Best Orthopedic Hospital in Nagpur

The hip—specifically the femoral head—is the most common site for Avascular Necrosis because of a few important anatomical and physiological reasons:

1. Limited Blood Supply

The femoral head gets its blood mainly from small vessels (retinacular arteries). These vessels are:

• Thin

• Easily compressed or damaged
  So even a minor disruption (trauma, steroids, alcohol, etc.) can cut off blood flow.

2. End-Artery System (Poor Collateral Circulation)

Unlike some other bones, the femoral head has very little backup blood supply.
If one vessel is blocked, there are not enough alternative routes → bone tissue starts dying.

3. High Weight-Bearing Stress

The hip joint carries most of the body’s weight:

• Standing

• Walking

• Running

This constant pressure increases the risk of:

• Blood vessel compression

• Microfractures
  which can worsen blood supply problems.

4. Anatomical Position Inside Joint Capsule

The blood vessels run along the neck of the femur and are:

• Vulnerable in fractures (especially neck of femur fractures)

• Compressed by increased joint pressure

5. Slow Repair Capacity

Once blood supply is reduced:

• Bone cells die (necrosis)

• Repair is slow due to poor circulation
  → leads to collapse of the femoral head over time.

Simple Summary:

The hip is most affected because it has:

• Fragile blood supply

• Poor backup circulation

• High mechanical stress