Microstructural characterization of CPPD and hydroxyapatite crystal depositions on human menisci

摘要

Meniscus is a fibrocartilaginous tissue composed mainly of water and a dense elaborate collagen network with a predominantly circumferential alignment. Crystal formation and accumulation on meniscal tissue is frequently observed especially in elderly. In this study, we used X-ray diffraction (XRD), FTIR and FT-Raman for the structural identification of the depositions and Optical microscopy, Scanning Electron microscopy (SEM/EDX) and Atomic Force microscopy (AFM), in order to investigate the structural relationship between the crystal deposits and the collagen fibers of human meniscal tissues. We are reporting on the formation of intercalary "colonies" of Calcium Pyrophosphate Dihydrate (CPPD) crystalswith two distinct morphologies corresponding to the monoclinic and the triclinic phase, as well as the formation of micro-aggregations composed of nanocrystalline HAP aggregations which are developed along the longitudinal axis of collagen fibers without extensively disturbing the collagens arrangement.