乙状窦后入路两种骨性标志定位与 静脉窦关系的比较.

Objective To explore the accuracy between the two kinds of bone landmarks (mastoid root trailing edge and asterion) and venous sinus relationship in retrosigmoid approach. Methods 30 cases randomly divided into group A ( asterion) and group B ( mastoid root trailing edge) ,measured the key hole center to the edge of the transverse sinus distance (vertical distance) and the sigmoid sinus inside edge distance ( horizontal distance), and compared horizontal and vertical distance of two groups respectively. Results In group B, the average vertical distance between the key hole and the transverse sinus was (4. 6 ± 1.2 mm)，significantly less than group A (8.3 ± 2.7 mm), the difference was statistically significant (P < 0.05), meanwhile, the average horizontal distance (2.8 ± 1.1 mm) in group B was much shorter than in group A (5.6±2.1), the difference was statistically significant (P < 0.005) . Conclusion Osseous key hole accurate position in mastoid root trailing edge ( group B) is better than asterion ( group A) . It has certain guiding significance and reference value to expose transverse and sigmoid sinus transition in retrosigmoid approach. [ABSTRACT FROM AUTHOR]