hi,
it might help to relieve some stiffness in a few cases however it might also worsen it in others.
traction in most cases is not the solution.
without proper diagnosis one must not use a machine like that to avoid further damage.
I know 101 reasons where the use of such a device is contra-indicated.
It can temporarily bring relief because stretched muscles put less stress on nerves but once the stretching stops the problem often returns after a short while because the main cause for the muscle tension (misalignment in the joints) cannot be corrected by traction! It may worsen the condition and make the user dependant on the device until real bad damage is only a matter of time.
However we can do all what any device can do actually better ourselves with the correct exercises and if necessary therapy in the start.