title: Postoperative complications in patients undergoing minimally invasive sacroiliac fusion.
abstract: Minimally invasive sacroiliac (SI) joint fusion has become increasingly relevant in recent years as a treatment for SI joint pathology. Previous studies have found minimally invasive SI fusion to be an effective and safe treatment option for chronic SI joint pain. However, these studies have been primarily single-center, case-based, or manufacturer-sponsored investigations, and as such their findings are limited to their sample populations.
  
  
  
  The aim of this study was to investigate the safety of minimally invasive SI fusion using a large nationwide sample group to more accurately identify complication rates of this increasingly popular procedure.
  
  
  
  This is a retrospective database study.
  
  
  
  The sample includes patients within the orthopedic subset of Humana database who underwent minimally invasive SI fusion between 2007 and 2014.
  
  
  
  Complications and novel lumbar and nerve pathology were the outcome measures.
  
  
  
  Patients undergoing minimally invasive SI fusion from 2007 to 2014 were identified using the Pearl Diver patient record database (Pearl Diver Technologies, West Conshohocken, PA, USA) from the nationwide private insurance provider Humana Inc. This approach provided access to records of over 18 million patients in every major geographic region of the country. Using the ICD-9 diagnosis codes (International Classification of Diseases 9th edition), data from patient records were analyzed to reveal incidence of postoperative infection, pain, osteomyelitis, joint derangement, urinary tract infection, and novel lumbar and nervous system pathology.
  
  
  
  Four hundred sixty-nine patients (305 female; 164 male) within the Humana insurance database received minimally invasive SI fusion between 2007 and 2014. Data from these patients showed a substantial increase in the use of the procedure over this 7-year period. Among these patients, an overall complication rate of 13.2% (n=62) was seen at 90 days postoperatively and 16.4% (n=77) at 6 months. The number of patients receiving a first time diagnosis of lumbar pathology following minimally invasive SI fusion in the sample population was also analyzed. The incidence of novel lumbar pathology in this population was 3.6% (n=17) at 90 days postoperatively and 5.3% (n=25) at 6 months. Men experienced diagnoses of novel lumbar pathology at higher rates than women within both 90 days (men=6.7%; women≤3.3%) and 6 months (men=9.1%; women≤3.3%) of the procedure (p<.01).
  
  
  
  The results of this study show that minimally invasive SI joint fusion could possibly carry higher risks of complications than previously stated. These findings are useful for physicians and patients when considering treatment for chronic SI joint pain.
authors.affiliation: Department of Orthopaedic Surgery, Keck School of Medicine, Elaine Stevely Hoffman Medical Research Center, University of Southern California, HMR 710, 2011 Zonal Ave, Los Angeles, CA 90033, USA.
authors.forename: Kyle
authors.initials: K
authors.lastname: Schoell
authors.affiliation: Department of Orthopaedic Surgery, Keck School of Medicine, Elaine Stevely Hoffman Medical Research Center, University of Southern California, HMR 710, 2011 Zonal Ave, Los Angeles, CA 90033, USA. Electronic address: zbuser@usc.edu.
authors.forename: Zorica
authors.initials: Z
authors.lastname: Buser
authors.affiliation: Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1520 San Pablo St., Suite 2000, Los Angeles, CA 90033, USA.
authors.forename: Andre
authors.initials: A
authors.lastname: Jakoi
authors.affiliation: Department of Neurological Surgery, Keck School of Medicine, University of Southern California, 1520 San Pablo St #3800, Los Angeles, CA 90033, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Pham
authors.affiliation: Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1520 San Pablo St., Suite 2000, Los Angeles, CA 90033, USA.
authors.forename: Neil N
authors.initials: NN
authors.lastname: Patel
authors.affiliation: Department of Neurological Surgery, Keck School of Medicine, University of Southern California, 1520 San Pablo St #3800, Los Angeles, CA 90033, USA.
authors.forename: Patrick C
authors.initials: PC
authors.lastname: Hsieh
authors.affiliation: Department of Neurological Surgery, Keck School of Medicine, University of Southern California, 1520 San Pablo St #3800, Los Angeles, CA 90033, USA.
authors.forename: John C
authors.initials: JC
authors.lastname: Liu
authors.affiliation: Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1520 San Pablo St., Suite 2000, Los Angeles, CA 90033, USA.
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects*; D011183:Postoperative Complications / Q000453:epidemiology*; D012446:Sacroiliac Joint / Q000601:surgery*; D013123:Spinal Fusion / Q000009:adverse effects*
keywords: Infection; Joint derangement; Minimally invasive surgery; Osteomyelitis; Pain; Sacroiliac joint fusion