Compression fractures change the structure of the spine, so that vertebrae that had a parallel symmetric structure become wedge-shaped, and that doesn't improve or go back to what it was. So they are "chronic." The spinal vertebrae stabilize but don't "heal" the way, say, a broken arm might. Unfortunately!

@tilou do you have osteopenia or osteoporosis?

Most of us seem to have some degenerative changes on imaging- comes with age!