title: Midterm clinical and radiographic results of the medial pivot total knee system.
abstract: OBJECTIVE
  The ADVANCE® Medial Pivot Knee System was designed with a highly congruent medial compartment and a less conforming lateral compartment to more closely mimic the kinematics of the normal knee. The purpose of this study was to evaluate the midterm clinical and radiographic outcomes of this total knee arthroplasty (TKA) system.
  
  
  METHODS
  Between January 1998 and December 2006, 421 primary TKAs were performed in 373 subjects using this system and a surgical technique that resects the posterior cruciate ligament. Of these, 365 TKAs in 320 subjects were available for a follow-up visit occurring at a mean of 5.3 years. Subjects were evaluated using Knee Society Scores, range of motion, and radiographic review.
  
  
  RESULTS
  The average Knee Society clinical score was 95.5 at final follow-up, with 358 (98%) TKAs having excellent or good results. Range of motion increased from a preoperative mean of 115 to 119° at final follow-up. Component survivorship, excluding revisions for infection or trauma, was 96.6% at five years.
  
  
  CONCLUSIONS
  This study demonstrates subjects implanted with the ADVANCE® Medial Pivot Knee System achieved satisfactory clinical and radiographic midterm outcomes.
authors.affiliation: The Texas Hip and Knee Center Foundation, 750 Eighth Avenue, Suite 400, Fort Worth, TX, 76104, USA, robert@rschmidtmd.com.
authors.forename: Robert
authors.initials: R
authors.lastname: Schmidt
authors.forename: Steven
authors.initials: S
authors.lastname: Ogden
authors.forename: J David
authors.initials: JD
authors.lastname: Blaha
authors.forename: Angelia
authors.initials: A
authors.lastname: Alexander
authors.forename: David A
authors.initials: DA
authors.lastname: Fitch
authors.forename: C Lowry
authors.initials: CL
authors.lastname: Barnes
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001696:Biomechanical Phenomena; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016119:Posterior Cruciate Ligament / Q000601:surgery*; D011183:Postoperative Complications; D011859:Radiography; D016059:Range of Motion, Articular; D016019:Survival Analysis; D016896:Treatment Outcome