Thank you very much for your interest in my above-mentioned article.
In the following, I answer your question:
Question: There was an obvious mistake in the paragraph one in the introduction section. The sentence “CSA < 100 cm2 is clinically diagnosed as LSS.” is wrong. Based on the original definition of CSA by Chiaki Hamanishi, we know that the unit of CSA is mm2 not cm2. We do believe that it is a clerical error of the author, but we also believe this kind of error should not exist in the scientific article.
Answer: I fully agree with your comment. This is a mistake. The correct unit of CSA is mm2.
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Ko, S. Answer to the Letter to the Editor of Y. Xu et al. concerning "Correlations between sedimentation sign, dural sac cross-sectional area, and clinical symptoms of degenerative lumbar spinal stenosis" by Sangbong Ko (Eur Spine J [2018] 27:1623–1628). Eur Spine J 28, 2426 (2019). https://doi.org/10.1007/s00586-019-06123-w
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DOI: https://doi.org/10.1007/s00586-019-06123-w