Wongthawat Liawrungrueang, K. Daniel Riew, Nantawit Sugandhavesa, Torphong Bunmaprasert


September 2022, pp 1 - 9 Original Article Read Full Article 10.1007/s00586-022-07385-7

First Online: 19 September 2022

Purpose

To compare the Atlas (C1) lateral mass screw placement between screw trajectories of 0° and 15° medial angulation while using the intersection between lateral mass and inferomedial edge of the posterior arch.

Methods

Forty-eight Atlas lateral masses were prepared and divided into 2 groups: Group 1; screws inserted at 3 mm lateral to the reference point with screw trajectory of 0° angulation(N = 24) and Group 2; those inserted with screw trajectory of 15° medial angulation(N = 24). We evaluated the atlas anatomy, screw purchase and the presence of any breaches using CT scan.

Results

The radiographic parameters for Groups 1 and 2 were found statistically different (p-value 

Conclusion

A starting point of 3-mm lateral to the intersection between lateral mass and inferomedial edge of the Atlas posterior arch can be safely and effectively used to insert C1 lateral mass using both 0° and 15° medial angulation.


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