Avascular Necrosis (AVN) of the Hip Joint: Symptoms, Causes, Stages & Best Treatment Options: Dr. Balaraju Naidu, Robotic Orthopedic Surgeon
Avascular Necrosis (AVN), also known as Osteonecrosis, is a condition where the blood supply to the head of the femur (hip bone) reduces or stops. Without proper blood flow, the bone becomes weak, gradually collapses, and leads to severe pain and hip disability.
AVN is commonly seen in young adults (20–50 years) and when diagnosed early, the natural hip joint can be preserved. If diagnosed late, hip replacement surgery may be required.
What is the Hip Joint and How AVN Affects It?
The hip is a ball-and-socket joint.
- The ball is called the femoral head.
- The socket is called the acetabulum.
For the femoral head to stay healthy, it needs a constant blood supply.
In AVN, this blood supply gets reduced or blocked, causing:
- Bone weakening
- Bone collapse
- Loss of joint shape
- Severe pain and stiffness
Common Causes of AVN
| Cause | Explanation |
| Steroid Medication | Long-term or high-dose steroids (often used in asthma, autoimmune disease, or COVID treatment). |
| Alcohol Intake | Excessive alcohol weakens blood vessels supplying the bone. |
| Trauma / Fracture | Injuries near the hip can damage blood flow. |
| Blood Disorders | Example: Sickle Cell Disease. |
| Unknown Causes | In many patients, the exact cause is not known. |
Symptoms of AVN
- Pain in the groin, hip, or thigh
- Pain increases while walking, climbing stairs, or sitting for long periods
- Stiffness and reduced hip movement
- Limp while walking (in late stage)
- Difficulty sitting cross-legged or squatting
Important: Early stages may only show mild pain — but that’s when treatment is most effective.
Stages of AVN (Progression of the Disease)
| Stage | Description | Treatment Approach |
| Stage 1 | Blood supply reduced; X-ray normal; MRI required | Medicines, Core Decompression, Stem Cell Therapy |
| Stage 2 | Bone weakening visible on X-ray | Biological Joint Preservation Procedures |
| Stage 3 | Bone starts collapsing; pain & limp increase | Hip Preservation Surgery / Osteotomy |
| Stage 4 | Complete joint collapse & arthritis | Total Hip Replacement |
Diagnosis of AVN
- Clinical Examination
- X-Ray Hip Joint
- MRI (Most sensitive; detects early stage changes)
- Blood Tests (if needed)
Treatment Options for AVN
1. Early Stage Treatment (Stage 1 & 2)
Goal: Save the natural hip joint
- Core Decompression Surgery
- Stem Cell / Bone Marrow Concentrate (BMAC) Therapy
- PRP Therapy
- Bisphosphonates, Calcium & Vitamin D support
- Lifestyle modifications (avoid alcohol and steroids)
2. Middle Stage Treatment (Stage 2–3)
- Bone Grafting Procedures
- Vascularized Fibular Graft
- Osteotomy (to realign load and delay collapse)
3. Late Stage Treatment (Stage 3–4)
If the bone collapses and pain is severe:
Robotic / Ceramic Total Hip Replacement (THR)
- Highly durable implants (25+ years)
- Precision placement with robotic assistance
- Walk next day
- Faster recovery & natural joint movement
Lifestyle & Prevention Tips
- Avoid excess alcohol
- Never use steroids without doctor’s supervision
- Maintain healthy weight
- Treat injuries early
- Do regular follow-up if diagnosed
Why Early Diagnosis is Important?
- Early stage AVN is reversible
- Late stage AVN is not
- Delay leads to bone collapse and disability
If detected early → Hip can be preserved
If detected late → Replacement becomes necessary
AVN is a serious but treatable condition.
If you experience hip or groin pain, especially after steroid use, alcohol intake, or injury, consult an orthopedic specialist immediately.
