No effect of traction in patients with low back pain: a single centre, single blind, randomized controlled trial of Intervertebral Differential Dynamics TherapyŽ - Springer
Single study, patients all received conservative graded activity therapy. Half were given IDD treatments with the recommended increasing weights, the other half were put into the same machine but not given increasing weights just a very low weight. There was no benefit to the IDD therapy on any of the examined outcomes. Cannot find any other similar blind outcome studies. The manufacturer has produced data showing that after one year patients are better, but there is no control data.