A method for control of the location of EMG electrodes in the multifidi, the longissimus and the iliocostalis muscles in the lumbar spine is presented. The insertion of the electrodes is guided radiographically with TV-fluoroscopy as well as electromyographically. The chosen site of the electrodes is then confirmed radiographically after injection of carbon dioxide through the electrode. The technique is discussed and the radiographic criteria for the location of the electrodes in the individual muscles is described.