title: Comparative study of tibial posterior slope angle following cruciate-retaining total knee arthroplasty using one of three implants.
abstract: OBJECTIVE
  Pre- and postoperative tibial posterior slope angles (PSAs) were assessed in patients who underwent cruciate-retaining total knee arthroplasty (TKA).
  
  
  METHODS
  A total of 386 cruciate retaining TKA were performed in 308 patients and retrospectively reviewed. Based on the prostheses, 202 cases using NexGen were classified as group I, 120 cases using PFC sigma as group II, and 64 cases using Vanguard as group III. Postoperative PSA of groups I, II, and III were compared.
  
  
  RESULTS
  In groups I, II, and III, postoperative PSA was 6.0˚, 6.0˚, and 4.5˚, respectively (p < 0.001). Between preoperative measurement and final follow-up examination, mean knee score (59.7 to 97.3), function score (54.2 to 90.5), and range of motion (ROM; 126.7° to 132.2°) improved. These three values did not differ significantly among groups.
  
  
  CONCLUSIONS
  The 3° slope of the Vanguard polyethylene insert caused the difference in PSAs. This design characteristic should be considered when using this implant in TKA.
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University, Seoul, South Korea.
authors.forename: Dae Kyung
authors.initials: DK
authors.lastname: Bae
authors.forename: Sang Jun
authors.initials: SJ
authors.lastname: Song
authors.forename: Kyoung Ho
authors.initials: KH
authors.lastname: Yoon
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Noh
authors.forename: Seong Cheol
authors.initials: SC
authors.lastname: Moon
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000503:physiopathology / Q000601:surgery; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005271:Femur Head Necrosis / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery; D016119:Posterior Cruciate Ligament; D011859:Radiography; D016059:Range of Motion, Articular; D020127:Recovery of Function; D012189:Retrospective Studies; D013977:Tibia / Q000000981:diagnostic imaging / Q000473:pathology*; D016896:Treatment Outcome