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It is characterized by several typical abnormalities of the arms and legs as well as kidney disease and glaucoma. It has been recognized as a hereditary condition for over 100 years and is inherited in an autosomal dominant manner. That is, the risk of transmission is 50% per pregnancy, irrespective of gender (just like flipping a coin). Approximately 20% of cases are sporadic, being the result of a new mutation. The incidence is approximately 1 in 50,000 and occurs throughout the world in all ethnic groups. From www.nailpatella.org