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A Morphometric study of the Cervical Vertebral Pedicles and its Clinical Significance

Yang Daiyun;Wang Yue;Li Liangwen Department of Anatomy,Sichuan Continuing Education college of Med.Sets./Chengdu 610041 Department of Orthopaedics,Sichuan people's Hospital.Chengdu 610072  
A morphometric study was made on the C,-T1 vertebral pedicles and their relative structures in 20 adult dry vertebrae columns,in order to obtain the anatomical data for the design of the pedicle screw and the method of the internal fixation.The heights.widths and lengths of these vertebral pedicles were 6.4±1.1mm~9.1±1.3mm.3.6±1.8~7.2±1.3mm and 9.6±1.4mm~15.1±1.2mm respectively.The pedicle angles were 26.2±6.0 degree~46.0±3.5 degree on the transverse plane and 90.7±2.3 de gree~105.6±4.6 degree on the sagittal plane.On the basis of these data.the pedicle screw designed within 3mm diameter may be safe,and the dimension of the designed screw length may not be shorter than 15.1±1.2mm and not longer than 29.1±1.4mm.The entering point of the screw on the column of the articular process may be located with the PS and PM values.The direction of the progressing screw may be determined with the values of the pedi cle angle on the transverse and sagittal planes.
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