The FABER Test Isn't That Valid

A positive FABER test does not incriminate just the hip & SI joints; it can be positive in the case of lumbar pathology as well. FABER stands for Flexion, ABduction, External Rotation. It's a test in which, in supine, the hip is placed in that position, like a figure 4. As with almost all orthopedic special tests (OSTs), I use the FABER as a baseline that informs my thinking — not as a test that tells me a diagnosis. 

Just like basic range of motion, strength, or the ability to do a functional activity can be a baseline, so can a test. The FABER test, after all, judges range of motion and its effect on symptoms. As we implement an intervention, we examine if and how baselines change. I know what I expect to see change for each specific diagnosis.

So if I note that FABER is positive on the left and/or right, the questions become: Is it relevant? And: Will it change? Based on that particular baseline and all the other information I’ve gathered (verbal and physical), we apply specific movements and assess the result. I know there's a strong chance lumbar procedures, hip procedures, and/or SIJ procedures can change the FABER test. -- Laura