2-stage treadmill test for lumbar spinal stenosis De Schepper et al. (2013) performed a systematic review on the diagnostic accuracy of tests used to diagnose lumbar spinal stenosis. They concluded that the diagnosis should be mainly based on patient history taking, while physical examination tests have not been found to be useful. However, a more recent systematic review by Cook et al. (2019) found that a couple of physical tests can actually be useful to confirm the diagnosis. One of them is t