The vagina isn?t positioned vertically within the pelvis - it is angled towards the lower back. In most women, the uterus is tipped forward so that it lies over the bladder, with the top (fundus) towards the abdominal wall. Another normal variation found in some women is the upright uterus, where the fundus is straight up.

About one quarter of women have a retroverted uterus. This means the uterus is tipped backwards so that its fundus is aimed toward the rectum. While a retroverted uterus doesn?t cause problems in most cases, some women experience symptoms including painful sex. Other names for retroverted uterus include tipped uterus, retroflexed uterus and uterine retrodisplacement.

Symptoms
Generally, a retroverted uterus does not cause any problems. If problems do occur, it will probably be because the woman has an associated disorder like endometriosis. A disorder like this could cause the following symptoms:

• Painful sexual intercourse
• The woman-on-top position during sex usually causes the most discomfort
• Period pain (particularly if the retroversion is associated with endometriosis)

A range of causes
Some of the causes of a retroverted uterus include:

• Natural variation - generally, the uterus moves into a forward tilt as the woman matures. Sometimes, this doesn?t happen and the uterus remains tipped backwards.
• Adhesions - an adhesion is a band of scar tissue that joins two (usually) separate anatomic surfaces together. Pelvic surgery can cause adhesions to form, which can then pull the uterus into a retroverted position.
• Endometriosis - the endometrium is the lining of the uterus. Endometriosis is the growth of endometrial cells outside the uterus. These cells can cause retroversion by ?gluing? the uterus to other pelvic structures.
• Fibroids - these small, non-cancerous lumps can make the uterus susceptible to tipping backwards.
• Pregnancy - the uterus is held in place by bands of connective tissue called ligaments. Pregnancy can overstretch these ligaments and allow the uterus to tip backwards. In most cases, the uterus returns to its normal forward position after childbirth - but sometimes it doesn?t.

Sexual problems
In most cases of retroverted uterus, the ovaries and fallopian tubes are tipped backwards too. This means that all of these structures can be ?butted? by the head of the penis during intercourse.

This is known as ?collision dyspareunia?. The woman-on-top position usually causes the most pain. It is possible for vigorous sex in this position to injure or tear the ligaments surrounding the uterus.

Fertility issues
It is thought that a retroverted uterus has no bearing on a woman?s fertility.

Retroverted uterus and pregnancy
In most cases, a retroverted uterus doesn?t interfere with pregnancy. After the first trimester, the expanding uterus lifts out of the pelvis and, for the remainder of the pregnancy, assumes the typical forward-tipped position. In a small percentage of cases, the growing uterus is ?snagged? on pelvic bone (usually the sacrum).

Article written by www.betterhealthchannel.vic.gov.au

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