Comparative Study Of Using Three Different Cages In Posterior Lumbar Interbody Fusion

Objective To compare segmental lordosis and disc height at each fused level and total lumbar lordosis, as well as the clinic results of patients undergoing posterior interbody arthrodesis using cylindrical threaded cage (TFC/BAK), rectangular carbon fiber cage (CFRP) or vertical titanium mesh cages supplemented with short-segmented transpedicular screw in the treatment of degenerated lumbar disorders.Methods 118 consecutive patients (130 spinal segments) had undergone single- or two-level lumbar or lumbosacral interbody fusion combined with posterior transpedicular instrumentation for treatmenting degenerated lumbar disease using either cylindrical threaded cages (42 patients,44 segments in Group A), rectangular carbon fiber cages (62 patients,70 segments in group B), or vertically oriented titanium mesh cages (14 patients,16 segments in groupC). Standing lateral lumbar radiographs were measured preoperatively, immediately postoperatively (within 1 week), and latest follow-up for segmental lordosis and disc height at each fused level undergoing posterior interbody arthrodesis and total lumbar lordosis. A comparison was made between three groups among the data of lumbar lordosis angle, height of intervertebral space and segemental lordosis angle preoperatively, postoperatively and latest follow-up respectively. Meanwhile,the clinical results, the fusion rate and complications between three groups postoperative were compared.Results The operation time and amount of bleeding had no significant difference for three groups, There were no significant difference in terms of the rate of improvement JOA score or ODI, the rat of satisfactory clinical results and complications of nervous system for three groups. Nine cases of TFC/ BAK and one case of CFRP subsided into the vertebra to some extent. Preoperative segmental lordosis, height of intervertebral space, and total lumbar lordosis angle had no difference for three groups. The immediate postperative disc height had no difference for three groups.The disc height has significant difference for Group A compared with group B and group C, and there was a significant mean loss for Group A at latest follow-up. Postoperative segmental lordosis was improved for three groups, but there were significant difference for group A compared with group B and group C. There were significant difference for Group A compared with group B and group C, and a significant mean lordotic loss for Group A at latest follow-up. Postoperative improvement of total lumbar lordosis angle had significant difference for Group A compared with group B and group C.Conclusion Supplemented with short-segmented transpedicular screw, posterior lumbar...