Innominate bone

Innominate bone is a large, flat bone that forms one of the two hip bones in the human body. It is also known as the hip bone, pelvic bone, or coxal bone. The innominate bone is formed by the fusion of three bones: the ilium, the ischium, and the pubis. This fusion occurs during adolescence.

Structure

The innominate bone is a large, irregularly shaped bone that forms part of the pelvic girdle. It is located in the lower part of the trunk, between the spine and the femur.

Ilium

The ilium is the largest of the three bones that make up the innominate bone. It forms the upper part of the hip bone and contributes to the formation of the pelvic brim and the acetabulum.

Ischium

The ischium forms the lower and back part of the hip bone. It is characterized by a large bony prominence, the ischial tuberosity, which bears the weight of the body when sitting.

Pubis

The pubis forms the anterior part of the hip bone. It contributes to the formation of the acetabulum and the pubic symphysis, the joint between the two pubic bones.

Function

The innominate bone plays a crucial role in supporting the weight of the upper body when standing, walking, or running. It also provides attachment points for numerous muscles and ligaments involved in movement and stability of the hip joint and the lower limb.

Clinical significance

Injuries or diseases affecting the innominate bone can lead to pain, impaired mobility, and other complications. These include fractures, osteoarthritis, osteoporosis, and hip dysplasia.

See also

• Pelvis
• Hip joint
• Skeletal system
• Bone