Dupuytrens disease. http://www.handctr.com/dupuytrens-disease-faq.html It is common in Northern European heritage but can be seen in any ethnicity or origin. Some say that Scandinavian countries have up to 30-40% of the population involved .http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1305903/ Treatments vary from observation, to Xiaflex (collagenase clostridium histolyticum) to aponeurotomy to surgery depending upon a variety of factors.
3-6% in USA. Incidence is 3-6% in USA. More common in men, but women catch up in their 70's. It is a hereditary disease.
Hereditary. Dupuytrens is an hereditary disorder found in northern europeans. It is fairly common in that ethnic group with varying degrees of penetration within the population.