Moment-rotation relationships of the ligamentous occipito-atlanto-axial complex

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Goel, V. K.¹; Clark, C. R.¹; Gallaes, K.¹; Liu, Y. King¹

Moment-rotation relationships of the ligamentous occipito-atlanto-axial complex

J Biomech. 1988;21(8):673-680

© Pergamon Press plc

Affiliations

¹Department of Biomedical Engineering, University of Iowa, Iowa City, IA 52242, USA

²Department of Orthopaedics, University of Iowa, Iowa City, IA 52242, USA
Abstract

The 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° and 23.3° 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.
Links

DOI: 10.1016/0021-9290(88)90204-7

PubMed: 3170621

WoS: A1988P699700005
History

Received: 1987-06-26

Cited Works (5)

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