Okay, this is going to be a little lengthy
I had horrible back labor with my first two (pain from the top of my shoulders down to the top of my knees---contractions were like massive charlie horses). First one was asynclictic and a vacuum extraction; second was a posterior induction that I delivered on hands and knees without extra intervention. I just delivered my third last week ---same size as the first two--with MUCH less pain (though still in the back, just legs, not up the back) and a MUCH shorter labor--he was born 15 min. after I got to the hospital!!
What made the difference? What I learned from my chiropractor/cranio-sacral therapist, Dr. Carol Phillips, about the bio-mechanics of labor (she's the one who trained the author of spinningbabies.com--I found her info there and found out she lives near me!!). I'm convinced the work she did on me made all the difference; even though I came to her at 38 weeks with a sometimes transverse, sometimes diagonal baby, two sessions did the trick giving me a perfectly positioned baby and a rapid labor
So what does she believe causes back labor?
1. Tension in the mother's muscles/ligaments and misalignment of bones, which often results in the uterus being torqued inside a misaligned pelvis, resulting in a
2. Malpositioned baby who can't get in the right position because of the uterus' constraints. Baby is generally born with tension/torque in its body resulting in all sorts of problems like torticollis, colic, tons of spitting up, reflux, etc.
SO, is it genetic? In her years of studying, teaching, and "doulaing" over 700 births, Dr. Phillips has concluded that it's not "genetic"--as in the genes--- but it IS passed on from mother to daughter, because all the females come out of the same tense uterus
. The baby girls are born with muscle tension from their bad positioning, causing them often to have repeat difficult labors like their mothers UNLESS.....
they get help and get the tension and malpositioned back/pelvis issues worked out.
What exactly helps? Just straight chiropractic work---"pop your back/neck" DOESN"T work if your muscles and ligaments are tense. Massage and cranio-sacral work is needed before readjusting bones, or else they won't hold.
Check out her website: http://dynamicbodybalancing.com/
Her book and 1st DVD are really helpful (I'm in no way trying to sell a product---I've just been immensely helped in the last few weeks!)