The healthy hip is a ball-and-socket joint. The ball is at the top of the thighbone (femur), and the socket (acetabulum) is in the hipbone (pelvis). The connection allows the leg to move in a variety of positions. The ball and socket are each covered with cartilage that lubricates and cushions the bones during movement.
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Arthritis is a term that is used to describe over 100 different kinds of conditions that can affect the human body. There are millions of Americans who are affected by arthritis each year. Arthritis can cause pain, stiffness, swelling, and loss of motion in affected joints.