Ilium and Health: Understanding Potential Issues and Conditions

The ilium is the large, fan-shaped upper bone of the pelvis (part of the hip bone). While not a primary site of intrinsic disease, it is involved in several clinical conditions:

Conditions Affecting the Ilium

• Fractures: High-energy trauma (motor vehicle crashes, falls). Can be isolated or part of pelvic ring injury. May involve sacroiliac joint.
• Sacroiliac (SI) Joint Dysfunction: The ilium articulates with the sacrum at the SI joint. Inflammation (sacroiliitis), arthritis, or mechanical strain cause low back/buttock pain.
• Apophysitis (Adolescents): Overuse inflammation at iliac crest growth plates (e.g., iliac crest apophysitis in runners).
• Bone Tumors: Primary (osteosarcoma, chondrosarcoma) or metastatic lesions can arise in the ilium.
• Infection: Osteomyelitis (hematogenous or contiguous spread).
• Biopsy Site: Iliac crest is a common site for bone marrow biopsy.

Clinical Significance

Iliac pain or tenderness warrants evaluation for trauma, inflammatory arthritis (ankylosing spondylitis, psoriatic arthritis), infection, or neoplasm. Imaging (X-ray, MRI, CT) and labs guide diagnosis.