Systemic lupus erythematosus and avascular bone necrosis

Area of Science:

• Rheumatology
• Orthopedics
• Pathology

Background:

• Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with diverse clinical manifestations.
• Avascular bone necrosis (AVN) is a known complication of SLE, often linked to corticosteroid therapy.
• Understanding the precise triggers of AVN in SLE is crucial for patient management.

Observation:

• Two cases of SLE presenting with avascular bone necrosis are detailed.
• One patient exhibited extensive AVN affecting eight distinct anatomical sites, the most reported in a single SLE case.
• Both patients showed a significant increase in antinuclear factor (ANF) levels preceding new-onset necrosis symptoms.

Findings:

• The marked elevation of ANF at the onset of new necrotic areas suggests a direct link to SLE disease activity.
• Findings indicate that heightened autoimmune activity, rather than exogenous factors like steroid treatment, is the primary driver of AVN in these cases.
• The extensive involvement in one case highlights the potential severity and widespread impact of SLE-associated AVN.

Implications:

• This study suggests that monitoring SLE activity through biomarkers like ANF may help predict and potentially prevent AVN.
• The findings challenge the sole attribution of AVN to steroid therapy, emphasizing the role of underlying autoimmune processes.
• Clinical vigilance for AVN in SLE patients, particularly during periods of increased disease activity, is warranted.