Crest of ilium

Crest of ilium is a significant anatomical structure in the human skeletal system. It is the superior border of the ilium, one of the three fused bones that form the hip bone or os coxae. The crest of ilium plays a crucial role in the attachment of various muscles and ligaments, contributing to the stability and mobility of the pelvis and lower limbs.

Anatomy

The crest of ilium extends from the anterior superior iliac spine to the posterior superior iliac spine. It is convex in its general outline but is sinuously curved, being concave inward in front, concave outward behind. It is thinner at the center than at the extremities. The outer lip is the thickest part and is rounded off from before backward. The inner lip is thinner and more sharp and prominent.

Function

The crest of ilium serves as an attachment site for several muscles, including the tensor fasciae latae, gluteus maximus, gluteus medius, gluteus minimus, iliocostalis, quadratus lumborum, and latissimus dorsi. These muscles are involved in movements such as hip flexion, extension, abduction, and rotation. The crest also provides attachment for the fascia lata and the iliotibial tract, which are important for stabilizing the hip and knee during walking and running.

Clinical significance

Due to its superficial location, the crest of ilium is often used as a landmark in clinical examinations and surgical procedures. It is also a common site for bone graft harvesting in orthopedic surgery. Injuries to the crest of ilium, such as fractures or avulsions, can occur due to direct trauma or excessive muscular strain and can lead to pain, swelling, and impaired mobility.

See also

• Ilium (bone)
• Hip bone
• Pelvis
• Human skeleton