Anatomical measurement and clinical significance of anterior transarticular screw fixation

[Objective]To provide Chinese morphological data for anterior C1、2 transarticular screw fixation.[Method]With a digital vernier and a goniometer made in China,the anatomic parameters related to anterior C1、2 transarticular screw fixation were measured from 50 pairs of dried Chinese adult human C1 and C2 vertebrae.[Result]In the anterior transarticular screw fixation,the lateral angulation of the screw tract to the sagittal plane ranged from(10.8±2.10)° to(25.13±3.12)°,the posterior anguation to the coronal plane from(8.85±2.12)° to(26.96±3.09)°,the screw tract length was from(17.48±2.1) mm to(25.4±2.59)mm,the distance from medial part of C2 foramen to the middle of C2 body was(14.12±1.28)mm.[Conclusion]It is optimal for the anterior C1、2 transarticular screw fixation to place the anterior C1、2 transarticular screw with the length of 17 mm to 25 mm in lateral angulation ranged from 10° to 25° and the posterior angulation ranged from 9° to 27°.During the procedure,the dissecting distance from the middle of C2 to lateral should not exceed 14 mm.