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Updated: Aug 10, 2026

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
Published on: February 9, 2021
Triple crystal disease: monosodium urate monohydrate, calcium pyrophosphate dihydrate, and basic calcium phosphate in
1Division of Rheumatology, Medical College of Wisconsin, Milwaukee 53226.
Abstract:
A 49 year old man is described with a polyarticular arthritis. Synovial fluid aspirated from the knee joint showed monosodium urate monohydrate and calcium pyrophosphate dihydrate by polarised light microscopy. Additionally, diphosphonate binding and scanning electron microscopy with energy dispersive analysis showed that basic calcium phosphate crystals were also present. This appears to be the first report of three crystals occurring simultaneously in a single joint.
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