Functional neurological disorder (FND) -- previously called conversion disorder, psychogenic movement disorder, or medically unexplained neurological symptoms -- is a condition where the nervous system does not function correctly, producing genuine neurological symptoms (weakness, tremor, gait disturbance, sensory loss) without detectable structural pathology on imaging or nerve conduction studies. FND is not fabrication or malingering; it is a real neurological condition with a different mechanism from structural neurological diseases.
FND Gait Presentations
FND produces a range of gait disturbances that can resemble other neurological conditions:
- Functional leg weakness -- the leg gives way unpredictably; may drag or buckle
- Functional tremor -- leg or whole-body tremor during walking, often variable in severity
- Astasia-abasia -- inability to walk despite ability to move the legs normally when lying down (a classical FND presentation)
- Functional dystonia -- sustained abnormal postures of the foot or leg during walking
- Slowness and deliberate gait -- exaggerated caution during walking
Walking Cane in FND: Controversial Territory
The role of walking aids in FND is debated among neurologists and physiotherapists specialising in FND. Two perspectives:
Against routine cane prescription in FND: Some FND specialists argue that providing a walking aid reinforces illness behaviour and may deepen disability by confirming a permanent physical limitation. In FND, the brain is producing symptoms; a cane may increase focus on the symptom.
For cane use in appropriate FND cases: Other specialists note that in severe functional gait impairment, a cane provides genuine safety (fall prevention) while physiotherapy addresses the underlying mechanism. For patients with severe functional weakness who are falling, the choice between a cane (fall prevention) and no aid (falls) is not a theoretical debate.
The Physiotherapy-Led Approach
Most FND rehabilitation programmes use physiotherapy (with a specific FND-adapted approach) as the primary treatment, not long-term walking aid prescription. A cane may be used as a temporary tool during the rehabilitation phase while gait is being retrained, then withdrawn as function improves.
FND Gait Type and Walking Aid Approach
| FND Gait Presentation | Walking Aid | Notes |
|---|---|---|
| Functional leg weakness with falls | Cane for fall prevention (temporary) | Physiotherapy primary treatment; cane withdrawn as gait improves |
| Functional tremor affecting balance | Cane for stability during tremor episodes | Tremor often reduces with physiotherapy and psychological treatment |
| Astasia-abasia | Frame or bilateral support initially | Specialist FND physiotherapy programme; gradual withdrawal of aids |
| Mild functional gait (preserved safe walking) | No aid preferred | Aid may reinforce; physiotherapy and psychology primary |
Related: Walking Cane for Balance Disorders. Explore DaiWalk walking canes.
