Sacroiliitis: Causes of Back Pain

The sacrum in our is the structure in our spine that make up the base of our spine, and it is separated from the last lumbar vertebra (L5) by the L5-S1 intervertebral disc. The sacrum is held in position in the posterior portion of the pelvic cavity by the sacroiliac joints. The sacroiliac joints (SI Joints) are connected to the interior walls of the pelvis and the sacrum. Itis translated from Latin means inflammation. The medical term sacroiliitis describes inflammation is the sacroiliac joint, and the pain that results from this inflammation or dysfunction. Sacroiliitis is also known as Sacroiliac Joint Dysfunction. Typically, the inflammation of this portion of the spinal structure is caused by an inflammatory condition that affects the joints throughout the spine.

Sacroiliitis is a common symptom of a group of conditions, known as Spondyloarthropathies, that are caused by systemic diseases that cause arthritis of structures throughout the spine, among other medical problems in other parts of the body. Unlike osteoarthritis, these conditions aren't typically caused by wear and tear, but are more likely to be caused by systemic disease that involve an immune response of the body that results in the attacking of its own healthy joint tissues. This immune response, caused by the systemic disease, involve inflammation of the joints, or even the destruction of the joints. Some of the diseases classified as Spondyloarthropathies include Reactive Arthritis, psoriatic arthritis, ankylosing spondylitis, and Arthritis with inflammatory bowel disease.

Sacroiliitis may also be the result of osteoarthritis, Chrohn's disease, and ulcerative colitis.

The terms Sacroiliitis Sacroiliac Joint Dysfunction are sometimes used interchangeably, though there are some key differences between the two conditions.

Sacroiliac Joint Dysfunction is a condition where a person has pain in the region around the sacroiliac joint that results from abnormal motion. Pain may result from too much or too little motion of this joint. Too much motion of the joint is also known as "sacroiliac joint instability". Too little motion of the joint is known as "sacroiliac joint insufficiency". Sacroiliac joint instability may result from ligaments strains or a loosening of the ligaments that support the sacroiliac joint. Sacroiliac joint may result due to degeneration of the SI joint itself. Due to conditions such as osteoarthritis, the cartilage in the joint may wear out to the point that the joint locks, restricting its movement. Conditions such as infection, rheumatoid arthritis, and Spondyloarthropathies are more likely to cause sacroiliac joint insufficiency

. Sacroiliitis describes the condition of the inflammation of the sacroiliac joint. The inflammation may or may not be caused by SI joint dysfunction.

Sacroiliitis includes some combination of these symptoms:
  • Lower back pain
  • Pain in the lower back as well as pain in the upper leg, in front of the thigh, hips, and buttocks
  • Fever
  • Pain that worsens when rolling over in bed, and when sitting for prolonged periods of time
  • Stiffness experienced in the lower back and hips after extended periods of sitting or when getting up in the morning
Sacroiliitis Causes
Fall of Injury. As stated before, hard slips or falls may cause strain to the ligaments that support the SI joint. This stretching of the ligaments may destabilize the sacrum - causing it to tilt to one side. This sacroiliac joint instability may cause pain. To support the theory that sacroiliac joint instability often causes of lower back pain and Sacroiliitis, most people can trace the beginning of their pain symptoms to a traumatic fall or accident. HLA-B27 gene: TheHLA-B27 gene is found in most people with Spondyloarthropathies.