Abstract
In the past 5 years, we have encountered 20 subjects who required repeat surgery for degenerative spondylolisthesis. We analyzed these patients data with regard to clinical symptoms, surgical results, and the main factors necessitating repeat surgery. The main factors necessitating repeat surgery were insufficient decompression of the lateral recess at the affected level and canal stenosis of the upper level after fusion. Patients who underwent fusion of the vertebrae during the initial surgery showed good improvement after the second surgery according to Hirabayashi's criteria, while those who did not undergo fusion showed less favorable results. Based on these observations, it can be concluded that sufficient decompression and adequate fusion should be achieved during the initial surgery.
