of course there are cons. all approaches have cons. in the case of the mckenzie method the con is limited adaptability. it is a narrow focus that lacks many tools. when it doesn't work, often times it suggests no where to go.

on the other hand, when it works it works very well. more people should be familiar with the method. however, to focus only on the mckenzie method is dangerous. even their own research shows that maybe 50% of people respond well to their treatment when they have low back pain. what about the rest?