Technical note: out-of-plane angular correction based on a trigonometric function for use in two-dimensional kinematic studies.
Am J Phys Anthropol
; 129(3): 399-402, 2006 Mar.
Article
em En
| MEDLINE
| ID: mdl-16323193
ABSTRACT
In two-dimensional (2D) kinematic studies, limb positions in three-dimensional (3D) space observed in lateral view are projected onto a 2D film plane. Elbow and knee-joint angles that are less than 20 degrees out-of-plane of lateral-view cameras generally exhibit very little measurable difference from their 3D counterparts (Plagenhoef 1979 Environment, Behavior, and Morphology; New York Gustav Fisher, p. 95-118). However, when limb segment angles are more than 20 degrees out-of-plane, as is often the case in locomotor studies of arboreal primates, elbow and knee angles can appear significantly more extended than they actually are. For this reason, a methodology is described that corrects 2D out-of-plane angular estimates using a series of trigonometric transformations.
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Base de dados:
MEDLINE
Assunto principal:
Fenômenos Biomecânicos
/
Extremidades
/
Matemática
/
Modelos Teóricos
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article