Gaenslen's test Gaenslen's test is performed with the patient supine (on the back). The hip joint is maximally flexed on one side and the opposite hip joint is extended. This maneuver stresses both sacroiliac joints simultaneously.
Sacroiliac joints Grade 0 Normal Grade 1 Suspicious changes Grade 2 Minimal abnormality – small localized areas with erosion or sclerosis without alterations in joint width Grade 3 Unequivocal abnormality – moderate or advanced sacroiliitis with 1 of the following: erosions, sclerosis, widening, narrowing, or partial ankylosis Grade 4 Severe abnormality – total ankylosis
Reiter’s syndrome and Reactive arthritis (ReA)