Comparison of mechanical motion profiles following instrumented fusion and non-instrumented fusion at the L4-5 segment

Ho Joong Kim, Seong Hwan Moon, Heoung Jae Chun, Kyoung Tak Kang, Hak Sun Kim, Eun Su Moon, Jin Oh Park, Byung Yoon Hwang, Hwan Mo Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Purpose: To investigate the difference in motion profiles between instrumented and non-instrumented fusion of the lumbar spine.. Method: In vivo retrospective radiological analysis of dynamic (flexion-extension) lateral plain films was performed in different lumbar spine fusion types. Twenty-eight patients underwent lumbar fusion surgery at the L4/5 level. Fourteen patients underwent anterior fusion surgery without implantation, and the others underwent posterior instrumented fusion. Segmental angular motion was measured at the fused and adjacent levels using dynamic plain lateral film 2 years after operation. Results: The anterior uninstrumented fusion group showed mean 2.0° of segmental angular motion at the fused level compared with mean of 0.8° in the posterior instrumented fusion group (P<0.05). In contrast, at the proximal adjacent level, decreased angular motion (mean 7.7°) was noted in the anterior uninstrumented fusion group compared with mean 11.6° in the posterior instrumented fusion group (P<0.05). Conclusion: This study suggests that differing stiffness of fusion segments could cause different mechanical motion profiles at adjacent segments.

Original languageEnglish
Pages (from-to)E64-E69
JournalClinical and Investigative Medicine
Volume32
Issue number1
Publication statusPublished - 2009 Feb

All Science Journal Classification (ASJC) codes

  • Medicine(all)

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