Secondary avascular necrosis in coxarthrosis: a morphologic study

Area of Science:

• Orthopedics
• Pathology

Background:

• Osteoarthritis (OA) is a degenerative joint disease.
• Subarticular avascular necrosis (AVN) is a condition affecting bone tissue beneath cartilage.
• Secondary AVN can occur as a complication of other conditions.

Purpose of the Study:

• To investigate the prevalence and characteristics of secondary subarticular avascular necrosis in femoral heads from osteoarthritis patients.
• To compare the morphology of secondary AVN with primary AVN.

Main Methods:

• Gross examination of 82 surgically removed femoral heads from patients with osteoarthritis.
• Histopathological analysis to characterize the extent and depth of necrosis.

Main Results:

• Secondary subarticular avascular necrosis was identified in 11.7% of the examined femoral heads.
• Most cases presented with superficial necrosis.
• A subset (15%) exhibited deep, wedge-shaped necrosis, morphologically similar to primary subarticular AVN.
• Lesions were predominantly observed in early-stage osteoarthritis.

Conclusions:

• Secondary subarticular AVN is a notable finding in osteoarthritis femoral heads.
• The presence of deep, wedge-shaped necrosis suggests a potential shared etiology or mechanism with primary AVN.
• These necrotic lesions may impede the natural repair processes in early osteoarthritis, potentially influencing disease progression.