title: Short-to-Midterm Outcomes of Revision Total Knee Arthroplasty Patients With a Total Stabilizer Knee System.
abstract: Revision total knee arthroplasty (TKA) can often be challenging. The use of a new revision system may aid in providing better stability, improved function, fit, and implant longevity. Therefore, we assessed: (1) survivorship, (2) clinical outcomes, (3) postoperative complications, and (4) radiographic outcomes of patients who underwent revision TKA using this system.
  
  
  
  Patients from 2 hospitals who underwent revision TKA using a newer generation revision knee system between June 2008 and December 2013 for component instability or aseptic loosening were included. There were 93 patients, who had a mean age of 65 years (range, 41-84 years), and a mean follow-up of 4 years (range, 2-7 years). Survivorship was assessed using Kaplan-Meier analysis. Radiographic analysis was performed using the new Knee Society Roentgenographic Evaluation and Scoring System.
  
  
  
  Aseptic survivorship was 96% (95% confidence interval, 6.6-7.3), and all-cause survivorship was 94% (95% confidence interval, 6.4-7.2). There were 2 infections and 4 aseptic loosening cases. The mean Knee Society score was 86 points (range, 38-100 points) and the mean functional Knee Society score was 52 points (range, 15-90 points) at final follow-up. The mean postoperative extension and flexion were 2° (range, 0°-20°) and 106° (range, 20°-130°), respectively. There were 3 medical and 11 surgical complications. Excluding the aseptic and septic failures, there were no progressive radiolucencies or osteolysis at final follow-up.
  
  
  
  At up to 7-year follow-up, this new revision system demonstrated excellent survivorship and good functional outcomes. Future studies should be prospective, comparative, and include larger cohorts for further assessment of this device.
authors.affiliation: Center for Joint Preservation and Replacement, Rubin Institute for Advanced Orthopedics, Sinai Hospital of Baltimore, Baltimore, Maryland.
authors.forename: Chukwuweike U
authors.initials: CU
authors.lastname: Gwam
authors.affiliation: Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio.
authors.forename: Morad
authors.initials: M
authors.lastname: Chughtai
authors.affiliation: Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio.
authors.forename: Anton
authors.initials: A
authors.lastname: Khlopas
authors.affiliation: Center for Joint Preservation and Replacement, Rubin Institute for Advanced Orthopedics, Sinai Hospital of Baltimore, Baltimore, Maryland.
authors.forename: Nequesha
authors.initials: N
authors.lastname: Mohamed
authors.affiliation: Department of Orthopaedic Surgery and Rehabilitation, University of Mississippi, Jackson, Mississippi.
authors.forename: Randa K
authors.initials: RK
authors.lastname: Elmallah
authors.affiliation: Department of Orthopaedic Surgery, University of Louisville, Louisville, Kentucky.
authors.forename: Arthur L
authors.initials: AL
authors.lastname: Malkani
authors.affiliation: Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Mont
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000295:instrumentation*; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D007720:Knee Prosthesis / Q000009:adverse effects / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology* / Q000209:etiology; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012086:Reoperation; D012189:Retrospective Studies; D014481:United States / Q000453:epidemiology
keywords: implant; midterm outcomes; outcomes; revision total knee arthroplasty; survivorship; total stabilizer knee system