2D size of trabecular bone structure units (BSU) correlate more strongly with 3D architectural parameters than age in human vertebrae

Britney Alexi Lamarche, Jesper Skovhus Thomsen, Christina Møller Andreasen, W. Brent Lievers, Thomas Levin Andersen*

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

Bone tissue is continuously remodeled. In trabecular bone, each remodeling transaction forms a microscopic bone structural unit (BSU), also known as a hemiosteon or a trabecular packet, which is bonded to existing tissue by osteopontin-rich cement lines. The size and shape of the BSUs are determined by the size and shape of the resorption cavity, and whether the cavity is potentially over- or under-filled by the subsequent bone formation. The present study focuses on the recently formed trabecular BSUs, and how their 2D size and shape changes with age and trabecular microstructure. The study was performed using osteopontin-immunostained frontal sections of L2 vertebrae from 8 young (aged 18.5–37.6 years) and 8 old (aged 69.1–96.4 years) control females, which underwent microcomputed tomography (μCT) imaging prior to sectioning. The contour of 4230 BSU profiles (181–385 per vertebra) within 1024 trabecular profiles were outlined, and their 2D width, length, area, and shape were assessed. Of these BSUs, 22 (0.5%) were generated by modeling-based bone formation (i.e. without prior resorption), while 99.5% were generated by remodeling-based bone formation (i.e. with prior resorption). The distributions of BSU profile width, length, and area were significantly smaller in the old versus young females (p < 0.005), and the median profile width, length, and area were negative correlated with age (p < 0.018). Importantly, these BSU profile size parameters were more strongly correlated with trabecular bone volume (BV/TV, p < 0.002) and structure model index (SMI, p < 0.008) assessed by μCT, than age. Moreover, the 2D BSU size parameters were positively correlated to the area of the individual trabecular profiles (p < 0.0001), which were significantly smaller in the old versus young females (p < 0.024). The BSU shape parameters (aspect ratio, circularity, and solidity) were not correlated with age, BV/TV, or SMI. Collectively, the study supports the notion that not only the BSU profile width, but also its length and area, are more influenced by the age-related bone loss and shift from plates to rods (SMI), than age itself. This implies that BSU profile size is mainly driven by changes in the trabecular microstructure, which affect the size of the resorption cavity that the BSU refills.

OriginalsprogEngelsk
Artikelnummer116399
TidsskriftBone
Vol/bind160
ISSN8756-3282
DOI
StatusUdgivet - jul. 2022

Bibliografisk note

Funding Information:
This study is supported by NSERC grant RGPIN-2015-05019 , Mitacs grant IT13951 , and a VELUX Foundation grant 25723 . The μCT scanner was donated by the VELUX Foundation. The authors gratefully acknowledge the help of Dr. Bruce Oddson with the statistical analysis, and the excellent technical assistance by Kaja S. Laursen, Birgit MacDonald, and Malene H. Nielsen.

Funding Information:
TLA has collaborated on investigator studies with Amgen, UCB, and 10? genomics. TLA has obtained a research grant from UCB and free reagents from 10? genomics for these investigator-initiated studies.This study is supported by NSERC grant RGPIN-2015-05019, Mitacs grant IT13951, and a VELUX Foundation grant 25723. The ?CT scanner was donated by the VELUX Foundation. The authors gratefully acknowledge the help of Dr. Bruce Oddson with the statistical analysis, and the excellent technical assistance by Kaja S. Laursen, Birgit MacDonald, and Malene H. Nielsen.

Publisher Copyright:
© 2022

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