recurrent falls to age before assessing medicines, orthostasis, vision, cognition and environment.
- 07
Provoking tandem gait or pull testing when there is no safe way to prevent injury.