Abstract
Pathophysiological conditions can modify the skeletal chemical concentration. This study analyzes the elemental composition in two anatomical regions from dry femoral bone using a portable X-Ray Fluorescence (pXRF) and evaluates its impact in the bone mineral density (BMD). The left femora of 97 female skeletons (21–95 years old individuals) from the Coimbra Identified Skeletal Collection were studied. Diagenetic biases were discarded at the outset and BMD was determined with Dual-energy X-ray absorptiometry. Chemical measurements were performed at the midpoint of the femoral neck and at the midshaft using a pXRF device, and comparisons were made considering the age and the BMD values. Only elements with a Technical Measurement Error ≤ 5% were selected: P, S, Ca, Fe, Zn, As, Sr, Pb and the Ca/P ratio. Statistically significant differences were found between regions, with higher concentrations of P, Ca, Zn and S at the midshaft, and the Ca/P ratio at the femoral neck. The concentration of P is higher in individuals < 50 years, while S and Ca/P ratio increase in individuals ≥ 50 years. The decrease of P with age can be simultaneously related to the decline of its concentration in osteoporosis. Decreased BMD is also associated with higher levels of S and Pb. Osteoporosis enhances the absorption of osteolytic elements in specific locations. This fast and non-destructive technique has proved effective for the comprehension of chemical changes related to bone mass loss. This study highlights the potential of identified skeletal collections to improve the knowledge about bone fragility.
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Abbreviations
- pXRF:
-
Portable X-Ray Fluorescence
- BMD:
-
Bone mineral density
- rTEM:
-
Relative technical measurement error
- DXA:
-
Dual-energy X-ray absorptiometry
- OP:
-
Osteoporosis
- CSIC:
-
Coimbra Identified Skeletal Collection
- s.d.:
-
Standard deviation
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Acknowledgements
This study was supported by the ERASMUS+ internship [SZ] performed in the Research Centre for Anthropology and Health (CIAS: PEstOE/SADG/UI0283/2020) at the University of Coimbra and the FCT-Fellowship SFRH/BD/115691/2016 [AMC]. The authors express their gratitude to the Department of Life Sciences and to Sofia Wasterlain for authorizing the study of the identified skeletal collection, to the Department of Earth Sciences, Geosciences Center (CGeo) for the use of the pXRF device, and to Carlos Martínez-Toledano for the achievement of the illustrations. The authors also acknowledge the editorial board members and the two anonymous reviewers who improved the content of this paper through their suggestions and comments.
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FCT-Fellowship SFRH/BD/115691/2016 [AMC], Erasmus + Program [SZ].
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SZ, AMC and ALS designed research and analyzed data. LC and FC performed research and analyzed data. SZ and AMC wrote the manuscript and SZ, AMC, LC, FC and ALS edited the manuscript.
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Sofía Zdral, Álvaro M. Monge Calleja, Lidia Catarino, Francisco Curate, and Ana Luisa Santos declare that they have no conflict of interest.
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Zdral, S., Monge Calleja, Á.M., Catarino, L. et al. Elemental Composition in Female Dry Femora Using Portable X-Ray Fluorescence (pXRF): Association with Age and Osteoporosis. Calcif Tissue Int 109, 231–240 (2021). https://doi.org/10.1007/s00223-021-00840-5
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DOI: https://doi.org/10.1007/s00223-021-00840-5