http://www.apma.org/s_apma/doc.asp?CID=394&DID=9385
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American Podiatric Medical Association
Arthritis is a frequent component of complex diseases that may involve more than 100 identifiable disorders. If the feet seem more susceptible to arthritis than other parts of the body, it is because each foot has 33 joints that can be afflicted, and there is no way to avoid the pain of the tremendous weight-bearing load on the feet.