Fractures are the most frequent and serious complication of osteoporosis. They often occur in your spine or hips — bones that directly support your weight. Hip fractures usually result from a fall. Although most people do relatively well with modern surgical treatment, hip fractures can result in disability and even death from postoperative complications, especially in older adults. Wrist fractures from falls also are common.
In some cases, spinal fractures can occur without any fall or injury simply because the bones in your back (vertebrae) become so weakened that they begin to compress. Compression fractures can cause severe pain and require a long recovery. If you have many such fractures, you can lose several inches of height as your posture becomes stooped.
Sources mayoclinic.com