Changes in Skeletal System during Pregnancy

Pain localized at the pelvic girdle during and after pregnancy has been keyed out and registered as an entity since the 4th century BC by Hippocrates. Contemporary medical research since the early 20th century has attempted to clarify the spectrum of the different pathologies that this clinical syndrome represents [1]. Up till now, the pregnancy causes changes in spinal curvature and posture remains open for further studies. One of the most frequent complications of pregnancy is low back pain, with 50±70% prevalence [2]. Its incidence is higher in the third trimester of pregnancy, when the most important biomechanical and morphological changes take place. From the second trimester, abdominal morphology is altered by the increased size of the uterus and the weightiness of the fetus, with a 30% gain in abdominal mass [3]. Despite the frequent occurrence of the problem, no explicit criteria for diagnosis and therapy guidelines are available in the literature. The increased size of the abdomen has been linked to a decreased static stability and adaptive changes in spinal curvatures, which would compensate the anterior displacement of the center of gravity, to ensure postural balance [4].