I had rtw recently causing spine fracture, doctor said it looks like an old fracture but i have not had any fractures before at all. how can thus be?

Certain deformities : and even degenerative changes can look like a fracture on an x-ray. Fractures can even occur without any pain or other symptoms as well if there is an underlying issue with the bone such as a benign bone tumor like a hemangioma or underlying disease process leading to bone density loss or osteoporosis. You could have thought a past back pain was muscular and it may have been a fracture .