| Grade |
Assessment Criteria |
| Grade 0 |
No increase in muscle tone |
| Grade 1 |
Slight increase in muscle tone: minimal resistance at the end of the range of motion when the affected part is moved in flexion or extension, or a sudden catch and release |
| Grade 1+ |
Slight increase in muscle tone: a catch followed by minimal resistance throughout the remainder (less than half) of the range of motion |
| Grade 2 |
More marked increase in muscle tone through most of the range of motion, but affected part is easily moved |
| Grade 3 |
Considerable increase in muscle tone, passive movement difficult |
| Grade 4 |
Affected part rigid in flexion or extension |
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