Radiographic Research Of The Locking Axial Lumbosacral Interbody Fusion

Objective： Through statistical measurement and data analysis of thelumbosacral spine CT imaging, this study aims to evaluate the length、size of the partsof lumbar sacral vertebra lock axial fusion device, lock hole position andpercutaneous pedicle unilateral locking nail placement angle, and also to providedevice design and surgical reference for the locking axial lumbosacral interbodyfusion.Material and Methods：200patients，data of lumbosacral64-slice spiral CTslice were randomly selected from department of radiology of the first affiliatedhospital of University of South China. The patients were from outpatient departmentor inpatient department, Male100, female100with age from18to60years old. Thepatients with Lumbosacral caudal abnormality are excluded from the study. It includescongenital mutation, deformity, tuberculosis, tumors, trauma, severe degeneration, etc.The scanning layer distance is2mm, then measurement data were calculated in themachine of computer three-dimensional reconstruction (Philip Brilliance WorkspaceVer.2.0.1).Measurement data of the lumbar5sacral1vertebrae in the softwareplatform. It includes these data: the side width of L5vertebral body (Line AB)、theside width of S1vertebral body at the plane of locking point (Line DE)、the distancebetween the upper and lower endplate of L5vertebral body along a fixedbaseline(Line GH)、the distance between the L5vertebral locking point to the lowerendplate of L5vertebral body along the fixed baseline (Line CH)、the height of L5/S1disc along the fixed baseline (Line HI)、the distance between the S1vertebrallocking point to the sacrum bottom along the fixed baseline (Line IF)、the distancebetween the sacrum bottom and the sacral surface along the fixed baseline (Line IJ)、The angle between L5pedicle locking nail and axial fusion implement at the sagittal(Angle α)、The angle between S1pedicle locking nail and axial fusionimplement at the sagittal(Angle β)、the best abduction angle of L5pedicle lockingnail(Angle γ)、the best abduction angle of S1pedicle locking nail(Angle δ). The datawere collected by two consequent measurements in a computer withthree-dimensional reconstruction software platform at the same level.Results：There were significant differences between the male and female groupin all parameters except Line H I、Angle α、Angle β、 Angle γ、Angle δ.There weresignificant differences between Line AB and Line DE in the same group. The maleand female’s95%group reference range of LineDE、 LineCH、 LineGH、 LineIF areRespectively26.90～35.50mm、22.30～30.27mm、14.00～19.19mm、8.46～12.53mm and24.73～31.18mm、21.38～27.74mm、13.19～17.74mm、8.17～11.50mm.The male andfemale’s95%group reference range of LineHI is4.31～11.43mm. The95%confidenceinterval of Angleα、Angleβ、Angleγ、Angleδare79.3～80.3o、103.9～104.8o、54.2～55.3o、70.1～71.8o。Conclusion：The research exhibited that it can be used for adult people with thelocking axial lumbosacral interbody fusion. The result of statistics can provide usefulreference for device design and surgical guidance for the locking axial lumbosacralinterbody fusion.