Is LBP in pregnancy due to loss in stability?
Postpartum, Rectus abdominus takes about 4 weeks to re-shorten, and 8 weeks for pelvic stability to normalize (Gilleard & Brown, 1996)
Out of 869 pregnant women who were recruited for the study, 635 were excluded because of their spontaneous unaided recovery within a week of delivery (Bastiaenen et al., 2006)
Whereas all non-pregnant women could perform a sit-up, 16.6% of pregnant women could not perform a single sit-up. There was no correlation between the sit-up performance and backache. (Fast et al., 1990)
There are no known biomechanical predisposing factors for developing back pain during pregnancy!
Not even trunk muscle control or stability!