Sacroiliitis is an inflammation of the sacroiliac joint, responsible for around 20–30% of lower back pain cases.
Often overlooked or confused with low back pain or sciatica, its origin is different:
it is a mechanical, joint-related pain, not a nerve-related one.
It typically presents in the sacral area and glute, sometimes radiating towards the groin or the back of the thigh, but rarely below the knee.
It is often very localised and worsens with asymmetrical movements (stairs, getting out of a car, turning in bed).
Common causes include:
– trauma or overload
– postural changes or pregnancy
– degenerative or inflammatory conditions
A simple self-check:
FABER test (figure-4 position). If pain is triggered in the sacral/glute area, the origin may be sacroiliac.
Recovery usually follows three phases:
reduce inflammation
stabilize the joint
restore movement
With a focus on:
✔︎ core strength
✔︎ motor control
✔︎ load management