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 Sacroiliitis is an inflammation of the sacroiliac (SI) joint that is associated with inflammatory arthritis of the spine. 

What exactly is the distinction between sacroiliitis and arthritis?

The inflammation of the SI joint, which is positioned on each side of the sacrum (lower spine) and connects the base of the spine to the hip bone, is referred to as sacroiliitis. 

  • The SI joint becomes inflamed as a result of trauma, infection, pregnancy, or arthritis. 
  • Sacroiliitis often causes a dull, aching discomfort in the lower back, buttocks, and legs that worsens when sitting for long periods of time and/or during activities that involve bending or twisting at the hip. 

Arthritis refers to a group of disorders that cause joint inflammation and damage. 

  •     The majority of these illnesses are classified as either degenerative arthritis (such as osteoarthritis,  or inflammatory arthritis (such as rheumatoid arthritis).
  •     Most varieties of arthritis cause dull and persistent pain with an insidious or slow onset, as well as joint stiffness and swelling.Arthritis refers to a group of disorders that cause joint inflammation and damage.

Is sacroiliitis a cause of arthritis?

Sacroiliitis is frequently associated with inflammatory arthritis of the spine, such as ankylosing spondylitis, psoriatic arthritis, and rheumatoid arthritis. Sacroiliitis is considered a sign of underlying arthritis in certain circumstances. 

However, sacroiliitis can arise on its own without being associated with another type of arthritis. 

The following are some of the most common non-arthritic causes of sacroiliitis:

  •     Large-scale trauma. Sacroiliitis can be caused by a fall or accident that causes damage to the pelvis or lower back.
  •     Trauma on a micro scale. Variations in how a person bends and mechanically navigates their environment can result in sacroiliac ligament micro-injuries.
  •     Overuse. Repetitive activity involving the lower back and pelvis, such as long-distance running or cycling, as well as manual labour that involves repetitive twisting, can put strain on the SI joints.
  •     Pregnancy. Because of the increased weight and pressure on the pelvis, the sacroiliac joint can become strained or inflamed during pregnancy, producing pain.
  •     Anomalies in gait. Walking or standing abnormalities might put extra strain on the SI joint(s) and produce inflammation. Long strides in a gait cycle might cause sacroiliac joint irritation. Leg length disparity is the most common cause of gait problems.
  •     Infection. A bacterial or viral infection can cause sacroiliitis in rare situations.

Prolonged inflammation of the SI joint can cause joint damage over time, increasing the chance of developing arthritis.

It’s crucial to remember that not all cases of sacroiliitis result in arthritis, and the progression of arthritis varies from person to person. Early detection and treatment of sacroiliitis can help prevent or reduce the progression of arthritis.

If you are experiencing symptoms of sacroiliitis or arthritis, it is critical that you consult with a physician who is trained in diagnosing and treating musculoskeletal pain. This will allow you to establish the underlying source of your symptoms and develop a treatment plan that is appropriate for you.


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