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The occurrence of perioperative morbidities such as neurologic deterioration, cerebrospinal fluid (CSF) leakage, wound infection, pneumonia, heart problem, urinary difficulty, epidural hematoma, and deep vein thrombosis were checked. Also, we tracked the frequency of reoperation. 4. Statistical methods For statistical analysis, paired samples t test was conducted using SPSS software (version 17.0, SPSS Inc, Chicago, IL, USA). A probability value of less than 0.05 was considered significant. RESULTS 1. Clinical outcomes The mean VAS score at the 1 month after the surgery 6.7 (range, 5-9) was significantly lower than the preoperative score, 9.3 (range, 9-10). The mean VAS score decreased at each follow-up evaluation and was significantly lower at the last follow-up 4.1 (range, 2-5) compared with the preoperative score (Fig. 2). Fig. 2 Graph showing buy BMS-907351 visual anolog scale (VAS) before the surgery and during the follow-up period. The mean improvement of VAS from the pre-operation to the last follow-up was 5.2 points (from 9.3 to 4.1) (pBML-190 1, 6, 12 and the last follow-up ... According to the Odom's criteria, the results were excellent in 6 patients (35.3%), good in 7 patients (41.2%), and fair in 4 patients (23.5%) at the 6-month follow-up, and excellent in 7 patients (41.2%), Depsipeptide cost good in 8 patients (47.0%), and fair in 2 patients (11.8%) at the last follow-up. Therefore, the clinical success rate according to the Odom's criteria was 88.2%(Fig. 4). Fig. 4 The number of patients according to Odom's criteria at the 6 months after surgery and at the last follow-up. The Y axis represents the number of patients. 2. Radiological outcomes In all the patients, by CT scan immediately after the surgery, the cases of screw malposition were 6 (4.1%) out of 146 screws. However, there was no occurrence of neurological deficit or vascular complications, and also no need of screw correction. The mean TLA increased from 34.7�� before the surgery to 38.0�� at the 1 month after the surgery, however, decreased to 35.9�� at the last follow-up. The mean ASA was 5.7�� at preoperation and 7.0�� at the last follow-up. The mean ASA of the caudal adjacent segment was 5.6�� at pre-operation and 5.3�� at the last follow-up. There was no statistical significance in the changes of the TLA and ASA. Only 2 patients (11.