How are orthopaedic mattresses better than tedious mattresses?

I have tried both orthopaedic and middle-of-the-road mattresses and I find the orthopaedic are harder whereas the normal ones are easier to sink into and discern more comfortable. Although I think both provide me the same element of sleep. How exactly do ortopaedic mattresses benefit me over normal mattresses and do they work better for adjectives people contained by general?
Hope someone can assist. i hold osteo-necrosis of both hips and i use a orthopaedic mattress! the ortho's somehow keep you from sinking contained by deeper , so your body is less discomfort free in the morning or whenever you sleep! it's not well brought-up for people who hold bone problems to sink deep down! the bones of citizens suffering from osteo problems, must have their bones be steady and not move too much if not alot of pain after they rest! It's, in recent times better too hardle move, at all! I hope i explained how the body must not move around smaller number, is better!! Hope this helps!
Before you buy anything, check out the memory foam mattresses. Some moral brands are more affordable than the temperpedic you read about adjectives the time. We have one made by the company call Cannon.