Which muscles contribute to spasticity of the hand?

Updated: Jun 28, 2019
  • Author: Krupa Pandey, MD; Chief Editor: Stephen A Berman, MD, PhD, MBA  more...
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In the clenched fist, if the proximal interphalangeal (PIP) joints flex while the distal interphalangeal (DIP) joints remain extended, spasticity of the flexor digitorum superficialis (FDS), rather than the flexor digitorum profundus (FDP), may be suspected. A combined metacarpophalangeal flexion and PIP extension also may occur. A patient may be spastic in only 1 or 2 muscle slips of either FDP or FDS. Neurolysis with botulinum toxin is beneficial for spasticity of the intrinsic hand muscles because of their size and accessibility.

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