Comparision of Two Different Methods of Lumbar Interbody Fusion with Pedicle Screw Fixation for Lumbar Instability

Abstract：Objective To investigate the clinical efficacy of the two different methods of interbody fusion for lumbar insta-bility and to compare their respective advantages and disadvantages. Methods From June 2012 to June 2013,64 patients with lumbar instability underwent pedicle screw fixation using two different bone grafts. Of 64 patients,40 received bone graft impac-tion with lumbar interbody fusion,and 24 received interbody fusion cage. Postoperative intervertebral height changes,JOA score,clinical curative rate and fusion rate index were recorded and compared. Results All patients were followed up,the fol-low-up time ranged from 16 to 28months,average 23 months The intervertebral space heights were significantly improved in 2 groups at immediately after operation and last follow-up compared with those before operation(P < 0. 05). Compared with the immediate postoperative,lumbar interbody fusion group was significantly less than the impaction bone grafting group,the differ-ence was statistically significant(P < 0. 05). There was no significant difference in JOA score in two groups before operation. (P > 0. 05). At the time of the last follow-up,both groups of JOA scores were decreased significantly. In one year after opera-tion,X-ray film showed that the fusion rate of the interbody fusion cage group was significantly higher than that of the impaction bone grafting group. Conclusion There is no significant difference in the clinical efficacy between bone graft impaction and bone graft impaction in the treatment of lumbar with pedicle screw fixation. In order to obtain better treatment effect,it is neces-sary to select appropriate method according to the specific condition of patients.