Pregnancy Bony Imprint on Japanese Female Pelves and Its Relation to Pregnancy Experience

Pelvic bones from 20 modern-Japanese female cadavers were examined in order to ascertain the relationship between the bony scar in the pre-auricular area of the ilium and pregnancies and/or parturitions. The age of cadavers ranged from 49 to 99 years. Sixteen women were reported to have born some children, and four were reported to have never given birth. In several cases, additional information on the number and spacing of deliveries and miscarriages was obtained. The scars were classified into three categories: PP (marked), P (moderate) and N (absent). It can be hypothesized that the scars result from the experience of pregnancy rather than parturition, that their development is possibly related to the number of pregnancies, and that they do not disappear even 18-65 years after the last childbirth.