ibUtiOn License 4.0 (CCSY), which permits unresbicted use. dstnbutian, and reproduction in any medum. provided the original worn is properly cited. Medoine (2018)97:19(00667) %wired: 7? Apr' 2018/Accepted: 16 Apd 2018 tittp://dx.dolarg/10.1097/MD.0000000000010667 1. Introduction Degenerative lumbar s