Obstetrics and Gynecology - A. M. Gromova 2000

Changes in the female body during pregnancy
Changes in the musculoskeletal system of a woman during pregnancy

Due to the increase in the volume and mass of the Uterus, the center of gravity of a pregnant woman's body shifts. As a result, the spine straightens, lumbar lordosis deepens, and a characteristic "proud posture" appears. The rib cage broadens, and the Ribs assume a more horizontal position.

Certain changes also occur within the Bone tissue itself, driven by shifts in the phosphorus-calcium balance and increased Blood supply to the bones. The Connective Tissue of articular ligaments and Cartilage becomes looser. These changes are induced by relaxin produced in the Placenta. Mobility in the sacroiliac joints and the symphysis increases. The pubic bones diverge slightly (by 0.5–0.9 cm). These alterations result in a slight enlargement of the anteroposterior diameter of the pelvic inlet, facilitating the passage of the fetal HEAD through this plane during childbirth.



Last update: 08/08/2026

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