M11: Other crystal arthropathies
M11.8: Other specified crystal arthropathies
"Other specified crystal arthropathies" refers to a category of joint conditions characterized by the presence of microscopic crystals within the joint fluid. These diseases can result from crystals formed from substances like uric acid or calcium phosphate. Crystal arthropathies trigger inflammation in the affected joints, leading to redness, warmth, swelling, and intense pain. The condition may manifest suddenly or gradually over time, depending on the type of crystal involved and individual patient factors. The presentations of these conditions can range from acute, severe attacks of joint pain to more chronic, less severe joint discomfort. Various joints can be affected including the knee, wrist, elbow, or ankle, but often the big toe joint is notably impacted. Disease progression can lead to continual joint damage, loss of mobility, or development of deformities if left untreated. It's important to note that this category excludes gout, a well-known crystal arthropathy.
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