![]() The posterior column is composed of the greater and lesser sciatic notches, posterior wall and dome of the acetabulum, and ischial tuberosity. The ilium, ischium, and pubis fuse together within the acetabulum and form a deep-seated depression in the lateral pelvis, which allows for the proximal transmission of weight from the axial skeleton to the lower extremity. It is usually divided into two separate anatomic regions: the pelvic girdle and pelvic spine. The anterior column is composed of the anterior ilium, anterior wall and dome of the acetabulum, and superior pubic ramus. Iliopectineal eminence: anterior pelvic rim prominence at the union of the ilium and pubis. Bony pelvis (Pelvis ossea) The bony pelvis is a complex basin-shaped structure that comprises the skeletal framework of the pelvic region and houses the pelvic organs. The column principle divides the acetabulum into the anterior and posterior columns and becomes important when considering acetabular fractures and their management. The lip-shaped acetabular labrum is a fibrocartilaginous structure attached to the margin of the acetabulum, increasing the acetabular articular area. As a result, more than half of the femoral head fits within the acetabulum. The radiological roof is simply a radiological line. The outline of the roof represents only a small 2-3 mm region of the acetabulum region. ![]() The normal movement of the hip depends upon the two surfaces fitting together. The radiological roof, or sourcil, is a line produced by the X-ray beam tangential to the most cranial portion of the acetabulum. Fractures of the pelvic ring and the Acetabulum continue to represent a challenge in both patients with acute severe trauma and increasingly in the elderly. The bone on the inner surface of the pelvis deep to the acetabular fossa is termed the quadrilateral plate and has clinical importance in classifying acetabular fractures. The ball is called the femoral head, the socket is called the acetabulum. The acetabular fossa extends superiorly from the acetabular notch. This depression is bridged with the transverse ligament of the hip, completing the circle and creating the acetabular foramen. The acetabular floor has a rough depression called the acetabular fossa that hosts the ligamentum teres. The acetabular margin forms three quarters of a circle with a deficiency located anteroinferiorly called the acetabular notch. The fusion is complete between 20 and 25 years of age 1. The three bones are initially separated by a Y-shaped triradiate cartilage that begins to fuse after puberty. Gross anatomyĪll three bones of the pelvis (the ilium, ischium, and pubis) together form the acetabulum. The acetabulum (plural: acetabula) is the large cup-shaped cavity on the anterolateral aspect of the pelvis that articulates with the femoral head to form the hip joint.
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