Dealing with Pressure Sores

Hi, I’m new to the forum and hoping for some advice or tips. I have Limb Girdle MD and suffering greatly from pressure sores on my back and side, especially at night as I can’t move myself in bed. My husband and I have tried various mattress toppers and recently bought a static mattress from a supplier that was marketed as helping with pressure reduction / re-distribution. But none of this has helped. We are thinking we now need to try a different type of mattress eg dynamic or air. But don’t know where to start as seem to be many options. Looking for any suggestions or recommendations on what option to try next, or any other ideas to relieve or prevent the sores.