[Osteoporosis - epidemiology and pathogenesis].

Osteoporosis is considered as a lifestyle disease with high prevalence in the developed countries. Its appearance with number of related fractures has increasing tendency. In the Czech Republic approximately 7 % of the population is affected, which is 700,000 people, 50,000 osteoporosis fractures a year are documented. Most frequent type of osteoporosis is postmenopausal osteoporosis which is classified in the group of primary osteoporosis similarly as a senile osteoporosis (involutive). Secondary osteoporosis is a line of causal risk factors. Osteoporosis at men is usually part of primary or secondary hypogonadism. Idiopathic juvenile osteoporosis is a rare type of the disease, appearing before the puberty and disappearing in the adulthood. Generally exists a list of osteoporosis risk factors analyzed in this article.Key words: epidemiology - idiopathic osteoporosis - primary osteoporosis - secondary osteoporosis - risk factors.