Your blows are not only deadly, but debilitating as well.
Whenever you confirm a critical hit, you can also affect the target as if you had succeeded at a dirty trick combat maneuver check. Doing so normally causes the target to suffer for 1 round one of the conditions applied by a dirty trick, unless you have feats or abilities that give you more dirty trick options.
You can apply the effects of only one critical feat to a given critical hit unless you possess Critical Mastery.
The text on this page is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.
Sources:
SECTION 15