Lifestyle Changes in Avascular Necrosis (AVN)

1. Eliminate or Reduce Causative Agents

2. Weight Bearing Modification

• Modified weight bearing (protected weight bearing with crutches) is a cornerstone of conservative management, particularly in early/pre-collapse stages.
• Reducing load on the affected joint decreases mechanical stress on the compromised subchondral bone and may limit collapse.
• Non-weight bearing is specifically recommended once a tension-sided femoral neck stress fracture or early AVN is identified.

"Initial medical treatment is conservative and consists of trauma prevention, rest, and modified weight bearing with the use of crutches." — Dermatology 2-Volume Set 5e

3. Activity Modification

• Avoid high-impact activities (running, jumping, heavy lifting) that load the femoral head.
• Low-impact alternatives such as swimming, cycling, and aquatic therapy reduce joint loading while maintaining cardiovascular fitness and muscle strength.
• Physical therapy helps maintain range of motion and periarticular muscle strength, which can offload the joint.
• Avoid occupational or recreational exposure to dysbarism (compressed air environments / caisson disease), a known risk factor.

4. Manage Comorbidities

• Hyperlipidaemia: Elevated serum triglycerides and fat metabolism abnormalities are associated with AVN through fat emboli mechanism. A low-fat diet and lipid-lowering therapy (statins may also have a protective role) are relevant.
• Sickle cell disease / haemoglobinopathies: Optimise disease management (hydration, avoiding precipitants of sickling such as dehydration, cold, and hypoxia).
• HIV: Antiretroviral therapy adherence; some antiretrovirals are themselves associated with AVN.
• Weight management: Obesity increases mechanical load on weight-bearing joints and worsens outcomes; weight reduction through diet and low-impact exercise is beneficial.

5. Nutritional Support

• Adequate calcium and vitamin D intake supports bone health and may slow perilesional osteopenia.
• Balanced nutrition reduces fatty liver changes that are implicated in the fat-embolism theory of AVN.

6. Pharmacological Lifestyle Adjuncts

• Bisphosphonates: Controversial but used in pre-collapse AVN to prevent subchondral collapse. They are particularly relevant if corticosteroid use cannot be discontinued.
• Statins: May reduce risk of steroid-induced AVN through effects on lipid metabolism (mechanism: reducing fat cell enlargement in marrow).
• Anticoagulation: Considered when coagulopathy (protein C/S deficiency, elevated lipoprotein(a)) is an underlying cause.

Summary Table