title: Complication rate and implant survival for reverse shoulder arthroplasty versus total shoulder arthroplasty: results during the initial 2 years.
abstract: BACKGROUND
  The use of reverse total shoulder arthroplasty (RTSA) has significantly increased in recent years. However, there is large variance in reported complication rates and sparse data on implant survival. This study used a statewide patient database to investigate complication rates and implant survival for RTSA.
  
  
  METHODS
  All patients undergoing RTSA or total shoulder arthroplasty (TSA) from 2011 to 2013 were identified within a statewide database. The complication and revision rates at 30 days, 90 days, 1 year, and 2 years postoperatively were determined. Potential risk factors for complications were analyzed with logistic regression, and Kaplan-Meier survival curves were used to compare implant failure.
  
  
  RESULTS
  During the 3-year period, 10,844 procedures (6,658 TSA; 4,186 RTSA) were found within the database. The all-cause complication rate at 90 days and 2 years postoperatively was significantly higher for RTSA (P < .001). RTSA patients had a significantly increased risk of infection (P < .05) and dislocation (P < .001) in the early and midterm postoperative course. Workers' compensation, male sex, preoperative anemia, and those aged younger than 65 years had a significantly higher risk for complications (P < .001). Although RTSA initially had a higher rate of implant failure than TSA during the early postoperative period, this rate equalized at approximately the 1-year mark.
  
  
  CONCLUSIONS
  RTSA patients had significantly higher complication rates compared with TSA patients, with identifiable risk factors for all-cause complications postoperatively and equivalent accepted implant failure at 2 years.
  
  
  METHODS
  Level III; Cross Sectional Design; Large Database Analysis.
authors.affiliation: Keck School of Medicine at University of Southern California, Los Angeles, CA, USA.
authors.forename: Diego
authors.initials: D
authors.lastname: Villacis
authors.affiliation: Keck School of Medicine at University of Southern California, Los Angeles, CA, USA. Electronic address: sivasund@usc.edu.
authors.forename: Lakshmanan
authors.initials: L
authors.lastname: Sivasundaram
authors.affiliation: Keck School of Medicine at University of Southern California, Los Angeles, CA, USA.
authors.forename: William C
authors.initials: WC
authors.lastname: Pannell
authors.affiliation: Keck School of Medicine at University of Southern California, Los Angeles, CA, USA.
authors.forename: Nathanael
authors.initials: N
authors.lastname: Heckmann
authors.affiliation: Keck School of Medicine at University of Southern California, Los Angeles, CA, USA.
authors.forename: Reza
authors.initials: R
authors.lastname: Omid
authors.affiliation: Keck School of Medicine at University of Southern California, Los Angeles, CA, USA.
authors.forename: George F Rick
authors.initials: GF
authors.lastname: Hatch
mesh_terms: D000367:Age Factors; D000368:Aged; D000740:Anemia / Q000150:complications; D000072228:Arthroplasty, Replacement, Shoulder / Q000009:adverse effects* / Q000379:methods*; D002140:California / Q000453:epidemiology; D003430:Cross-Sectional Studies; D016208:Databases, Factual; D005260:Female; D006801:Humans; D007239:Infections / Q000453:epidemiology / Q000209:etiology; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology* / Q000209:etiology; D011475:Prosthesis Failure; D012189:Retrospective Studies; D012307:Risk Factors; D012737:Sex Factors; D012783:Shoulder Dislocation / Q000453:epidemiology / Q000209:etiology; D000072227:Shoulder Prosthesis / Q000009:adverse effects*; D015996:Survival Rate; D013997:Time Factors; D014942:Workers' Compensation
keywords: arthroplasty; complications; database; shoulder; statewide