REFERENCE · DIAGNOSIS

Functional Gait Disorder

Refers to:

dragging, knee buckling, hesitant or very slow walking;
swaying, crouching, unusual balance strategies or an astasia–abasia pattern; and
a functional movement pattern expressed mainly during standing or walking.

Scope boundary: Primary limb weakness also belongs on the weakness page, complete movement loss on the paralysis page, a sudden fall without definite blackout on the drop-attacks page, and persistent dizziness on the PPPD page. Gait comparisons apply only when standing and walking can be assessed safely.

Featured technique: Sign-based gait comparison across several safe walking tasks.
Diagnostic method: Identify reproducible inconsistency or incongruity rather than diagnosing from an unusual-looking gait alone.
Media needed: One continuous, safely spotted walking sequence from more than one angle.

Diagnostic techniques at a glance

These brief entries describe signs, observations, criteria and investigations clinicians may consider. They are not a checklist of tests everyone needs. Evidence and limitations differ for each entry; a positive sign must fit the whole clinical picture, including possible coexisting disease.

The longer explanations already on this page remain below. Individual technique pages will be developed and reviewed separately.

Knee buckling with preserved support

The clinician compares visible knee yielding with demonstrated leg strength and balance. A mismatch can support functional gait disorder, but negative myoclonus, pain and other causes can also buckle knees. Never withdraw support to see whether someone falls. [1][2]

Dragging and uneconomic postures

The examiner describes dragging, excessive slowness or energy-demanding postures and compares them with strength and balance. These are phenotype clues, not diagnostic shapes: dystonia, spasticity and other disorders may look unusual. [1][3]

Cautious “walking on ice” pattern

A wide-based, hesitant gait with unexpected preservation of balance can contribute to a functional assessment. Fear of falling and vestibular or sensory disease can produce similar caution. The clinician must show the actual inconsistency rather than diagnose from appearance. [1][3]

Dual-task walking

Walking is compared with walking while carrying out another safe task. Unexpected improvement may support a functional pattern. Other disorders can also respond to attention or cueing; instrumented research is promising but not a universal diagnostic rule. [1][4]

Backward walking

A safely guarded comparison may reveal substantially better movement backward than forward. This is a supportive observation, not a standalone test, because task-specific dystonia and other gait disorders may also improve backward. [1]

Running or another automatic movement

Only when safe and clinically appropriate, a different movement may reveal capacity absent during ordinary walking. Improvement is an observation to explain, not proof or a requirement. Many patients cannot safely undertake such comparisons. [1]

Rhythm and externally cued walking

A clinician compares gait with a tolerable external rhythm or cue. Improvement may show task-dependent access to movement but is not specific: Parkinsonian freezing and other disorders can respond too. [1]

Tandem gait

Guarded heel-to-toe walking may reveal preserved balance despite apparent instability in ordinary walking. Unusual compensatory movements require context. This comparison must not expose someone to a fall and has no universal standalone accuracy estimate. [1][2]

Romberg comparison

A supported standing assessment compares balance with eyes open and closed. Disproportionate sway without the expected loss of balance can be informative, but sensory or vestibular disease also changes performance. The examiner must be ready to prevent falling. [1][2]

Postural-response comparison

A clinician may compare responses to a carefully controlled balance challenge with ordinary transfers or walking. Inconsistency can be supportive; musculoskeletal limits and neurological postural impairment remain relevant. This is a guarded clinical examination, never a home push test. [1]

Swivel-chair test

The person’s ability to propel a wheeled chair with their legs is compared with walking. Original research and later blinded testing support cautious use; low sensitivity means many functional gait disorders will not show the sign. Chair mobility does not prove safe walking. [5][6]

Effort-associated behaviour (“huffing and puffing”)

A video study examined marked effort-related sounds and expressions during standing and walking. Such behaviour can be supportive within a wider pattern, but pain, breathlessness and distress must be considered. It is neither evidence of pretence nor required for diagnosis. [7]

Instrumented balance and adaptation studies

Posturography and moving-platform research assess sway and gait adaptation under controlled conditions. These are specialist or research approaches with limited generalisability; group differences do not yet supply a routine individual diagnostic test. [8][9]

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

For the Person With FND

There is no single “functional gait.” People may have knee buckling, dragging, very slow walking, excessive swaying, a crouched posture or another pattern. Some of these appearances also occur in neurological, vestibular, musculoskeletal or medication-related conditions.

A clinician looks for the pattern across tasks. For example, a gait difficulty may unexpectedly improve during safe backward walking, tandem walking, rhythmical stepping or another task that is normally more demanding. The improvement is not proof that the original difficulty was chosen. It may demonstrate that a more effective walking pattern remains available under different conditions. [1]

Not every person can safely perform every comparison. The examination should be adapted to falls, pain, weakness, dizziness, equipment and the person’s own limits.

Gait problems can be episodic or long-lasting

Functional gait difficulty may be present most of the time, fluctuate over a day, or appear mainly in episodes or particular situations. Some people notice marked changes when walking while distracted, in visually or socially busy places, when fatigued, or around other FND symptoms. These contexts vary from person to person and are not diagnostic by themselves.

If a familiar gait problem starts suddenly, preventing a fall comes first. Stop before continuing into an unsafe step, use the usual wall, rail, seat, mobility aid or trained supporter, and reduce extra tasks or stimulation if that is part of the person’s plan. Once safe, use one gait cue already practised with rehabilitation—such as an external target or rhythm—rather than trying multiple difficult walking tests. New inability to walk, new one-sided weakness, severe dizziness or another changed neurological pattern needs reassessment.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

For Family, Friends, and Other Supporters

Do not ask the person to walk without their usual aid or try harder tasks to see whether they “can really walk.” Gait comparison has to be selected and guarded by a clinician. A safer role is to report what walking looks like in ordinary settings and which supports, surfaces or tasks seem to change it.

When a gait episode starts

A person may walk relatively well in one setting and suddenly need an aid, seat or hands-on spotting in another. Treat the change as a safety problem first, not a test. Clear the path, bring the usual aid, use one agreed cue, and reduce competing instructions. Do not pull the person forward or insist that they push through an unsafe gait pattern.

Afterward, useful details include the environment, walking task, other symptoms, duration, falls or near-falls, and what helped the person resume safe movement.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

For Clinicians and the Care Team

Episodic and prolonged presentations

Document baseline walking as well as episodes: onset, frequency, duration, warning, environmental and dual-task context, associated motor, sensory, vestibular or seizure-like symptoms, aid use, falls and recovery. Functional gait disorder may be recurrent, situational or persistent. A normal-looking walk in the clinic does not invalidate a reproducible community problem, and situational variability alone does not establish FND.

When appropriate, review safely obtained video from the person’s usual environment. Translate positive gait transformations found in examination into a brief flare plan that starts with fall prevention and uses a previously successful rhythm, direction, external target or automatic stepping strategy only when it is safe for that person.

Technique outline: sign-based gait comparison

Obtain the history and complete a neurological, vestibular and musculoskeletal assessment appropriate to the presentation before interpreting gait variation.
Prepare a clear walkway with a trained spotter, gait belt when indicated, and the person’s usual aid. Do not remove an aid merely to make the sign more visible.
Record comfortable forward walking first. Note base, step length, rhythm, knee control, foot placement, trunk movement, arm swing and recovery from imbalance.
Select only safe comparison tasks relevant to the observed pattern. These may include a change in speed, backward walking, tandem walking, rhythmic cueing, a dual task or—in a person for whom it is genuinely safe—brief running.
Look for a reproducible change that is internally inconsistent with the baseline pattern or incongruent with recognized neurological gait disorders. An improvement during a more demanding task may be especially informative, but is not universal.
Consider fear of falling, pain, fatigue, footwear, environment, medication and coexisting disease. An unusual or dramatic gait is not automatically functional.
Explain any positive sign collaboratively and, where useful, connect the improved condition to physiotherapy rather than treating it only as a diagnostic observation.

Media contributor brief

Film the same short walkway in this order:

Forward walking at the person’s comfortable pace.
One selected comparison task.
A second comparison only if clinically useful and safe.
A clinician summary explaining the observed change.

Use a wide side view and a front or rear view, but show the complete uninterrupted pass before any close-up. Keep the usual aid and safety person visible. Do not stage a fall, ask for repeated knee buckling or use slow motion to sensationalize the gait. Captions should identify the task and observed change, not diagnose from appearance alone.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

Research and Sources

Evidence notes

The sign-based review organizes supportive functional gait findings into gait patterns, shows comparison tasks with clinical videos and repeatedly emphasizes pitfalls and coexisting neurological disease. [1]

Citation table

Citation	Full citation
[1]	Nonnekes J, Růžička E, Serranová T, Reich SG, Bloem BR, Hallett M. Functional gait disorders: a sign-based approach. Neurology. 2020;94(24):1093–1099. FND-CIT-0020. https://doi.org/10.1212/WNL.0000000000009649

[2]	Daum C, Gheorghita F, Spatola M, et al. Interobserver agreement and validity of bedside ‘positive signs’ for functional weakness, sensory and gait disorders in conversion disorder: a pilot study. Journal of neurology, neurosurgery, and psychiatry. 2015;86(4):425-430. DOI. PMID: 24994927. FND-CIT-0130.
[3]	Hayes MW, Graham S, Heldorf P, et al. A video review of the diagnosis of psychogenic gait: appendix and commentary. Movement disorders : official journal of the Movement Disorder Society. 1999;14(6):914-921. DOI. PMID: 10584664. FND-CIT-0143.
[4]	Gandolfi M, Fiorio M, Geroin C, et al. Dual tasking affects gait performance but not automaticity in functional gait disorders: A new diagnostic biomarker. Parkinsonism & related disorders. 2023;108:105291. DOI. PMID: 36764083. FND-CIT-0132.
[5]	Okun MS, Rodriguez RL, Foote KD, Fernandez HH. The “chair test” to aid in the diagnosis of psychogenic gait disorders. The neurologist. 2007;13(2):87-91. DOI. PMID: 17351529. FND-CIT-0127.
[6]	Lagrand TJ, Brusse-Keizer M, Charmley A, et al. A Critical Appraisal of the Whack-a-Mole and Swivel Chair Signs in the Diagnosis of Functional Movement Disorders. Movement disorders clinical practice. 2024;11(1):63-68. DOI. PMID: 38291841. FND-CIT-0181.
[7]	Laub HN, Dwivedi AK, Revilla FJ, et al. Diagnostic performance of the “Huffing and Puffing” sign in psychogenic (functional) movement disorders. Movement disorders clinical practice. 2015;2(1):29-32. DOI. PMID: 25961068. FND-CIT-0145.
[8]	Wolfsegger T, Pischinger B, Topakian R. Objectification of psychogenic postural instability by trunk sway analysis. Journal of the neurological sciences. 2013;334(1-2):14-17. DOI. PMID: 23932398. FND-CIT-0160.
[9]	Lin D, Castro P, Edwards A, et al. Dissociated motor learning and de-adaptation in patients with functional gait disorders. Brain : a journal of neurology. 2020;143(8):2594-2606. DOI. PMID: 32779724. FND-CIT-0117.

Technique outline created: August 24, 2026 · Neurology, physiotherapy and falls-safety review pending

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —