Pedicular Screwing in Lower Lumbar Surgery: With special reference to degeneration of the upper segment compared with anterior spinal fusin.

X-P evaluation of the upper disc of segments fixed using pedicle screws (PS) was performed on 45 cases available for an over 4-year follow-up, and was compared with the data of cases fixed using anterior fusion (ASF). The overall results of the development of disc degeneration were identical with those of the ASF group, but several cases developed instability or spondylolisthesis, and their results were poor. Four cases underwent operation again, and the number of re-operations is expected to increase in the future. Careful evaluation of pre-operative conditions and considerations of the operation are necessary, and the indication of the PS operation must be selected.