Pelvic alignment changes during the perinatal period

Autoři: Saori Morino aff001;  Mika Ishihara aff002;  Fumiko Umezaki aff003;  Hiroko Hatanaka aff003;  Mamoru Yamashita aff003;  Tomoki Aoyama aff004
Působiště autorů: Department of Physical Therapy, Faculty of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka, Japan aff001;  Pilates Studio Wohl, Aichi, Japan aff002;  Kishokai Medical Corporation, Aichi, Japan aff003;  Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan aff004
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article



The function of the pelvic bones is to transfer load generated by body weight. Proper function of the pelvic bones can be disturbed by alignment changes that occur during pregnancy. Further, misalignment of the pelvic bones can lead to pain, urinary incontinence, and other complications. An understanding of the timing and nature of pelvic alignment changes during pregnancy may aid in preventing and treating these complications.


To investigate the changes in pelvic alignment during pregnancy and one month after childbirth.


This is a prospective, longitudinal cohort study. Pelvic measurements were obtained for 201 women at 12, 24, 30, and 36 weeks of pregnancy, and 1 month after childbirth. The anterior and posterior width of the pelvis (the distance between the bilateral anterior superior iliac spines and the bilateral posterior superior iliac spines), the anterior pelvic tilt, and pelvic asymmetry (the mean left and right pelvic tilt degrees and the bilateral difference of the anterior pelvic tilt) were measured. For the change in pelvic alignment, a Friedman test was conducted to determine any significant difference in the measurements over time.


The anterior and posterior width of the pelvis became significantly wider with pregnancy progress and the anterior width of the pelvis at 1 month after childbirth remained wider than that at 12 weeks of pregnancy (p < 0.001). The anterior pelvic tilt increased during pregnancy and decreased after childbirth (p < 0.05).


Some changes in pelvic alignment occur continuously during the perinatal period. Changes in the anterior width of the pelvis are not recovered at one month post-childbirth. Understanding these perinatal changes may help clinicians avert complications due to pelvic misalignment.

Klíčová slova:

Body weight – Incontinence – Labor and delivery – Lower back pain – Pelvis – Pregnancy – Skeletal joints – Management of high-risk pregnancies


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