If you dive professionally or have done so for years, you already know that decompression sickness is not the only risk lurking under pressure. Dysbaric osteonecrosis (DON) — a form of avascular necrosis triggered by repeated hyperbaric exposure — develops silently in the bones of the shoulder or hip, often without symptoms until significant structural damage has already occurred.

Receiving a diagnosis of avascular necrosis (AVN) of the hip—also known as osteonecrosis of the femoral head—can feel like a sudden and silent betrayal by your own body. The primary bone in your hip joint, starved of blood, begins to suffer micro-fractures, initiating a cascade that can lead to joint collapse and severe osteoarthritis.