การวัดเพื่อประเมินค่าบริเวณส่วนหลังด้านข้างของกระดูกสันหลังส่วนคอสำหรับการใส่สกรูยึดในคนไทย / ศศิศ สินกีรติโรจไพศาล = Morphometric evaluation of posterior lateral mass of cervical spine for posterior lateral mass screw placement in Thai / Sasid Singreratiroachpisan
This study evaluated the safety data for posterior lateral mass screw placement (C3-C7) in Thai. The objective of this study is measure the distance and angle for posterior lateral mass screw. Methods: Fitty dried cervical spine from C3 to C7, were 31 male and 19 female. Side and sex differences were evaluated separately. Anatomic evaluation focused on distance from the posterior midpoint of the cervical lateral mass (D4) to posterior border of the transverse foramens (D2) and the intervertebral foramens (D3) the angle between the parasagittal plane and the line connecting the posterior midpoint of the lateral mass with the lateral limit of the transverse foramens (A1). The average superior angle (A4) is the mean angle of the superior articular facets (A2) and the inferior articular facets (A3) with the line connecting between the posterior border of the superior articular facets and the inferir articular facets. The mean, range, standard deviation and 95% confidence of each measurement were evaluated. The increase average from C3-C7 is D4 found lowest value in C3 have range 5.1 mm. for male and 5 mm. for female and found highest value in C7 have range 5.9 mm. for male and 5.8 mm. for female, D3, found lowest value in C3 have range 11.8 mm. for male and 10.6 mm. for female and found highest value in C7 have range 14.2 mm. for male and 13.9 mm. for female and A1 angle in media angle found lowest value in C3 have range +6 ํ for male and +5.2 ํ for female and found highest value in C5 have range +6.3 ํmm. for male and +5.5 ํ for female in lateral angle found lowest value in C7 have range -9.4 ํ for male and -8.9 ํ for female and found highest value in C6 have range -6.4 ํ mm. for male and -5.4 ํ for female. The decrease average from C3-C7 is D2, found lowest value in C7 have range 10.2 mm. in both sex and found highest value in C3 have range 11.8 mm. for male and 11.5 mm. for female, A4 angle found lowest value in C7 have range 10.8 ํ for male and 8.6 ํ for female and found highest value in C3 have range 43.9 ํ mm. for male and 42.5 ํ for female. Conclusions : This present study indicated that there is no risk of damaging the vertebral arteries and cervical nerve roots if a screw is directed perpendicular to the posterior aspect of the lateral mass in C3-C7. Therefor the medial angle of C3 to C5 were 0 ํ to +2 ํ for female and 0 ํ to 4 ํ in male, superior angle were 31 ํ to 39 ํ for female and 35 ํ to 40 ํ for male, screw length less than 8 mm. for female and less than 9 mm. for male. The lateral angle of C6 were less than -4 ํ for female and less than -5 ํ for male, superior angle were 23 ํ to 35 ํ for female and 25 ํ to 36 for male, screw length less than 10 mm. in both specimen. The C7 lateral angle were less than -5 ํ for female and less than -6 ํ for male, superior angle were 3 ํ to 15 ํ for female and 7 ํ to 11 ํ for male, screw length less than 11 mm. in both sex
