0

No catch on rapid passive movement (RPM) [i.e. no spasticity].

1

Catch occurs on RPM followed by release. There is no resistance to RPM throughout rest of range.

2

Catch occurs in second half of available range (after halfway point) during PRM and is followed by resistance throughout remaining range.

3

Catch occurs in first half of available range (up to and including halfway point) during RPM and is followed by resistance throughout the remaining range.

4

When attempting RPM, the body part appears fixed but moves on slow passive movement.