Correlation between number of placental detachments and amount of postpartum uterine involution in mice

Both the uterine weight and total hydroxyproline content augumented in parallel with the number of placental scars on the day of parturition. In the uterus having any number of placental scars, the time of half loss of the organ weight and the total hydroxyproline content, respectively, was the same. These results suggested the amount of postpartum involution increases as the number of placental detachment becomes high.