Anatomic Research of the Safe Space Between the Cervical Uncinate Process and the V2 Vertebral Artery

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StudyDesign Retrospective study Objective To observe and measure the safe distance between the uncinate process (UP) and the V2 vertebral artery (VA). MethodsTwo hundred and sixteen patients who underwent head and neck CTA date were selected and measured. The Upper Tip (UT) of the UP, the Posterior Tip (PT) of the UP and the Center of the VA (CA) were identified. Then, the width between the UT and the CA (WUA), the depth between the UT and the CA (DUA), the distance between the UT and the CA (LUA) were measured. Meanwhile, the width between the PT and the CA (WPA), the depth between the PT and the CA (DPA) and the length between the PT and the CA (LPA) were measured. The values above were compared between the left and right sides of the same vertebral body, also the results of the same side from C3 to C6 were compared. ResultsThat WUA fluctuates between 6.1- 4.4 mm on the left side with the narrowest at C5 and C6 (4.4 mm), 6.5- 4.6 mm on the right side with the narrowest at C5 (4.6 mm). It could be concluded that the safe space for operation outside UP is about 4mm and more care should be taken when operating on the caudal spine. WPA fluctuates between 10.6- 10.0 mm on the left side with the narrowest at C3 (10mm), 11.0- 9.9 mm on the right side with the narrowest at C4 (9.9 mm). The safe space for operation outside the PT is about 10mm and more care should be taken when operating on the cephalad spine. DPA fluctuates between 6.5- 4.6 mm on the left and is narrowest at C3 (4.6 mm), 6.5- 4.7 mm on the right and narrowest at C3 (4.7 mm). The safe space for operation from the PT to the ventral side is about 4.5 mm, and more care should be taken when operating on the cephalad side of the cervical spine. ConclusionUP and PT could be seen as the landmarks in the operations of ACDF. The safe space outside UP is about 4mm and more care should be taken when operating on the caudal spine. The safe space outside PT is about 10mm and more care should be taken when operating on the cephalad spine. The safe space for operation from the PT to the ventral side is about 4.5 mm, and more care should be taken when operating on the cephalad side of the cervical spine.