Anatomic basis for selective nervi-spinales infiltration in the treatment of articular back pain.

The purpose of this paper is to describe the radiologic anatomy for selective medial branch block for low back pain resulting from facet joints. A groove between the mammillary process and the accessory process (M-A groove) was chosen as the target point for this nerve block. The position of M-A groove was constant on X-rays at each level of the lumbar spine. Confirming this position under the fluoroscope. the medial branch nerves can be blocked selectively. This method clarifies the features of low back pain related to the medial branch.