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Ashworth Scale of Muscle Tone
| Ashworth Scale | Degree of Muscle Tone |
| 1 | No increase in tone |
| 2 | Slight increase in tone, “catch” when limb is moved |
| 3 | Marked increase in tone, passive movements difficult |
| 4 | Considerable increase in tone, passive movements difficult |
| 5 | Affected part is rigid in flexion or extension |
