Clasp Knife Sign C4703724
A neurological reflex where muscle stiffness suddenly releases, like a pocketknife. It signals upper motor neuron damage from conditions like multiple sclerosis or spinal cord injury.
Key facts at a glance
- ICD-10
- G43.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- moderate
- Chronic
- false
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy