[Post-pregnancy osteoporosis].

The onset of idiopathic osteoporosis after delivery is called "Post-Pregnancy Osteoporosis", which was suggested for the syndrome by Nordin in 1955. Back pain and vertebral collapse are the most frequent feature. This disease usually occurs in the first pregnancy and dose not recur, but the mechanisms remains to be elucidated. It is suggested that in patients with post-pregnancy osteoporosis there may have been a transient failure of the usual changes in calciotropic hormones such as 1,25-(OH)2D, calcitonin and parathyroid hormone (PTH) to prepare the maternal skeleton due to the stress of childbirth. The clinical course of these patients accords well with previous reports.