Secondary avascular necrosis

Secondary avascular necrosis (also known as secondary osteonecrosis or secondary aseptic necrosis of bone) is a condition in which bone tissue dies due to a loss of blood supply, occurring as a consequence of an identifiable underlying cause or risk factor. Unlike primary (idiopathic) avascular necrosis, the secondary form is attributed to specific triggers such as prolonged corticosteroid use, excessive alcohol consumption, sickle cell disease, systemic lupus erythematosus, organ transplantation, radiation therapy, Gaucher disease, or other conditions that compromise vascular supply to bone. The femoral head (hip) is the most commonly affected site, though other bones such as the humeral head (shoulder), knee, and ankle can also be involved. The disease primarily affects the musculoskeletal system. Early stages may be asymptomatic, but as the condition progresses, patients typically experience increasing joint pain, stiffness, and reduced range of motion. Pain may initially occur only with weight-bearing activities but can progress to pain at rest. Without intervention, the affected bone may collapse, leading to secondary osteoarthritis and severe functional impairment. Diagnosis is typically made through imaging, with MRI being the most sensitive modality for early detection. Treatment depends on the stage of disease and the extent of bone involvement. Conservative approaches include pain management, protected weight-bearing, and addressing modifiable risk factors (such as reducing corticosteroid doses or alcohol cessation). Surgical options range from core decompression and bone grafting in early stages to total joint replacement in advanced cases with significant bone collapse. Pharmacological interventions such as bisphosphonates and anticoagulants have been investigated, though evidence for their efficacy remains limited. Early detection and intervention are critical to preserving joint function and delaying the need for joint replacement surgery.

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