What causes iliac crest pain

Overview

The iliac crest is the prominent, curved upper border of the ilium, the largest of the three bones forming each side of the pelvis. It serves as a crucial attachment point for numerous muscles, including the abdominal obliques, quadratus lumborum, and the iliacus muscle, as well as the latissimus dorsi. Due to its exposed location and the significant muscular forces it endures, the iliac crest is susceptible to a variety of conditions that can result in pain. Understanding the potential causes is essential for accurate diagnosis and effective treatment.

Common Causes of Iliac Crest Pain

Overuse Injuries

One of the most frequent culprits behind iliac crest pain is overuse, particularly in individuals engaged in high-impact or repetitive activities. This category encompasses several specific conditions:

• Stress Fractures: These are tiny cracks in the bone that develop over time due to repetitive force, often seen in runners, dancers, and military recruits. The constant stress can exceed the bone's ability to repair itself, leading to pain that worsens with activity and may improve with rest. The iliac crest, being a weight-bearing structure and an attachment site for powerful muscles, is vulnerable.
• Muscle Strains: The muscles that attach to the iliac crest, such as the external and internal obliques, the transversus abdominis, and the iliopsoas group (hip flexors), can become strained or torn. This often occurs during sudden movements, forceful contractions, or prolonged exertion without adequate conditioning. Pain from a muscle strain is typically localized to the area of the injured muscle and may be accompanied by tenderness and stiffness.
• Tendinopathy: Inflammation or degeneration of the tendons that attach muscles to the iliac crest can also cause pain. This is often a chronic condition resulting from repetitive friction or overuse.

Direct Trauma

A direct blow to the hip or a fall onto the iliac crest can cause significant pain and injury. Depending on the force of impact, this can result in:

• Contusions (Bruises): A direct impact can damage the soft tissues and blood vessels beneath the skin, leading to bruising, swelling, and localized pain.
• Fractures: While less common than stress fractures, a severe direct trauma can cause a complete fracture of the iliac crest. This typically results in intense pain, swelling, bruising, and difficulty bearing weight.

Inflammatory Conditions

Several inflammatory conditions can affect the hip region and present with pain that is perceived around the iliac crest:

• Osteoarthritis: Degenerative changes in the hip joint can sometimes refer pain to the iliac crest, although it is more commonly felt in the groin or thigh.
• Bursitis: Inflammation of the bursae, small fluid-filled sacs that cushion joints, can occur near the iliac crest. Trochanteric bursitis, located over the greater trochanter (a bony prominence on the upper femur), is common and can sometimes radiate pain superiorly.
• Seronegative Spondyloarthropathies: Conditions like ankylosing spondylitis or psoriatic arthritis can cause enthesitis, which is inflammation where tendons or ligaments attach to bone. The iliac crest is a common site for this, leading to chronic pain and stiffness.

Referred Pain

Pain originating from other areas can sometimes be felt at the iliac crest. This is known as referred pain.

• Lower Back Issues: Conditions affecting the lumbar spine, such as herniated discs, spinal stenosis, or sacroiliac joint dysfunction, can irritate nerves that supply sensation to the hip region. Sciatica, a common form of referred pain, involves irritation of the sciatic nerve and can manifest as pain radiating down the leg, sometimes originating or being perceived around the hip.

Other Less Common Causes

While less frequent, other conditions can also cause iliac crest pain:

• Infection (Osteomyelitis): Infection of the bone can occur, though it is rare. It typically presents with severe pain, fever, and swelling.
• Tumors: Benign or malignant tumors affecting the pelvis or surrounding soft tissues can cause pain. This is a rare cause and usually associated with other symptoms like unexplained weight loss or a palpable mass.
• Hernias: Inguinal hernias or other abdominal wall hernias can sometimes cause pain that radiates to the hip area.

Diagnosis and When to Seek Medical Advice

Diagnosing the cause of iliac crest pain usually involves a thorough medical history, a physical examination, and potentially imaging studies such as X-rays, MRI, or CT scans. If you are experiencing persistent or severe iliac crest pain, especially if it is accompanied by fever, significant swelling, inability to bear weight, or numbness and tingling, it is crucial to consult a healthcare professional for an accurate diagnosis and appropriate treatment plan.