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A three-dimensional non-invasive study of head flexion and extension in young non-patient subjects.

Abstract：

:Head flexion and extension movements near the natural head position (NHP) were analysed for the location of the mean instantaneous centre of rotation (ICR). Forty-six healthy young adults (30 women and 16 men) with sound dentitions, free from cranio-cervical disorders, performed habitual movements that were automatically detected and measured by an infrared three-dimensional motion analyser. ICR and curvature radius were calculated for each movement and subject. In both extension and flexion, ICR position changed during the motion. The movement was symmetrical in all subjects. No gender or flexion/extension differences were found for both ICR position and relevant curvature radius. On average, ICR relative to NHP soft-tissue nasion was located at about 150% of the soft-tissue nasion-right tragus distance, with an angle of about 220 degrees relative to the true horizontal. Results suggest that head flexion or extension is always performed with a combination of rotation (atlanto-occipital joint) and translation (cervical spine) even in the first degrees of motion. Moreover, NHP at rest seems to be some degree more flexed and anterior than head position during movements. These relative positions and their muscular determinants could also influence mandibular posture at rest and during functional movements.

journal_name

J Oral Rehabil

journal_title

Journal of oral rehabilitation

authors

Ferrario VF,Sforza C,Poggio CE,Schmitz JH,Tartaglia G

doi

10.1046/j.1365-2842.1997.d01-300.x

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

361-8

issue

5

eissn

0305-182X

issn

1365-2842

journal_volume

24

pub_type

杂志文章

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