枢椎椎弓根螺钉固定可行性的CT测量研究

Computed tomography study of the anatomic feasibility of C_2 pedicle screw placement

目的:探讨枢椎椎弓根螺钉固定的可行性,为临床应用提供依据。方法:利用CT扫描50例干燥枢椎标本,测量枢椎椎弓根上缘、下缘和中部的宽度以及椎弓根的内、外缘高度。结果:椎椎弓根的上缘宽度为(7.67±1.33)mm,所有标本均大于5.0mm;中部宽度平均(5.75±1.59)mm,19%小于5.0mm;下缘宽度平均(3.87±1.09)mm,84%小于5.0mm。枢椎椎弓根的缘高度平均(5.66±1.43)mm,40%小于5.0mm;内缘高度平均(8.80±0.74)mm,所有标本均大于5.0mm。结论:国人中约81%的患者适合进行枢椎椎弓根螺钉固定,术前CT扫描可明确个体的置钉可行性。

Objective： To evaluate the anatomic possibility of C2 pedicle screw placement by computed tomography measurements. Methods： Fifty dry axis specimens were underwent CT scan to measure anatomic data dealing with C2 pedicle screw placement technique, including the width of superior surface, mid-portion and inferior surface of the C2 pedicle, the height of internal and external surface of the C2 pedicle. Results： The superior width of C2 pedicle was averagely about 7.67±1.33 mm, larger than 5.0 mm in all specimens; the mean mid-portion width was 5.75±1.59 mm, 19% of specimens were lower than 5.0 mm; the averaged inferior width was 3.87±1.09 mm, 84% of specimens were lower than 5.0 mm. The mean external height of C2 pedicle was 5.66±1.43 mm,40% of specimens were lower than 5.0 mm; the internal height of C2 pedicle averaged 8.80±0.74 mm, and larger than 5.0mm in all specimens. Conclusions： It is quite possible to place pedicle screws on axis, and the present screw fixation technique was suitable to 81% Chinese patients, while preoperative CT scans could judge the anatomic suitability of individual patient.