Influence Of Lumbar Facet Joint Degeneration On Vertebral Three-dimensional Motion In Physical Load Condition

Background:With the recognition and study of scholars about lumbar facet joint,the study in motion and mechanics of lumbar facet joint already have became a hot issue.However,the biomechanical research of lumbar facet joint was rarely reported.What's more,the research method is always limited in cadaveric specimens,2D measurement and finite element analysis.Therefore,we aim to explore the three-dimensional motion and biomechanics of lumbar vertebral with facet joint degeneration under physiological loads via to new methods which are dual fluorescence imaging system and 2 dimensions to 3 dimensions.Methods:The new technology of DFIS and 2D-3D were used to simulate in vivo 3D motion of lumbar vertebrae under 7 functional positions(accuracy 0.3mm/0.7°).Then,the age and gender was analyzed among normal facet joint,degenerative facet joint and severe degenerative facet joint via to statistical analysis.Additionally,the degree of motion also was analyzed among normal facet joint,degenerative facet joint and severe degenerative facet joint by statistical analysis.Result:Via to analysis of one-way ANOVA and Chi-square test,the result displayed that the age of normal group case was obviously different compared to case of severe degenerative facet joint(P<0.05,Table 2),showed that gender was non-different among three group(P>0.05,Table 2).Then,the descriptive statistical was used to assess 3D motion,we discovered that the left-right displacement of lumbar vertebrae significantly larger than other displacement and rotation angle of Z-axis of lumbar vertebrae significantly larger than X or Y-axis under position of rotation(Table 3),found that the left-right displacement of lumbar vertebrae significantly larger than other displacement and rotation angle of Y-axis of lumbar vertebrae significantly larger than X or Z-axis under position of left-right side bend(Table 3),and discovered that the before-after displacement of lumbar vertebrae significantly larger than other displacement and rotation angle of X-axis of lumbar vertebrae significantly larger than Y or Z-axis under position of bend backwards(Table 3);Finally,the 3D main motion was analyzed by two-way ANOVA,the main rotation angle of Z-axis of lumbar vertebrae in normal group was different to group of Severe degenerative facet joint under position of left-right rotation(Fig 8,9,10),the main left-right displacement of lumbar vertebrae in normal group was different to group of Severe degenerative facet joint under position of left-right side bend(Fig 8,9,10)and the main rotation angle of X-axis and main before-after displacement of lumbar vertebrae in normal group was different to group of Severe degenerative facet joint under position of bend backwards(Fig 8,9,10)Conclusion:A main dimension displacement,a main dimension rotation angle,two secondary displacement and two secondary rotation angle are made of 3D motion of lumbar vertebrae under different functional positions.Severe degenerative facet joint may reduce main rotation angle of Z-axis of lumbar vertebrae under position of left-right rotation,decrease main left-right displacement lumbar vertebrae under position of left-right side bend,and lessen main rotation angle of X-axis and main before-after displacement of lumbar vertebrae under position of bend backwards The data and results in this study will provide a theoretical basis for biomechanical research of lumbar facet joint degeneration.