Comments on “Clinical classification criteria for neurogenic claudication caused by lumbar spinal stenosis. The N-CLASS criteria”

We read with great interest the article entitled "Clinical classification criteria for neurogenic claudication caused by lumbar spinal stenosis. The N-CLASS criteria" by Genevay et al. [1]. Although the results were very interesting, however, some methodological issues should be considered to avoid misinterpretation. The study [1] has suggested that the developed clinical classification criteria can be associated with neurogenic claudication (NC) caused by lumbar spinal stenosis (LSS). To us, the most important question is: Are the developed clinical classification criteria valid for the prediction of NC caused by LSS in independent dataset?

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