Asymmetrical pedicle subtraction osteotomy for XXXX .

@entity1 @entity2003 @entity190 @entity1513 @entity1515 @entity179
STUDY DESIGN: A prospectively study. OBJECTIVE: Our objective was to clarify the safety and efficacy of asymmetrical pedicle subtraction osteotomy (PSO) in the treatment of severe adult lumbar deformities prospectively. SUMMARY OF BACKGROUND DATA: Vertebral wedge osteotomy provides good correction of @entity1513 but has rarely been applied to @entity179 . METHODS: A total of 14 @entity1 who had undergone corrective osteotomy were enrolled. The average age at PSO was 67 years (range, 45-76 yr). The minimum follow-up was 2 years. @entity1 questionnaires were administered prospectively. Radiographical parameters including sagittal and coronal balance were analyzed. RESULTS: Average operative time was 310 minutes (range, 254-375 min). Average @entity190 was 1090 mL (range, 700-2900 mL).Mean preoperative lumbar @entity1515 improved from -3   to 42   at the final follow-up, and sagittal balance improved from 12 to 3 cm, respectively. Mean lumbar scoliosis improved from 40   to 12  , and coronal offset improved from 3 to 1 cm, respectively. There was also statistically significant improvement from preoperative to final evaluation in all clinical domains. There were 4 complications: 1 dural tear, 2 hook dislodgements at the cephalad side requiring revision instrumentation, and 1 rod breakage not requiring surgical intervention. Overall, all 14 @entity1 were satisfied with their surgical management and would choose to repeat the procedure. CONCLUSION: Our data suggest that the surgical procedure of asymmetrical PSO is to correct the scoliosis, to restore the lumbar @entity1515 by way of convex-sided posterolateral wedge osteotomy, and may go a long way toward solving the problems of @entity2003 .
