A retroverted uterus (tilted uterus, tipped uterus) is a uterus that is tilted backwards instead of forwards. This is in contrast to the slightly "anteverted" uterus that most women have, which is tipped forward toward the bladder, with the anterior end slightly concave.
One in three to five women (depending on the source) has a retroverted uterus, which is tipped backwards towards the spine.
Uterine position has no effect on fertility. A tipped uterus will usually right itself during the 10th to 12th week of pregnancy.
If a uterus does not right itself, it may be labeled persistent. "Persistent retroflexion of the pregnant uterus is incompatible with advanced pregnancy. If spontaneous or artificial reposistion does not occur, the patient either aborts or develops symptoms caused by incarceration of the uterus before the end of the fourth month. In exceptional instances, however, pregnancy may proceed, resulting in uterine sacculation. Spontaneous delivery is impossible, and rupture of the uterus may occur."
Treatment options are rarely needed, and include exercises, a pessary, manual repostioning, and surgery.
^ Gant NF. Cunningham FG. Basic Gynecology and Obstetrics, 1995, p 375 - chapter 48
Diseases of the pelvis, genitals and breasts (N40-N99, 600-629)