Hydroxyapatite pseudopodagra
Hydroxyapatite
pseudopodagra is acute calcific periarthritis occurring near the first
metatarsophalangeal (MTP) joint, causing podagra identical to that seen in
gout. This presentation is more common in young women who excessively pronate
their feet; walking or running causes repetitive trauma to this area. The
condition may be distinguished from gout according to the premenopausal status
of the patient, the absence of monosodium urate crystals in synovial fluid, and
characteristic calcifications around the joint on roentgenography. Symptoms
subside over several weeks, either spontaneously or with treatment.
Interestingly, the calcific deposit may dissolve during the acute inflammatory
episode, leading to disappearance of the calcification on follow-up
roentgenograms. This can also occur in other joint areas as the finger: Philadelphia-Finger.
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