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The mean age at surgery was 67.4 \u00b1 10.1 years and 45% of patients were female. The 90-day reoperation rate was 4.7%, and 69.3% of the reoperations occurred within the first 30 days. The 90-day readmission rate was 7.2%. Multivariable analysis showed that postoperative development of a surgical site infection (SSI; odds ratio [OR] 14.09, 95% confidence interval [CI] 7.86\u201325.18), acute kidney injury (AKI; OR 6.76, 95% CI 2.39\u201319.57), and urinary tract infection (UTI; OR 3.96, 95% CI 2.43\u20136.37), as well as a history of congestive heart failure (CHF; OR 3.03, 95% CI 1.69\u20135.28), were significant risk factors for readmission within 90 days. Male sex (OR 0.60, 95% CI 0.38\u20130.92) was associated with decreased odds for readmission. With regards to reoperation, development of SSI (OR 25.06, 95% CI 13.54\u201346.51), sepsis (OR 7.63, 95% CI 1.52\u201340.59), UTI (OR 2.54, 95% CI 1.31\u20134.76), and increased length of stay (LOS; OR 1.25, 95% CI 1.17\u20131.33) were found to be significant risk factors. A subsequent analysis found that morbid obesity (OR 6.99), history of coronary artery disease (OR 2.263), increased duration of surgery (OR 1.004), and LOS (OR 1.07) were significant risk factors for developing an SSI.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>Overall, this study found rates of 4.7% and 7.2% for reoperation and readmission, respectively, within 90 days: 30.7% of the reoperations and 44.7% of the readmissions occurred beyond the first 30 days. A diagnosis of SSI, AKI, UTI, and history of CHF were significant factors for readmission, while male sex was associated with decreased odds for readmission. A diagnosis of SSI, sepsis, UTI, and increased LOS were found to be significant predictors for reoperation. Understanding 90-day complication rates is imperative because there has been increased discussion and healthcare policy extending the global postoperative window to 90 days. Current literature supports a readmission rate of 3%\u20139% after spine surgery. However, this literature either is limited to a 30-day window or does not stratify between different types of spine surgeries.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2019.1.spine18878","type":"journal-article","created":{"date-parts":[[2019,4,9]],"date-time":"2019-04-09T20:03:21Z","timestamp":1554840201000},"page":"20-26","source":"Crossref","is-referenced-by-count":32,"title":["Risk factors for 90-day reoperation and readmission after lumbar surgery for lumbar spinal stenosis"],"prefix":"10.3171","volume":"31","author":[{"given":"Haariss","family":"Ilyas","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery,"},{"name":"Center for Spine Health, and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joshua L.","family":"Golubovsky","sequence":"additional","affiliation":[{"name":"Center for Spine Health, and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingxiao","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Population and Quantitative Health Sciences, Case Western Reserve University, Cleveland, Ohio"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert D.","family":"Winkelman","sequence":"additional","affiliation":[{"name":"Center for Spine Health, and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas E.","family":"Mroz","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery,"},{"name":"Center for Spine Health, and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael P.","family":"Steinmetz","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery,"},{"name":"Department of Neurological Surgery, Cleveland Clinic; and"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1","series-title":"J Spinal Disord Tech","doi-asserted-by":"publisher","first-page":"E230","DOI":"10.1097\/BSD.0b013e31825c6f7b","article-title":"The difference of surgical site infection according to the methods of lumbar fusion surgery","volume":"25","author":"Ahn DK","year":"2012","unstructured":"Ahn DK, Park HS, Choi DJ, Kim TW, Chun TH, Yang JH, : The difference of surgical site infection according to the methods of lumbar fusion surgery. 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