Crystals in joints.
D001168:Arthritis / Q000209:etiology; D011232:Chemical Precipitation; D003460:Crystallization; D003461:Crystallography / Q000379:methods; D006801:Humans; D007592:Joint Diseases / Q000378:metabolism*; D007596:Joints / Q000378:metabolism*; D008853:Microscopy / Q000379:methods; D012219:Rheumatology / Q000639:trends; D013582:Synovial Fluid / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure