title: Perioperative and Early Postoperative Comparison of a Modern Cemented and Cementless Total Knee Arthroplasty of the Same Design.
abstract: Cementless total knee arthroplasty (TKA) designs that incorporate a highly porous, titanium surface have the potential to achieve biologic fixation and improve component survivorship. This study's purpose was to compare perioperative and early postoperative outcomes of a cemented vs cementless TKA of the same design.
  
  
  
  This was a retrospective review of a consecutive series of TKAs performed at a single institution using a cemented or cementless TKA of the same design (Triathlon, Stryker Inc, Mahwah, NJ). All patients with a minimum of 1-year clinical and radiographic follow-up were reviewed, with 1:1 matching performed for age, gender, body mass index, and preoperative Oxford Knee Score. Chi-square or independent student t tests were used for statistical analyses.
  
  
  
  Overall, 62 cemented and 66 cementless TKAs were reviewed, with secondary analyses performed after 1:1 matching of 38 patients in each cohort. In both overall and secondary 1:1 matching analyses, there was no difference in baseline demographics (P = .6-.9). Total operative times were decreased in the cementless cohort (P = .03), but there was no difference in the estimated blood loss or change in hemoglobin levels (P = .2-.7). At a mean of 1.4 ± .5 years postoperatively, patients in both cohorts demonstrated similar improvements in Oxford Knee Scores and satisfaction scores (P = .2-.8), with no patients requiring a revision surgical procedure.
  
  
  
  A recently introduced cementless TKA design demonstrates excellent perioperative and early postoperative results without failures. Continued surveillance is necessary to elucidate the survivorship and potential long-term benefits of this cementless design.
authors.affiliation: Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois.
authors.forename: Denis
authors.initials: D
authors.lastname: Nam
authors.affiliation: Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
authors.forename: Judith E
authors.initials: JE
authors.lastname: Kopinski
authors.affiliation: Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Meyer
authors.affiliation: Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Rames
authors.affiliation: Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Nunley
authors.affiliation: Department of Orthopedic Surgery, Washington University School of Medicine/Barnes-Jewish Hospital, St. Louis, Missouri.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Barrack
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods* / Q000706:statistics & numerical data; D001843:Bone Cements; D005260:Female; D006801:Humans; D007720:Knee Prosthesis / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011475:Prosthesis Failure; D012086:Reoperation; D012189:Retrospective Studies; D014025:Titanium; D016896:Treatment Outcome
chemical_list: D001843:Bone Cements; D014025:Titanium
keywords: cemented; cementless; cruciate-retaining; outcomes; total knee arthroplasty