Richard A Lazenby

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The hypothesis that functional adaptation of joint surfaces to mechanical loading occurs primarily through change in mass, density, and structure of subarticular trabeculae (the "articular constraint" model) is investigated through an analysis of directional asymmetry among three separate bone compartments in the human second metacarpal. Measures of(More)
This study tests the effect of bilateral asymmetry on the success rate of correct prediction of sex based on osteometric dimensions of the second metacarpal, using a method proposed by Scheuer and Elington. A total of 351 bones from 179 individuals (47 documented as to age and sex), including 172 pairs, obtained from a 19th century cemetery were used to(More)
Micro-computed tomographic analyses of trabecular bone architecture have been used to clarify the link between positional behavior and skeletal anatomy in primates. However, there are methodological decisions associated with quantifying and comparing trabecular anatomy across taxa that vary greatly in body size and morphology that can affect(More)
The past decade has witnessed the (re)emergence of a debate as to whether handedness is apomorphic within hominins. There are both qualitative and quantitative arguments, some which draw non-human primates into the handed sphere and others which exclude them. Ultimate questions concern origins of structural asymmetry of both brain and body and lateralized(More)
Study of bone mass at the second metacarpal midshaft has contributed to our understanding of skeletal growth and aging within and between populations and has relied extensively on noninvasive techniques and in particular radiogrammetric data. This study reports age, sex, and side variation in size and shape data acquired from direct measurement of(More)
RATIONALE AND OBJECTIVES Radiogrammetry of the second metacarpal assumes a circular or elliptical model, which does not conform to reality. This study assesses the degree of bias and limits of agreement (error) resulting from deviations from these assumed models for estimates of bone mass and strength. METHODS Forty-six left metacarpals were radiographed(More)
It is generally presumed that compensation for the reduction of bone strength by progressive endosteal bone loss in adults is provided by continuing periosteal apposition (CPA) of new lamellar bone. However, the appropriate magnitude of compensatory bone growth, and the parameters that operate to determine that magnitude, are unknown. This paper examines(More)
It has been argued that techniques for estimating adult age-at-death from cortical histology are deleteriously affected by sampling location. This study uses nine complete femoral midshaft cross-sections to test the effect of sampling site on measurement of a standard histological variable, percent remodeled bone. Circumferential periosteal fields from four(More)
Traditional radiogrammetry of the second metacarpal midshaft reconstructs cortical cross-sectional geometry from mediolateral (ML) linear dimensions based on circular model. However, comparison of anteroposterior (AP) versus mediolateral radiographic dimensions in a sample of paired metacarpals shows that AP total and medullary widths typically exceed ML(More)
Continuing periosteal apposition (CPA) of small amounts of new lamellar bone, leading to absolutely larger size, has been identified in a number of adult cranial and postcranial bones. This paper reviews 42 studies published since 1964 that have found both significant and nonsignificant age-related change in various skeletal size dimensions, e.g., length,(More)