Abstract
There are significant clinical reasons motivating scientists to better understand how loading conditions, diseases, synthetic implants, and drug treatments affect bone formation and resorption. Changes in bone turnover have enormous impact on the quality and mechanical competence of the skeleton. Until recently, bone formation and resorption were primarily measured using biochemical markers of bone turnover or histomorphometry. However, recent advances in computed tomography allow one to follow structural changes in the cortical and trabecular bone of living animals and human patients. The aim of this chapter is to describe recently developed methods that allow the monitoring of bone modeling and remodeling processes in vivo by using registered longitudinal micro-computed tomography data, which serves as an imaging biomarker of bone formation and resorption. The chapter provides an overview of bone modeling and remodeling processes and the standard methods that have been used in the past and present to assess bone formation and resorption. Micro-computed tomography-based imaging of the bone is then discussed. A detailed description is then given of recently developed computation methods that allow monitoring of bone modeling and remodeling using registered longitudinal micro-computed tomography data as an imaging biomarker of bone formation and resorption. The chapter ends with a discussion of how these imaging-based biomarkers of formation and resorption can be used to complement and in some cases replace conventional experimental and clinical methods of monitoring bone turnover.
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Abbreviations
- AFR:
-
Activation, formation, and resorption
- BALP:
-
Bone-specific alkaline phosphatase
- BFR:
-
Bone formation rate
- BMU:
-
Basic multicellular unit
- BRR:
-
Bone resorption rate
- BS:
-
Bone surface
- BSP:
-
Bone sialoprotein
- BV:
-
Bone volume
- CTX:
-
Carboxy-terminal cross-linked telopeptide of type I collagen
- DPD:
-
Deoxypyridinoline
- ES:
-
Eroded surface
- EV:
-
Eroded volume
- HR-pQCT:
-
High-resolution peripheral quantitative computed tomography
- LRP5/6:
-
Lipoprotein receptor-related protein 5 and 6
- MAR:
-
Mineral apposition rate
- microCT:
-
Micro-computed tomography
- MRR:
-
Mineral resorption rate
- MS:
-
Mineralizing surface
- MV:
-
Mineralized volume
- NTX:
-
Amino-terminal cross-linked telopeptide of type I collagen
- OC:
-
Osteocalcin
- PICP:
-
Procollagen type I C-terminal propeptide
- PINP:
-
Procollagen type I N-terminal propeptide
- PYD:
-
Pyridinoline
- TRACP5b:
-
5b isoenzyme of tartrate-resistant acid phosphatase
- TRAP:
-
Tartrate-resistant acid phosphatase
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Birkhold, A.I., Willie, B.M. (2017). Registered Micro-Computed Tomography Data as a Four-Dimensional Imaging Biomarker of Bone Formation and Resorption. In: Patel, V., Preedy, V. (eds) Biomarkers in Bone Disease. Biomarkers in Disease: Methods, Discoveries and Applications. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7693-7_7
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