PMID: 9183030May 1, 1997Paper

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

Journal of Oral Rehabilitation
V F FerrarioG Tartaglia

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 cou...Continue Reading

Citations

Jul 23, 2005·Medical & Biological Engineering & Computing·S MiyaokaY Yamada
Dec 5, 2008·Annals of Biomedical Engineering·Satomi MiyaokaYoshiaki Yamada
Feb 21, 2002·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Virgilio F FerrarioErio Mossi
Sep 17, 2002·Cephalalgia : an International Journal of Headache·F AntonaciG Nappi
Dec 26, 2001·The Journal of Prosthetic Dentistry·V F FerrarioG Serrao
Apr 5, 2000·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·D DeanK Subramanyan
Jun 23, 2001·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·J M OkkerseW H Wolters
Feb 12, 2000·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·V F FerrarioG Serrao
Aug 29, 2003·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·Virgilio F FerrarioArmando Carù
Sep 9, 2004·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·Seth M WeinbergMary L Marazita
Nov 2, 2004·The Cleft Palate-craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association·Jill E WhiteArup Ray
Oct 30, 2016·Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons·Ming Yin LeungYiu Yan Leung
Apr 24, 2003·Journal of Dental Research·J L ZeredoK Soma
Aug 8, 2021·International Journal of Environmental Research and Public Health·Paulina GolanskaMonika Lukomska-Szymanska

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