Amipaque is a water soluble, non-ionic myelographic contrast media, and owing to its high diagnostic accuracy and safety, its use is gradually increasing. The authors studied the complications after Amipaque lumber myelography in 61 patients with low back pain during the period from January 1981 to November 1981 in Chung Ang University Hospital. The results were as follows: 1. Total complication rate was 52% (32 of 61) and there was no sexual difference in its occurrence. 2. In total, no difference in complication rate was found between head-up positioned group with a degree of 30$^{circ}$ (group I) after procedure and head-up positioned group with a degree of 70$^{circ}$ (group II) but female patients had more complication rate in group I than in group II (75% vs 50%). Headache was more common in group I and nausea was more common in group II. 3. Headache was most common complication (44%) and there was no sexual difference in its occurrence. 4. No significant difference in complication rate was found between patients proved to have HNP and patients to have not. 5. Complications were less common in patients with punctured level of L4-5 than in patients with L2-3 or L3-4 level puncture.