Grade

Definition

Indication

I

Low velocity, Low amplitude

Pain inhibition

II

Low velocity, Large amplitude in beginning to middle of pathological range

Pain inhibition

III

Low velocity, Large amplitude in middle to end of pathological range

Mechanical change, Pain inhibition

IV

Low velocity, Low amplitude at the end of the pathological range

Mechanical change, Pain inhibition

V

High velocity, Low amplitude (thrust)

Mechanical change, Pain inhibition