New! Sign up for our free email newsletter.
Science News
from research organizations

Revealing the remarkable nanostructure of human bone

Date:
May 3, 2018
Source:
University of York
Summary:
Using advanced 3D nanoscale imaging of the mineral in human bone, research teams have shown that the mineral crystals of bone have a hierarchical structure integrated into the larger-scale make-up of the skeleton.
Share:
FULL STORY

Scientists have produced a 3D nanoscale reconstruction of the mineral structure of bone.

Bone performs equally well whether in an accelerating cheetah or in a heavy elephant, thanks to its toughness and strength.

The properties of bone can be attributed to its hierarchical organisation, where small elements form larger structures.

However, the nanoscale organisation and relationship between bone's principle components -- mineral and protein -- have not been fully understood.

Using advanced 3D nanoscale imaging of the mineral in human bone, research teams from the University of York and Imperial College London have shown that the mineral crystals of bone have a hierarchical structure integrated into the larger-scale make-up of the skeleton.

Researchers combined a number of advanced electron microscopy-based techniques, and found that the principal building blocks of mineral at the nanometre scale are curved needle-shaped nanocrystals that form larger twisted platelets that resemble propeller blades.

The blades continuously merge and split throughout the protein phase of bone. The interweaving mineral and protein form continuous networks to provide the strength essential for functional bones.

Lead author, Associate Professor Roland Kröger, from the University of York's Department of Physics, said: "Bone is an intriguing composite of essentially two materials, the flexible protein collagen and the hard mineral called apatite."

"There is a lot of discussion about the way these two stiff and flexible phases uniquely combine to provide toughness and strength to bone.

"The combination of the two materials in a hierarchical manner provides bone with mechanical properties that are superior to those of its individual components alone and we find that there are 12 levels of hierarchy in bone."

Dr Natalie Reznikov, formerly of Imperial College, London and an author on the paper, said: "If we compare this arrangement, for example, to an individual living in a room of a house, this extends to a house in a street, then the street in a neighbourhood, a neighbourhood in a city, a country and on it goes. If you continue to 12 levels you are reaching the size of a galaxy! "

Professor Molly Stevens, from Imperial College, London, added: "This work builds on the shoulders of many beautiful previous studies investigating the fundamental properties and structure of bone and helps to unlock an important missing piece of the puzzle."

Besides the large number of nested structures in bone, a common feature of all of them is a slight curvature, providing twisted geometry. To name a few, the mineral crystals are curved, the protein strands (collagen) are braided, the mineralized collagen fibrils twist, and the entire bones themselves have a twist, such as those seen in the curving shape of a rib for example.

Fractals are common in Nature: you can see self-similar patterns in lightning bolts, coast lines, tree branches, clouds and snowflakes. This means that the structure of bone follows a fundamental order principle in Nature.

The authors believe that the fractal-like structure of bone is one of the key reasons for its remarkable attributes.

The findings are published in the journal Science.


Story Source:

Materials provided by University of York. Note: Content may be edited for style and length.


Journal Reference:

  1. Natalie Reznikov, Matthew Bilton, Leonardo Lari, Molly M. Stevens, Roland Kröger. Fractal-like hierarchical organization of bone begins at the nanoscale. Science, 2018; 360 (6388): eaao2189 DOI: 10.1126/science.aao2189

Cite This Page:

University of York. "Revealing the remarkable nanostructure of human bone." ScienceDaily. ScienceDaily, 3 May 2018. <www.sciencedaily.com/releases/2018/05/180503142827.htm>.
University of York. (2018, May 3). Revealing the remarkable nanostructure of human bone. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2018/05/180503142827.htm
University of York. "Revealing the remarkable nanostructure of human bone." ScienceDaily. www.sciencedaily.com/releases/2018/05/180503142827.htm (accessed March 28, 2024).

Explore More

from ScienceDaily

RELATED STORIES