OBJECTIVE: As for the operation of lumbar spondylolysis and spondylolysic spondylolthesis combination of decompression and fixation is generic. However, we will report our results in a series of 26 patients who underwent decompression without fusion treated for spondylolysis and spondylolysic spondylolisthesis. PATIENTS AND METHOD: In 26 patients (mean age 54.2 years) who underwent decompression without fusion treated for spondylolysis and spondylolysic spondylolisthesis, the postoperative follow-up time was 16.8 months. We divided them into A group and B group. The A group performed subtotal resection of floating lamina, the B group performed total resection of floating lamina. The following were clinical outcome(the recovery rate of JOA score), lower back pain (JOA score) and use of anti-inflammatory agents. RESULTS: The symptom recovery rate of Group A, assessed on the JOA score was 66.8%, and 84.3% for the B group. We performed re-operation in 2 patients of the A group. It was thought that the remaining floating lamina was caused by the recompression of the nerve root. We performed re-operation that removed the remaining floating lamina and the right amount of ambient fibrous tissue. As for the lower back pain, both groups had improvement tendency. Use of postoperative anti-inflammatory agents disappeared in 18 patients, and all patients had improvement tendency. CONCLUSION: In the short-term, we obtained good operation results of decompression without fusion treated for spondylolysis and spondylolysic spondylolisthesis. On the occasion of an operation, it is important to perform enough decompression by resection of floating lamina.
