ch 8- hip joint

structure of hip joint

articular surfaces are deep and secure capsule is heavy and strongly reinforced by ligaments depth of the acetabulum is enhanced by a circular rim of fibrocartilage called the acetabular labrum the thick articular capsule extends from the rim of the acetabulum to the neck of the femur and completely encloses the joint

hip joint

ball and socket joint formed by the acetabulum of the hip bone and the femoral head highly adapted for weight bearing good range of motion (less than shoulder); limited by deep socket, acetabular labrum, and strong ligaments

stability

chiefly from deep socket that encloses femoral head and ligaments tendons contribute

injuries

hip joint dislocations are rare because the labrum and head of femur fit snugly together labrum's diameter is less than that of the head of the femur

ligaments

they "screw" the femur head into the acetabulum when standing iliofemoral ligament pubofemoral ligament ischiofemoral ligament

ligamentum teres

ligament of the head of the femur flat intracapsular band that runs from the femur head to the lower lip of the acetabulum