Objective To provide theoretical basis for the design of new double threaded pedicle screws, by measuring the anatomical parameters of cervical vertebrae in normal people. Methods A total of 100 healthy individuals were collected and the cervical spine CT scan were completed. The length of bilateral pedicle screw insertion path (including intra-vertebral length, pedicle length, and vertebral plate length, as reference for pedicle screw length design), insertion abduction angle, and width and height of pedicle isthmus (as reference for pedicle screw diameter design) of C3~7 on CT scan. The mean value and quartile of each measurement result were calculated. Results Basic information of 100 adult healthy volunteers, including height, age, weight, and comorbidities, including 54 males and 46 females, with an average age of 35.95 years were recorded. From the CT scan of C3~7, there was no statistical difference between the left and right sides of each parameter (P>0.05). There was no statistical difference in male and female (P>0.05). The average length of the vertebral body in the lower cervical pedicle screw insertion path was (15.85±1.20)~(19.40±1.50) mm. The average length of the pedicle was (5.42±1.06)~(6.03±0.84) mm. The average length of the vertebral lamina was (9.52±1.15)~(10.33±1.58) mm. The average range of nail insertion and abduction angle was (39.82±2.53) °~(42.56±2.50) °. The average width of the pedicle isthmus was (5.84±0.87)~(7.10±1.05) mm. The average height of the pedicle isthmus was (6.71±1.10)~(8.26±1.22) mm. Conclusions The measurement of the anatomical parameters related to C3~C7 pedicle screw fixation in normal people provides theoretical basis for the design of a new type of double-threaded pedicle screw.
Key words
Lower cervical vertebra; /
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Anatomical measurement; /
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Double- threaded pedicle screw
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