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What is Sacroiliitis and explain in detail?
Sacroiliitis is inflammation within the sacroiliac joint. It is a feature of spondyloarthropathies, such as axial spondyloarthritis (including ankylosing spondylitis), psoriatic arthritis, reactive arthritis or arthritis related to inflammatory bowel diseases, including ulcerative colitis or Crohns disease. It is also the most common presentation of arthritis from brucellosis.

Symptoms and signs
People suffering from sacroiliitis can often experience symptoms in a number of different ways, however it is commonly related to the amount of pressure that is put onto the sacroiliac joint. Sacroiliitis pain is typically axial, meaning that the location of the condition is also where the pain is occurring. Symptoms commonly include prolonged, inflammatory pain in the lower back region, hips or buttocks.However, in more severe cases, pain can become more radicular and manifest itself in seemingly unrelated areas of the body including the legs, groin and feet.Symptoms are typically aggravated by:
Transitioning from sitting to standing
Walking or standing for extended periods of time
Running
Climbing stairs
Taking long strides
Rolling over in bed
Bearing more weight on one leg

Cause
Sacroiliitis is a condition caused by inflammation within the sacroiliac joint. This joint is located where the base of the spine, known as the sacrum, and the pelvis, known as the ilium, intersect. "Itis" is a Latin term denoting inflammation.Since sacroiliitis can describe any type of inflammation found within the sacroiliac joint, there can be a number of issues that cause it. These include:
Degenerative arthritis, or osteoarthritis of the spine, can cause degeneration within the sacroiliac joints and lead to inflammation and joint pain.
Any form of spondyloarthropathies, which includes ankylosing spondylitis, psoriatic arthritis, reactive arthritis or arthritis related to inflammatory bowel diseases, including ulcerative colitis or Crohns disease.
Pregnancy can cause inflammation as a result of the widening and stretching of the sacroiliac joints to prepare for childbirth. Additionally, the added weight carried during childbearing can put an extra amount of stress on the SI joints, leading to abnormal wear.
Traumatic injury such as a fall or car crash that affects the lower back, hips, buttocks or legs.

Though rare, infection within the sacroiliac joints or another part of the body, such as a urinary tract infection, can cause inflammation.

Diagnosis
Sacroiliitis can be somewhat difficult to diagnose because the symptoms it manifests can also be caused by other, more common, conditions. If a physician suspects sacroiliitis, they will typically begin their diagnosis by performing a physical exam