Avascular necrosis of the humeral head is known as?

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Avascular necrosis occurs when the blood supply to a bone is interrupted, leading to bone tissue death. When this process affects the humeral head, the condition is known as Hass disease. The humeral head relies on delicate arterial blood flow, so factors like trauma, dislocation, long-term steroid use, or chronic alcoholism can disrupt circulation and cause the bone to die and eventually collapse, producing shoulder pain and limited motion. Imaging may start with changes seen on MRI or bone scans showing edema or early necrosis, and progress to sclerosis, a crescent sign, and eventual flattening or collapse of the humeral head as arthritis develops. The other options refer to different conditions (for example, Kohler disease is avascular necrosis of the navicular bone in the foot; Monckeberg sclerosis involves calcification of arterial walls; atherosclerosis is broad arterial disease) and do not describe avascular necrosis of the humeral head.