Three second-time moms have just contacted me with the same basic question. Two are 39 weeks pregnant and one was a little less. Each just discovered her baby is posterior. Each ask if something can be done to avoid another long labor with back ache, like their first posterior labors. One's physician offered her a cesarean just because of the posterior starting position so she switched physicians.
My web site had this information. Evidently, the information isn't accessible. I looked over my site and saw why. My titles are not discriptive enough. Sometimes I develop the subject beyond the scope of the title and so a viewer doesn't know where to look.
Improvements must be made. And will be. Meanwhile, try the search tool, reading The Three Principles and What to do when.