14.2.1 Background properties: 'background-color', 'background-image', 'background-repeat', 'background-attachment', 'background-position', and 'background'. This property sets the background color of an element, either a <color> value or the keyword 'transparent', to make the underlying colors shine through.
1 A spiral fracture happens when the break spirals around the bone, which can happen if the bone is twisted. 2  A compression fracture happens when vertebrae in the spinal column are pushed together in an accident or because of osteoporosis.
Causes and Risk Factors. Acetabular fractures are usually caused by either high-energy trauma, most commonly from an automobile accident, or from what is called an insufficiency fracture. An insufficiency fracture is most common in older patients and is caused by the bone being weakened by osteoporosis.