0
No increase in tone
1
Slight increase in tone
Manifested by catch and release or by minimal resistance at the end of range
1+
Slight increase in tone
Manifested by a catch
followed by minimal resistance throughout remainer (less than half) of ROM
2
Marked increase in tone throughout most of ROM. Part is still easily moved
3
Considereable increase
Part is hard to move
4
Part is rigid in flexion or extension