Eur Spine J (2005) DOI 10.1007/s00586-005-0954-y
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Acknowledgement: The authors would specially like to thank the German Research Council (Deutsche Forschungsgemeinschaft, WI 1352/6-1) and the Deutsche Arthrose-Hilfe e.V. for financial support.
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The online version of the original article can be found at http://dx.doi.org/10.1007/s00586-005-0954-y
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Kettler, A., Wilke, HJ. Review of existing grading systems for cervical or lumbar disc and facet joint degeneration. Eur Spine J 15, 719 (2006). https://doi.org/10.1007/s00586-006-1077-9
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DOI: https://doi.org/10.1007/s00586-006-1077-9