Comparative study of two different intervertebral body fusion in treating lumbar disc herniation

Abstract

Objective To explore the clinical efficacy of pedicle screws-cod fixation plus single cage with autogenous bone and double cages implantation in treating lumbar disc herniation (LDH).Methods Ninety eight patients with LDH treated with posterior pedicle screw fixation and followed for more than two years were reviewed retrospectively from January 2006 to May 2011.All patients were divided into two group A (single cage interbody placement plus autogenous bone graft) and group B (double cages interbody placement) based on interbody fusion method.The volume of blood lose,clinical effect and imaging outcome of the two groups were compared.Results The blood lose during operation of group A was (203.5 ± 15.2) ml,while (405.2-± 17.3) ml of group B,and there was obvious difference of them (P ＜ 0.05).92.8％ cases of group A obtained excellent and good effect,while 92.6％ of group B did so.The fusion rate of group A was 95.45％,and group B reach to 94.23％.There was no diffence between them (P ＞ 0.05).At the 7th day after operation,the average intervertebral height of group A was (11.2 ± 1.2) mm,and those of group B was (11.1 ± 1.5) mm.Two years later,the average intervertebral height of group A was (11.0 ± 1.2) mm,while those of group B was (11.0 ± 1.5) mm.There was no difference between the two groups in intervertebral fusion rate and change of intervertebral height (P ＞ 0.05).Conclusion Based on posterior pedicle screw fixation,single or double cages interbody placement could achieve high rate of intervertebral fusion,rare change of intervertebral height and excellent therapeutic effect.However,internal fixation with single cage and autogenous undergo less fare and volume of blood lose. Key words: Lumbar disc herniation; Cage; Interbody fusion