Compression fractures are commonly associated with underlying osteoporosis, particularly in the thoracic region.
Note the wedge shape appearances of T5 and T6 on the lateral view, and the loss of height of T6 on the AP view.
Click on the x-rays to enlarge.
Fig 1: T5 and 6 wedge, lateral view | Fig 2: T5 and 6 wedge, AP view |