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What Is It?
The hip is the joint between the upper end of the thighbone (femur) and its socket in the pelvis. When a hip fractures (breaks), the injury is always in the femur. The upper end of the femur can fracture in any one of three places:
- The head of the femur — The rounded surface at the very end of the bone that fits into a socket in the pelvis.
- The neck of the femur — A somewhat horizontal stretch of bone at the top of the femur that gives this bone the shape of an inverted "L."
- Between or below the greater and lesser trochanters — The femur naturally bends at the lower boundary of the hip, angling toward the knee. At this bend, two bony humps protrude along the outside edge of the femur. These ridges are the greater trochanter and lesser trochanter.
Falling is the most common cause of hip fractures. Usually, this occurs in people older than 50. Older people are at risk of hip fractures because of osteoporosis, a disease that weakens bones and may be age-related. A hip also may be fractured during trauma, such as an automobile accident.
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