Cheung PWH, et al. - In this retrospective study of 235 consecutive patients who had undergone decompression-only surgery for lumbar spinal stenosis, researchers investigated how developmental spinal stenosis (DSS) influence the risk of re-operation at an adjacent level. Re-operation at an adjacent segment was done in 21.7%. In the multivariate regression model controlled for other confounders, DSS was identified as a poor prognostic indicator that can be identified prior to index decompression surgery. They identified 3.9 times higher likelihood to undergo future surgery at an adjacent level among patients with DSS who have undergone lumbar spinal decompression.