A couple alternative options that may provide more support are:
-Squatting With a Birthing Bar:
Birthing bars are attachments that can be added to beds to help support yourself while you are in a squatting position. Squatting helps expand the pelvis which allows gravity to help the baby move down.-Birthing Stool:
Birthing stools a made to help you sit like you would when you go to the bathroom. It is also low to the ground with allows you to flex your legs out, expanding your pelvis. It is also useful because of the upright position gravity works to move the baby down. Using a birthing stool usually allows your partner to sit behind you so you can rest between contractions.-Sitting Upright:
This variation is similar to sitting on a birthing stool. It also is helpful because gravity is used to move the baby down the birth canal. In this position you can lean back supported by the bed that can be adjusted into a more chair like position.-Kneeling:
Kneeling can be a very helpful birthing position if you have had back pain during labor. It allows you to encourage the movement of your baby by flexing your hops and lower buttocks during contractions. This position is also affective on your hands and knees but could cause your wrists to be tired.-Laying Curled on Your Side Position
This position, laying on your side, is especially good for helping you to relax in between contractions. Some research has also shows that this is the most effective birthing position for preventing tearing.