title: Mixed crystal deposition in an osteoarthritic joint.
abstract: The case of a 72-yr-old woman with osteoarthritis of the shoulder, is described. A mixture of crystals of hydroxyapatite and calcium pyrophosphate dihydrate was identified in the joint tissues using analytical electron microscopy and infra-red spectroscopy.
mesh_terms: D000368:Aged; D002131:Calcium Pyrophosphate / Q000032:analysis; D003460:Crystallization; D005260:Female; D006801:Humans; D006882:Hydroxyapatites / Q000032:analysis; D008855:Microscopy, Electron, Scanning; D010003:Osteoarthritis / Q000473:pathology*; D012785:Shoulder Joint; D013583:Synovial Membrane / Q000648:ultrastructure
chemical_list: D006882:Hydroxyapatites; D002131:Calcium Pyrophosphate