Great question! Sacroiliitis — inflammation of the sacroiliac joints — can arise from two different pathways, and understanding the difference matters for how it's managed.
Mechanical (structural) sacroiliitis is driven by physical stress on the joint — think wear, strain, or instability. It tends to worsen with activity Show Full Answer
Great question! Sacroiliitis — inflammation of the sacroiliac joints — can arise from two different pathways, and understanding the difference matters for how it's managed.
Mechanical (structural) sacroiliitis is driven by physical stress on the joint — think wear, strain, or instability. It tends to worsen with activity and improve with rest.
Inflammatory (chemical) sacroiliitis, as seen in spondylitis, is driven by the immune system releasing chemicals like TNF, IL-6, and IL-17. This causes bone erosion, fluid buildup, and bone marrow edema (BME). A key tell: pain is *worse at rest or in the morning* and *improves with movement*. Historically, inflammatory sacroiliitis and spondylitis were considered predominantly a male condition. Research has shown that men tend to display:
- Higher disease activity scores
- More visible radiographic (X-ray) damage and progression
- More spinal involvement overall
However, more recent research has challenged this view. The prevalence of spondylitis is now understood to be similar between men and women — men were simply diagnosed more often, partly due to bias and partly because women can present differently (e.g., more peripheral joint and tendon pain rather than classic spinal symptoms).
So the historical "men's disease" label is being actively reconsidered as diagnostic awareness improves.
May 4
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