What's the best way to test s1 joint dysfunction?

FABER: The faber test works great. When lying back, flex one leg at the thigh (flexion), move the leg outward, away from the body (abduction), and rotatete the thigh outward - the heel will rotate in and the toes will point out (external rotation). This will reproduce si joint pain.

No consensus: Many tests have been evaluated to see which has the best sensitivity and specificity for si joint pain. The faber is useful, as is ganselons and the gillet test. Tenderness right over the joint is also suggestive. Really, the big picture of the tests mentioned above plus the exclusion of other problems helps to solidify the diagnosis.