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