PMID: 8983110Jan 1, 1996Paper

Magnetic resonance angiographic analysis of atlanto-axial rotation: anatomic bases of compression of the vertebral arteries

Surgical and Radiologic Anatomy : SRA
J L DumasJ P Chevrel

Abstract

The aim of this study was to identify the functional anatomic factors involved in the maintenance or disturbance of flow in the vertebral aa. during atlanto-axial rotation. Fourteen healthy volunteers were studied by magnetic resonance angiography (MRA) by a three-dimensional sequence in phase contrast centered on the vertebral aa. at the level of the cranio-cervical junction before and after left rotation of the head. A decrease in the signal intensity of the arterial flow was sought for. The results were compared to the posterolateral development of the loop of the vertebral a. in its atlanto-axial segment in neutral position, and to the measurement of the angular opening between the atlas and axis in dynamic position. Seven subjects also had a three-dimensional CT study (3D CT) of the bony relations of C1 and C2 after rotation. In 4 subjects a disturbance of flow in the right vertebral a. was observed in the transverse foramen of C2. This occurred when two factors were combined: an under-developed atlanto-axial arterial loop and a C1-C2 angle exceeding 35 degrees in maximal rotation. In the other subjects a well-developed arterial loop and/or a C1-C2 angle of less than 35 degrees in maximal rotation were factors preserving t...Continue Reading

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Citations

Feb 17, 2001·Journal of Clinical Ultrasound : JCU·M Haynes, N Milne
Dec 21, 2006·Surgical and Radiologic Anatomy : SRA·Shaoyin DuanJianghe Kang
Dec 20, 2000·Ultrasound in Medicine & Biology·M J HaynesJ McGeachie
Jun 4, 2010·International Journal of Clinical Practice·E Ernst
Jul 15, 2015·Journal of Pediatric Neurosciences·H S NandishA K Mahapatra
Dec 6, 2002·Journal of Manipulative and Physiological Therapeutics·Michael J Haynes
Sep 6, 2002·Journal of Manipulative and Physiological Therapeutics·Thomas C Michaud

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