Kristi, Nina was posterior during labour and I too had to be strapped to a CTG as I was induced with the drip. The best way for me was to stand over the bed (that way they could still strap the CTG to me) and with each contraction I would bend my legs up and down. (if that makes sense?) The back pain was awful, nothing like I'd ever imagined!!! I did end up with an epidural, however that was 7 hours of no pain relief and I just gave in too easy. In the end, during delivery, she turned.
I tried for weeks to move her, but she just wouldn't budge ... too stubborn!
Good luck with it all