[Percutaneous bipolar discectomy. Technical principles and initial results with an in vitro model]

In the present study, the effect of bipolar radio-frequency thermocoagulation of intervertebral discs was evaluated in an in vitro model. In fresh human cadaveric thoracic and lumbar motion segments, we applied radio-frequency energy to the intervertebral disc via a variety of different bipolar HF electrodes, while simultaneously recording the temperature of the dorsal longitudinal ligament. All the segments were weighed in a standardised manner prior to and after the procedure. It was found that a combination of coagulation and vaporisation was most suitable for working on the disc. Applying energy for 300 secs resulted in an average weight loss ranging, electrode-dependently, from 0.3 to 0.7 grams, the mean temperature increase in the longitudinal ligament was 0.1 degree C per min.

Our experimental data suggest that PBD may be used for the same indications as the laser in the treatment of disc disease.