Comparison of Two Modes of Transcutaneous Electrical Nerve Stimulation (TENS) in Chronic Neuropathic Radiculalgia

"During the first month: Patients will have to test 3 sessions of TENS 1 hour/day. Depending on their arm assigned by randomization, patients will begin with c-TENS or m-TENS.~\[Cross-over\] During the second month: Patients will test the other type they do not have used yet according to the following scheme: 3 sessions of 1 hour, each day.~In this way, all patients will test successively the 2 different modes. After the end of the second month and up to the end of their participation (6 months after randomization) patients will be free to use the mode of TENS they prefer."