Related Experiment Video
Updated: Mar 29, 2026
08:36
Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
Published on: November 30, 2017
10.1K
Examining the Relationships Between Bone Tissue Composition, Compositional Heterogeneity, and Fragility Fracture: A
Adele L Boskey1, Eve Donnelly1,2, Elizabeth Boskey3
1Musculoskeletal Integrity Program, Hospital for Special Surgery, New York, NY, USA.
Summary
Fourier transform infrared imaging (FTIRI) reveals that a decreased carbonate-to-phosphate ratio and increased collagen maturity heterogeneity in bone are linked to fragility fractures. Age-related collagen changes may significantly contribute to fracture risk.
Area of Science:
- Biomaterials Science
- Orthopedics
- Medical Imaging
Background:
- Fourier transform infrared imaging (FTIRI) offers high-resolution chemical composition analysis of bone tissue.
- Previous studies suggested collagen maturity and mineral crystal size influence fracture risk, but associations with age and bone mineral density (BMD) required further investigation.
Purpose of the Study:
- To investigate the association of FTIRI-derived biochemical and structural variables with fragility fractures in iliac crest biopsies.
- To assess the impact of collagen maturity, acid phosphate substitution, carbonate-to-phosphate ratio, and heterogeneity on fracture risk, controlling for age and BMD.
Main Methods:
- A matched case-control study involving 120 women (60 with fragility fractures, 60 controls) matched for age and BMD.
- FTIRI was used to analyze iliac crest biopsies, measuring variables like carbonate-to-phosphate ratio and collagen maturity.
- Conditional logistic regression analyses were performed to identify significant explanatory variables for fracture.
Main Results:
- A decreased carbonate-to-phosphate ratio in cancellous and cortical bone was significantly associated with an increased risk of fragility fractures (ORs 0.580 and 0.519, respectively).
- Increased heterogeneity (pixel distribution) of collagen maturity in cancellous bone was also a significant predictor of fracture (OR 1.549).
- The association between collagen maturity and fracture risk observed in unmatched samples disappeared when age and BMD were controlled, suggesting age-related changes are key.
Conclusions:
- Reduced carbonate-to-phosphate ratio and altered collagen maturity heterogeneity are significant biochemical markers associated with fragility fractures.
- The findings highlight the critical role of age-dependent changes in collagen maturity in the pathogenesis of fragility fractures, independent of BMD.
- FTIRI is a valuable tool for identifying bone biochemical signatures linked to fracture risk.
Related Concept Videos
01:25IR Spectrometers
3.4K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
3.4K
01:03IR Frequency Region: Fingerprint Region
2.3K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
2.3K
01:27Fractures: Bone Repair
6.6K
Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
6.6K
01:24IR Spectroscopy: Molecular Vibration Overview
6.2K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
6.2K
01:09Infrared (IR) Spectroscopy: Overview
7.2K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
7.2K
01:16IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
3.7K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
According to Hooke's law, the vibrational frequency is directly proportional to...
3.7K