Randomized Study on the Evaluation of the Regular Practice of Standardized Postures Stretching Postural® in Secondary Prevention of Low Back Pains During Pregnancy.

Lower back pain (LBP) during pregnancy is a frequent syndrome: it concerns two thirds of pregnant women. This complaint isn't routinely searched for and therefore underdiagnosed. Furthermore, few solutions are given to these women in order to reduce their pain, and indirectly to improve everyday life. What's more, LBP is the cause of many work interruptions. Physical exercise during pregnancy is recommended by the National College of Gynaecologists and Obstetricians for low risk pregnancies. Several techniques have proven to be efficient. The main objective of our study is to assess the benefit of regular practice of standardised Stretching Postural® postures in patients presenting "de novo" lower back pain during pregnancy. The Stretching Postural® technique comprises of static postures involving muscular contractions and stretches. This allows the strengthening of the postural muscles, including the paravertebral muscles. After a short learning period, postures can be done autonomously by the patients. The postures are adaptable to each and everyone's morphology and physical limitations. Our study is an open, prospective, randomised monocentric superiority trial in parallel branches involving major patients during low risk pregnancies. These women suffer from "de novo" lower back pain during the second and third trimesters of their pregnancies. Each patient will be randomly assigned to one of the following 2 groups: * Stretching Postural® group (group A): usual prevention methods (ergonomic education) and Stretching Postural® postures. * "Control" group (group B): usual prevention methods only. Patients presenting "de novo" LBP are included in the study after a routine consult then randomly separated into two groups. During the initial consult, the physician assesses inclusion and judgement criteria, collects informed consent from the patients and teaches them the usual prevention methods as well as, concerning group A, Stretching Postural® postures. Computer