The percussor is a device that increases the motion of joints in a gentle way. It feels like a very strong vibrator. I use it on nearly every patient because it is so gentle and the results can be so dramatic. I especially use it to increase the motion of the shoulder girdle and neck.
The way it works is to stretch connective tissue.This includes ligaments (they join bone to bone), tendons (they join muscle to bone) and sheet of connective tissue much like a plastic wrap of connective tissue that surrounds your muscles.
Getting the joints to be freely moving relieves stress on the muscles. It is your muscles that are painful but it's the tight connective tissue that is making them work so hard and causing pain.