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Journal of biomechanics · Jan 1988
Moment-rotation relationships of the ligamentous occipito-atlanto-axial complex.
- V K Goel, C R Clark, K Gallaes, and Y K Liu.
- Department of Biomedical Engineering, University of Iowa, Iowa City 52242.
- J Biomech. 1988 Jan 1; 21 (8): 673-80.
AbstractThe relationships between applied pure moments at the occiput (C0) and the resulting rotations at the atlanto-occipital (C0-C1) and atlanto-axial (C1-C2) joints are quantified. In axial twist, with a moment of 0.3 Nm, a mean rotation of about 2.5 degrees and 23.3 degrees was observed at C0-C1 and C1-C2 units respectively. Both the atlas and axis contributed to produce lateral bending motion. The ratio between extension and flexion rotations at C0-C1 was 2.5:1. Lateral bending and axial rotations were strongly coupled to each other. The occipito-atlanto-axial complex exhibited a large 'neutral zone' compared to lower cervical spine segments. The likely clinical significance of these findings are discussed.
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