Answer
Fig. 9:1
The acetabulum of the hip bone articulates with the head of the femur to form the coxal or hip joint.
Fig. 9:2
The medial edge of the ilium of each hip bone articulates with the sacrum to form a sacroiliac (SI) joint.
Work Step by Step
The acetabulum of the hip bone is comprises of parts of ilium, ischium and pubis. The head of the femur fits into the acetabulum to form the hip joint (coxal joint). This is a ball and socket joint like the glenohumeral joint of the shoulder. The SI joint permits a wide range of motions, but less than does the shoulder joint.
