Pelvic bone

The pelvic bone (os coxae) up to 12-16 years of age consists of three separate bones connected by cartilage: the ilium, pubis and ischium, which at this age fuse with each other.

In the area of fusion of the bodies of these bones there is a deep acetabulum, which is the articular fossa for the head of the femur. The acetabulum is limited in circumference by a high edge, which on its medial side has an acetabular notch (incisura acetabuli). For articulation with the head of the femur in the acetabulum, along its periphery, there is a semilunar surface (facies lunata). In the center of the acetabulum is the acetabular fossa (fossa acetabuli).

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