The prevalence of and factors related to calcium pyrophosphate dihydrate crystal deposition in the knee joint K. Ryu, T. Iriuchishima, M. Oshida, Y.

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The prevalence of and factors related to calcium pyrophosphate dihydrate crystal deposition in the knee joint K. Ryu, T. Iriuchishima, M. Oshida, Y. Kato, A. Saito, M. Imada, S. Aizawa, Y. Tokuhashi, J. Ryu Osteoarthritis and Cartilage Volume 22, Issue 7, Pages 975-979 (July 2014) DOI: 10.1016/j.joca.2014.04.022 Copyright © 2014 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 CPPD deposition in the knee joint. Deposition of CPPD crystals was observed in either the articular surface (hyaline cartilage: A) or meniscus (fibrous cartilages: B). Osteoarthritis and Cartilage 2014 22, 975-979DOI: (10.1016/j.joca.2014.04.022) Copyright © 2014 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Compensated polarizing light microscopic findings of CPPD crystal. CPPD crystal appears rhomboid-shaped with triclinic structures and positive birefringent. When the long axis of the crystal was parallel to the Z′ axis (parallel to the axis of the compensator), the color of the crystal was blue (A). When the long axis of the crystal was parallel to the X′ axis (perpendicular to the axis of the compensator), the color of the crystal was yellow. Osteoarthritis and Cartilage 2014 22, 975-979DOI: (10.1016/j.joca.2014.04.022) Copyright © 2014 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Characteristic infrared absorption spectra of CPPD crystals. All crystals obtained from the specimens exhibited characteristic infrared absorption spectra under FTIR analysis and were confirmed as CPPD crystals. Osteoarthritis and Cartilage 2014 22, 975-979DOI: (10.1016/j.joca.2014.04.022) Copyright © 2014 Osteoarthritis Research Society International Terms and Conditions