Please choose the correct ending to complete the given sentence: Health: [header] How to prevent avascular necrosis [title] Manage the conditions that cause avn. [step] Preventing this condition requires treating the underlying conditions that cause it and managing the potential conditions from which it may arise. Generally, speaking avn is a result of thrombosis, emboli, or general bone fractures.

Ending1: In most cases, liposuction works to allow the avn to protect the skull's valves and to stop this mechanism from becoming clogged. Most avn patients become aware of the underlying causes when their blood vessels are present in order to keep their abdominal organs in better shape. Ending2: You can begin to help manage your condition by managing any underlying conditions that may have contributed to it. [substeps] To ensure that your avn treatment regimen is effective, raise your condition's scaliness. Ending3: [substeps] Thrombosis, and emboli mostly arise post-operatively, or after fractures and prolonged immobilization of fractured limbs. They both can be prevented by proper rehabilitation, and, if necessary, administration of anti-coagulant therapy, such as heparin. Ending4: Most buildings, streets, cars, and structures are situated in the initial stages of the disease, which are the first stage of the condition. Incubation periods vary from single to entire year to multiple years, so it's important to rule out other means of preventing avn from becoming a problem.

Answer format: ending1/ending2/ending3/ending4