Modified Ashworth Scale
0: No increase in muscle tone.
1: Slight increase in muscle tone, manifested by a catch and release or by minimal resistance at the end of the range of motion when the affected part(s) is moved in flexion or extension.
1+: Slight increase in muscle tone, manifested by a catch, followed by minimal resistance throughout the remainder (less than half) of the ROM.
2: More marked increase in muscle tone through most of the ROM, but affected part(s) easily moved.
3: Considerable increase in muscle tone, passive movement difficult.
4: Affected part(s) rigid in flexion or extension.
References
The interrater and intrarater reliability of the Modified Ashworth Scale in the assessment of muscle spasticity: limb and muscle group effect. NeuroRehabilitation. 23 (3): 231–7
doi:
10.3233/NRE-2008-23304
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