Which injury would most likely cause osteonecrosis?

Osteonecrosis, also known as avascular necrosis, refers to the death of bone tissue due to a lack of blood supply. This condition can occur in various scenarios, but the underlying cause is primarily insufficient blood flow to bone tissue.

The option highlighting insufficient blood supply directly correlates with the mechanism of osteonecrosis, emphasizing the need for adequate circulation to maintain the health of bone cells. When blood flow is compromised—whether due to trauma, pressure, or certain medical conditions—bone tissue becomes deprived of essential nutrients and oxygen, leading to cell death and decomposition of the bone architecture.

While fractures, torn ligaments, and dislocations can contribute to osteonecrosis in certain contexts, they do so typically through the indirect effect of compromising blood supply rather than being the sole factors leading to the condition. For optimal bone health, continuous and adequate blood flow is crucial, making insufficient blood supply the primary cause of osteonecrosis.