Surgery for bi lateral AVN
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Here is a comprehensive overview of surgical management for bilateral avascular necrosis (AVN) of the femoral head, synthesized from orthopedic textbooks:
Surgical Management of Bilateral AVN (Femoral Head)
Staging — Key to Surgical Decision-Making
Treatment is guided by staging. The Ficat Classification (and Modified Foat System) are most widely used:
| Stage | Radiograph | MRI | Key Feature |
|---|---|---|---|
| 0 | Normal | Positive | Asymptomatic |
| 1 | Normal | Positive (edema) | Symptomatic |
| 2 | Cystic/sclerotic changes | Positive | No collapse |
| 3 | Crescent sign | Positive | Subchondral fracture, joint space preserved |
| 4 | Head flattening + DJD | Positive | Collapse + arthritis |
The crescent sign on plain radiograph marks the pivotal threshold — before the crescent sign, head-preserving surgery is feasible; after it, arthroplasty is typically required. — Miller's Review of Orthopaedics 9th Ed.
Surgical Options
1. Core Decompression (Stages 1–2, no crescent sign)
Mechanism: Drills a core channel through the femoral neck into the necrotic segment, relieving intraosseous pressure and stimulating vascular/bone neogenesis.
Indications:
- Pre-collapse stages (no crescent sign)
- Small lesion size (A: <15% head involvement)
- Younger patients (<40 years)
Contraindications / Poor prognostic factors:
- Chronic corticosteroid use (poor results)
- Medium/large lesions — high risk of eventual collapse despite decompression
"Core decompression relieves pressure buildup within the femoral head by the inflammatory process. Pressure relief translates to pain relief and stimulates a healing response — bone and vascular neogenesis." — Miller's Review of Orthopaedics 9th Ed.
2. Free Vascularized Fibular Grafting (Stages 2–3, medium/large lesions)
Mechanism: Necrotic segment is resected via a large core hole; a vascularized fibular strut is placed against the subchondral plate to prevent collapse. Microvascular anastomosis is performed with the lateral femoral circumflex artery. Adjacent bone is grafted with particulate autogenous bone.
Indications:
- Medium (B: 15–30%) and large (C: >30%) lesions
- Preferred without crescent sign; reasonable success with early crescent sign
- Younger patients
Complication: Flexor hallucis longus contracture is the most common.
3. Rotational Proximal Femoral Osteotomy
The necrotic segment is rotated out of the weight-bearing zone while maintaining hip function. Applicable in select younger patients but technically demanding and becoming less common.
4. Total Hip Arthroplasty (THA) — Stages 3–4
When crescent sign is present or head has already collapsed, THA is the recommended treatment regardless of age.
- Cementless cup and stem are preferred
- Advances in bearing technology (ceramic-on-ceramic, highly cross-linked polyethylene) have improved durability, making THA viable even in younger patients
- Provides good pain relief and functional outcomes
"Presence of crescent sign (impending subchondral collapse) or worse — THA is recommended treatment regardless of age." — Miller's Review of Orthopaedics 9th Ed.
Bilateral AVN — Special Considerations
Bilateral femoral head AVN is common (reported in corticosteroid use, sickle cell disease, alcoholism, dysbarism) and poses unique surgical challenges:
Staging each hip independently is essential — the two sides often present at different stages.
- Staging symmetry: If both hips are at the same stage (e.g., both Stage 2), head-preserving procedures can potentially be staged bilaterally (core decompression or fibular grafting on each side)
- Staged vs. simultaneous: Bilateral THA can be performed as simultaneous (both hips in one sitting) or staged (sequential operations). Simultaneous bilateral THA reduces total hospitalization time but carries higher perioperative risk (blood loss, VTE). Most centers now prefer staged bilateral THA with a 6–12 week interval
- Functional priority: The more symptomatic or more collapsed hip is typically addressed first
- Rehabilitation overlap: Bilateral procedures (even staged) have a significant impact on mobility and rehabilitation planning — patient must not bear full weight on a newly operated hip while the contralateral side is healing
"There has been bilateral avascular necrosis of the femoral heads, treated with a total hip replacement on the right." — Grainger & Allison's Diagnostic Radiology
Summary Algorithm
Bilateral AVN — Stage each hip independently
│
├── Pre-collapse (Stages 0–2, no crescent sign)
│ ├── Small lesion (<15%) → Core Decompression
│ └── Medium/Large lesion → Vascularized Fibular Graft
│
└── Collapse (Stage 3–4, crescent sign / head flattening)
└── Total Hip Arthroplasty (cementless)
├── Staged (preferred): 6–12 weeks between sides
└── Simultaneous: higher perioperative risk
Common Etiologies Driving Bilateral Presentation
| Cause | Notes |
|---|---|
| Corticosteroid use | Up to 30% of all hip AVN cases; bilateral very common |
| Alcoholism | Up to 40% of cases |
| Sickle cell disease | Bilateral involvement typical |
| Post-renal transplant | Up to 8% of recipients; falling with lower steroid protocols |
| Dysbarism (Caisson disease) | Bilateral decompression sickness injury |
Sources: Miller's Review of Orthopaedics 9th Ed. | Rockwood and Green's Fractures in Adults 10th Ed. | Textbook of Family Medicine 9th Ed. | Dermatology 5e (Bolognini)
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