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Titolo:
2ND METACARPAL CROSS-SECTIONAL GEOMETRY - REHABILITATING A CIRCULAR ARGUMENT
Autore:
LAZENBY RA;
Indirizzi:
UNIV NO BRITISH COLUMBIA,ANTHROPOL PROGRAM PRINCE GEORGE BC V2N 4Z9 CANADA
Titolo Testata:
American journal of human biology
fascicolo: 6, volume: 10, anno: 1998,
pagine: 747 - 756
SICI:
1042-0533(1998)10:6<747:2MCG-R>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORTICAL BONE LOSS; 2ND METACARPAL; POSTCRANIAL ROBUSTICITY; BILATERAL ASYMMETRY; WOMEN; AGE; ABSORPTIOMETRY; RADIOGRAMMETRY; SIZE; HOMO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
R.A. Lazenby, "2ND METACARPAL CROSS-SECTIONAL GEOMETRY - REHABILITATING A CIRCULAR ARGUMENT", American journal of human biology, 10(6), 1998, pp. 747-756

Abstract

Radiogrammetry of the second metacarpal has long served as a measure of normal and abnormal bone growth and aging, functional asymmetry, and fracture risk in osteoporosis. The method relies on algebraic interpretation (circular or elliptical models) of uni- or biplanar radiographic images. This paper tests the conformance of these models with actual measures of metacarpal geometric variation in a sample of 356 bonesfrom an historic archaeological sample. Both the circular and elliptical models significantly over-estimate actual values for all variables(e.g., total area (3.05% and 9.42%, respectively) and cortical area (7.25% and 12.25%), bending rigidity about the mediolateral (13.88% and20.92%) and anteroposterior axes (17.35% for the elliptical model). The greater degree of systematic bias found for the elliptical model iscontrary to results of an earlier study (Lazenby, 1997), and suggeststhat sample composition can influence the method error associated with a particular approach. The import of radiogrammetric bias will depend on the degree of shape variation among samples compared (e.g., left,vs right, male vs female, etc.), which in most cases cannot be predetermined. Consequently, reduced major axis equations were derived from regressing actual on estimated values for total area (TA), cortical area (CA) and two measures of bending rigidity (Ix, Iy) in order to permit adjustment for radiogrammetric error associated with these algebraic models. Application of these formulae to a hold-out sample showed nosignificant differences between actual and predicted values. (C) 1998Wiley-Liss, Inc.

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Documento generato il 26/09/20 alle ore 12:08:18