KOMPAS.com – Osteonecrosis or avascular necrosis is bone death caused by poor blood supply.
This condition is most common in the hips and shoulders, but can affect other large joints such as the knees, elbows, wrists, and ankles.
Osteonecrosis occurs when something blocks the flow of blood to bone tissue.
Bones are constantly changing as the skeletal system makes new bone tissue to replace aging bone tissue that eventually breaks down and dies.
This pattern needs to be done correctly so that the bones remain healthy and strong.
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Blood carries the nutrients and oxygen that bones need to stay healthy and regenerate.
Without blood flow, the skeletal system cannot make new bone tissue fast enough. As a result, the bones will “die”, begin to crumble, and eventually die.
Causes of osteonecrosis
Launch Medline Plus, Osteonecrosis can be caused by disease or severe trauma, such as a fracture or dislocation, which affects the blood supply to the bone.
Osteonecrosis can also occur without trauma or disease. This condition is called idiopathic, which means it occurs without a known cause.
The following are some possible causes of osteonecrosis:
- Using oral or intravenous steroids
- Excessive alcohol consumption
- Sickle cell disease
- Dislocations or fractures around the joint
- Freezing disorders
- HIV or taking HIV drugs
- Radiation therapy or chemotherapy
- Gaucher’s disease (a disease when harmful substances build up in certain organs and bones)
- Systemic lupus erythematosus (an autoimmune disease in which the body’s immune system mistakenly attacks healthy tissues such as the skin, joints, and certain organs)
- Legg-Calve-Perthes disease (childhood disease when the femur in the hip does not get enough blood, causing dead bone)
- Decompression sickness due to a lot of deep sea diving
Symptoms of osteonecrosis
Symptoms of osteonecrosis may not appear for weeks or months.
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However, over time, the following are the symptoms of osteonecrosis that may be experienced:
- Intermittent pain that appears and subsides when applying pressure to the bone
- Increased joint pain and stiffness
- Limited range of motion
- Lame if you have avascular necrosis in the hip or knee
- Difficulty climbing stairs, standing, or walking.
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