<unk>  is a class of joint disorder (called arthropathy) that is characterized by accumulation of tiny<unk> s in one or more joints. Polarizing microscopy and application of other<unk> lographic techniques have improved identification of different microcrystals including monosodium urate, calcium pyrophosphate dihydrate, calcium hydroxyapatite, and calcium oxalate. Types include: Name Substance Birefringence Gout accumulation of uric acid negative Chondrocalcinosis aka Pseudogout accumulation of calcium pyrophosphate positive
Crystal arthropathy
Jaccoud arthropathy
Facet joint arthrosis
Enthesitis
Glossitis
Neuropathic arthropathy
Compression arthralgia
Inflammatory arthritis