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The hip is one of your body's larges weight bearing joints. Is consists of two main parts: a ball, or head of the femur at the top of your femur (thighbone) that fits into the acetabulum, a rounded socket in your pelvis. Bands of ligaments connect the ball to the socket and provide stability to the joint. The bone surface of your ball and socket has a smooth durable cover of articular cartilage that cushions the ends of the bones and enables them to move easily. A thin, smooth tissue called synovial membrane covers all remaining surfaces of the hip joint. In a healthy hip, this membrane makes a small amount of fluid that lubricates and almost eliminates friction in you hip joint. Normally, all of these parts of you hip work in harmony, allowing you to move easily without pain.
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