Cited by 265Bone health and osteoporosis researchBone and Dental Protein StudiesCalcium Carbonate Crystallization and Inhibition

Dilatational band formation in bone

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Poundarik, Atharva A., Diab, Tamim, Sroga, Grazyna E., Ural, Ani, Boskey, Adele L., Gundberg, Caren M., Vashishth, Deepak·2012·Proceedings of the National Academy of Sciences

Abstract

Toughening in hierarchically structured materials like bone arises from the arrangement of constituent material elements and their interactions. Unlike microcracking, which entails micrometer-level separation, there is no known evidence of fracture at the level of bone’s nanostructure. Here, we show that the initiation of fracture occurs in bone at the nanometer scale by dilatational bands. Through fatigue and indentation tests and laser confocal, scanning electron, and atomic force microscopies on human and bovine bone specimens, we established that dilatational bands of the order of 100 nm form as ellipsoidal voids in between fused mineral aggregates and two adjacent proteins, osteocalcin (OC) and osteopontin (OPN). Laser microdissection and ELISA of bone microdamage support our claim that OC and OPN colocalize with dilatational bands. Fracture tests on bones from OC and/or OPN knockout mice (OC −/− , OPN −/− , OC-OPN −/−;−/− ) confirm that these two proteins regulate dilatational band formation and bone matrix toughness. On the basis of these observations, we propose molecular deformation and fracture mechanics models, illustrating the role of OC and OPN in dilatational band formation, and predict that the nanometer scale of tissue organization, associated with dilatational bands, affects fracture at higher scales and determines fracture toughness of bone.

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  • Microdamage may appear as debonding of the proteinaceous-hydroxyapatite composite or as slippage of the lamellae along one another or along cement lines.

    “Microdamage may appear as debonding of the proteinaceous–hydroxyapatite composite (such as debonding of hydroxyapatite aggregates and noncollagenous proteins) or as slippage of the lamellae along one another or along cement lines (6–8).”

    From Bone Mechanical Properties in Healthy and Diseased States (2018) · cites this paper as [7]

    The Results and Discussion (pages unavailable) describe damage involving deformation of protein complexes that link mineral aggregates, with rupture of mineralized collagen fibrils under further loading. This supports the mineral–protein damage aspect, but the passages do not describe lamellae slipping past one another or along cement lines. (LLM, conf=0.84)

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Authors
Poundarik, A. A., Diab, T., Sroga, G. E., Ural, A., Boskey, A. L., Gundberg, C. M., & Vashishth, D.
Affiliations
  • Rensselaer Polytechnic Institute (US)
  • Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;
  • Department of Mechanical Engineering, Villanova University, Villanova, PA 19085;
  • Hospital for Special Surgery (US)
  • Yale University (US)
Venue
Proceedings of the National Academy of Sciences
Published
2012-11-05
Volume
109
Issue
47
Pages
19178-19183
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2001957914
Cited by
265
References
49
Citations by year
2026: 5 · 2025: 12 · 2024: 11 · 2023: 18 · 2022: 18 · 2021: 20 · 2020: 43 · 2019: 23 · 2018: 27 · 2017: 13 · 2016: 18 · 2015: 30 · 2014: 17 · 2013: 10
FWCI
19.48
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR49635, R01AR038460, AR38460, R01AR041325, R01AR049635)
  • National Institute of Dental and Craniofacial Research (R37DE004141, DE04141, R01DE004141)
Topics
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
Keywords
osteocalcin, osteopontin, bone matrix, mineral aggregates, protein colocalization, bone microdamage, knockout mice, hierarchy, fatigue (material), indentation, fracture mechanics modeling
MeSH terms
Animals, Bone and Bones, Bone Matrix, Cattle, Enzyme-Linked Immunosorbent Assay, Hardness, Humans, Immunohistochemistry, Osteocalcin, Mice, Knockout, Microscopy, Confocal, Microscopy, Atomic Force, Fractures, Bone, Mice, Osteopontin

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