CT MPR diagnosis of the lumbar spondylolysis

Objective: To study the MPR diagnosis of the lumbar spondylolysis.Material and Methods:CT scan and MPR performed in 10 cases with spondylolysis,obtained the sagittal reconstruction imaging.We also studied 3 cadaver specimen lumbar spines,obtained as blocks of tissue,and scanned in the sagittal and axial planes with CT,then the MPR imaging were performed with axial imagings,and the cadaver lumbar spine blocks were anatomized.The reformated sagittal imaging were correlatively with the direct sagittal scan imaging.Results:The isthmus and superior articular process and inferior articular process and pedicle of vertebral arch showed in the same direct sagittal scan imaging very clearly.Despite the reconstruction sagittal imagings cannot be evaluation as well by direct sagittal scan imaging.The informations of the direct sagittal scan can be displayed on reconstruction sagittal imaging.In 10 cases with lumbar spondylolysis,nine of them were single lumbar vertebral,one of them was two lumbar vertebrals.The shape and angle of the fissure of spondylolysis can be showed very clearly.Conclusion: Sagittal reconstruction can completely display the isthmus of vertebral arch and the features of spondylolysis in detail.