Question
Our rose buds are developed, but will not open.  They remain knotted in a tight bud.  We can force a bud to open by pulling outer petals and loosening them a number of times, they will eventually open, otherwise they just dry up.  

Answer
The reason that the buds are doing this is because they were damaged in the early spring. If rose buds start to form in normal weather and then there is a cold night, the buds can be damaged and what you describe is how they behave because the buds are partially frozen.