Original Article: PDF OnlyPreoperative and Postoperative Instability in Lumbar Spinal StenosisJOHNSSON, KARL-ERIK MD*; REDLUND-JOHNELL, INGA MD†; UDÉN, ALF MD*; WILLNER, STIG MD*Author Information *From the Department of Orthopaedics, Malmo General Hospital, Lund University, Malmo, Sweden †From the Department of Diagnostic Radiology, Malmo General Hospital, Lund University, Malmo, Sweden Spine: June 1989 - Volume 14 - Issue 6 - p 591-593 Buy Abstract Sixty-one patients operated on for spinal stenosis, without a fusion, were studied retrospectively. Preoperative instability, as revealed by functional myelography, was found to predict a poor prognosis (P < 0.01). Women had less favorable results (P < 0.05). The “slipping” group was significantly more often radically decompressed than the “nonslipping” group (P < 0.01). Postoperative slipping was found in 26 patients, significantly more often in those with unsatisfactory results (P < 0.001). © Lippincott-Raven Publishers.