Copy physics movements from softbody meshes to bones

Hello everyone
I am having a problem
I need to copy rotation on local X axis of my bone from local X axis of a softbody mesh so to copy physics movements from a softbody to a bone. Is this possible?
I have tried to add “Copy rotation” constraint to bone from mesh but the result is very bad and I don’t know why doesn’t work…rotation is
How can I do this?
Thanks in advance