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Apatites in heterotopic calcifications

G Faure, G Daculsi, P Netter

Scanning Electron Microscopy

|January 1, 1982

Summary

This study analyzed shoulder tendon sheath and subcutaneous calcinosis calcifications. The heterogeneous calcifications are composed of carbonate-apatite with distinct crystalline phases.

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Area of Science:

Biomineralization
Materials Science
Medical Research

Background:

Calcifications in shoulder tendon sheath and subcutaneous calcinosis are common conditions.
Understanding the composition and structure of these calcifications is crucial for diagnosis and treatment.

Purpose of the Study:

To characterize the material properties of calcifications from shoulder tendon sheath and subcutaneous calcinosis.
To investigate the heterogeneity and crystalline phases within these calcifications.

Main Methods:

Utilized a comprehensive suite of analytical techniques including scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectrometry (IR), wavelength dispersive X-ray spectrometry (WDS), high-resolution transmission electron microscopy (HRTEM), and electron microdiffraction (EMD).
Analyzed calcified material from three patients with shoulder tendon sheath calcifications and one patient with subcutaneous calcinosis.

Main Results:

The calcifications are primarily composed of carbonate-apatite.
Analysis revealed significant heterogeneity within the calcified material.
At least two distinct phases with differing crystallinity were identified within the samples.

Conclusions:

Shoulder tendon sheath and subcutaneous calcinosis calcifications exhibit complex, heterogeneous structures.
The presence of multiple crystalline phases suggests varied formation or transformation processes.
Further research into these distinct phases may offer insights into calcification mechanisms and therapeutic targets.

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