During 1985. 11. 1- 1986. 8.30., Liquid Crystal contact thermography were performed on low back pain patients with radiating pain to extremities. Its findings were compared with clinical manifestation, myelogram, CT scan and operative findings. RESULTS : 1. 39 of total 40 patients were male and the most age proportion was 30-49 year old ages. 2. 24 of 40 patients performed concomitant LCT & Myelography. Of these, 23 patients showed positive LCT while 20 patients showed positive myelogram findings. 3. On comparison study with LCT & Myelograpy, 20 of 24 patients positive findings on both study. 4. 18 of 40 patients, who performed LCT, were confirmed by CT scan or operation. Accuracy of LCT was 94% and its sensitivity was 100%. While 14 of 24 patients, who performed myelography, were confirmed. Accuracy of myelography was 86% and its sensitivity also 86%. LCT show more good co-relation with clinical manifestation and higher accuracy & sensitivity than conventional myelography. Th refore LCT is effective by adjunctive study with myelography on evaluation of clinically suggested spinal nerve root compression syndromes patients.