Porous bones, osteoporosis, are systemic which would leave you vulnerable to other skeletal fractures. Have you had a dxa bone scan. Someone is thinking osteoporosis or you wouldn't have been offered Prolia.
With osteoporosis in the spine a person usually has small breakages that the don't feel.
There is a network of tiny spaghettini-like bones that support the structure of each vertebra. A person can fracture myriad individual spicula (as those bones are called) without the painful collapse of the vertebral body. It's called a silent disease, until it announces itself with great pain. https://www.gettyimages.com/detail/photo/spongy-bone-site-of-red-marrow-3x-at-35mm-the-bony-royalty-free-image/139820247?adppopup=true