Sensitivity and Severity

Sensitivity:  How easily an inflammation or negative reaction is triggered.

Severity:  The degree of pain that is caused when triggered. 

High Sensitivity and High Severity:  Must be treated very cautiously.  Many movements will trigger pain reactions, and they will be strong. 

Low Sensitivity and High Severity:  Most movements will not cause problems, but the few that do will cause extreme pain.

High Sensitivity and Low Severity:  Many movements cause a reaction, but its just a dull pain. 

Low Sensitivity and Low Severity: If you're going to have pain, this is the best kind to have.  Rarely triggered, and when it is, it doesn't hurt *that* much.